For loop conditions..

If i have two loops, like this:
for (i=<;i <=5;i++){
     do something
     for(j =5; j<=5){
        if (something.equals(something[j]){
do something

for (i=1;i<=5;i++){
               kaart[i] = mast[rnd.nextInt(mast.length)] + " " + kaardid[rnd.nextInt(kaardid.length)];
               for (c = 1; c <=5; c++ ){
                    if (kaart.equalsIgnoreCase(kaart[c])){
                         String korduv = kaart[i];
                         System.out.println("Korduv kaart: "+korduv);
                         kaart[i] = mast[rnd.nextInt(4)] + " " + kaardid[rnd.nextInt(9)];
                    }//if- kontroll kas samasid kaarte on
                    c++;
               } //for-kontroll kas samasid on
               System.out.println(i + ". kaart: " + kaart[i]);
          }//for- jaga viis kaarti          Where do i add it?

Similar Messages

Less or less than equal in the for loop condition

Hi,
What do you prefer, what is more common, which one is more easily readable, less or less than equal in the for loop condition?
for (int i = 0; i < arr.lenght; i++){..}
//or
for (int i = 0; i <= arr.lenght - 1 ; i++){..}I know this is basic programming and nothing to do with Java, so if this forum is not for this purpose, could you please suggest a general programming forum?
I would really appreciate it as I have many general questions :)
Thanks in advance,
lemonboston

lemonboston wrote:
Hi,
What do you preferPersonal preference, which is useless to you
, what is more common,Based on years of reading open source code, the first
which one is more easily readable, less or less than equal in the for loop condition?Personal opinion, which is useless to you
I would really appreciate it as I have many general questions :)If you don't want to think about it yourself (which you should be doing in stead of asking general questions), simply attack it lazily. Both examples achieve exactly the same, but the first one is less to type and to read.

While loop and for loop condition terminal

Hello friends,
I am using labview 8.6. The condition terminal of the while loop and conditional for loop is behaving in just the opposite way.
When i wire a true to the condition terminal of my loop, the while loop continues to run when I click on run. when I wire a FALSE, it stops.
Is there any setting change that I have to make it to get it work properly.
Please suggest on this.
Thanks and regards,
Herok

Please do NOT attach .bmp images with the extension changed to .jpg to circumvent the forum filters!
Herok wrote:
I am sending you the VI. I am not sure if this would help you because only in 2 computers this behaviour is seen. In others, it works as it is supposed to work.
Whatever you are seeing must be due to some corruption or folding error. It all works fine here.
To make sure there are no hidden objects, simply press the cleanup button which would reveal any extra stuff (which is obviously not there). Does it fix itself if you click the termination terminal an even number of times? What if you remove the bad loop and create a new one?
Could it be you have some problems with the graphics card and the icon of the conditional terminal does not update correctly?
Whay happens if you connect a control instead of a diagram constant?
What is different on the computers where it acts incorrectly (different CPU (brand, model), #of cores, etc.)
LabVIEW Champion . Do more with less code and in less time .

Stopping output tasks properly before exiting a For-loop

Hi,
I've been having some trouble exiting a For-loop conditionally. The problem is that when the loop is stopped conditionally (a button is pressed) the DAQ (NI USB 6353) outputs get stuck to whatever value they were in. I tried stopping the DAQ Assistant output task (1 sample on demand) before exiting the loop but that didn't solve the problem. Should this perhaps be done one iteration before exiting the loop or can it be done in the same iteration round?
What would be the "right" way to exit a for loop with output tasks so that the output signals would be 0V after exiting? I know that I could "force" feed the DAQ Assistant with 0V control before exiting but in this case that would be quite difficult...
Any ideas? Help is appriciated.

Yes, I get it... However at this point I don't think that's an option.
Would this kind of solution work? ( I am not able to test all possible solutions in the real system which is why I would like to get a confirmation first)
The idea is to connect the output of the "Or" port to the "Stop" -ports of the DAQ Assistants in the loop.
Edit. Will the output automatically go to 0V if I just stop the task? I am not really sure about this.
Thank you.
Attachments:
exit-loop.jpg ‏8 KB

How to use i for if condition in a for i in loop?

Hi friends,
I have a question on how to use i for IF condition in a loop, in order to get an efficient programming and results. Here is outlined SQL:
cursor is
select c1,c2,c3 from table1; -- 100 rows returned.
open cursor
loop
fetch c1,c2,c3 into v1,v2,v3;
for i in 1..3 loop
if 'v'||i between 90 and 100 then
v_grade := 'Excellent';
elsif 'v'||i between 80 and 89 then
elsif 'v'||i between 50 and 59 then
end if;
end loop;
close cursor;
This way, I don't need to use a lot of if..then for hard code v1,v2,v3,.... actually I have more v..
But Oracle gave an error of this usage of 'if 'v'||i' or 'v'||to_char(i).
Thanks for any advice in advance!

user508774 wrote:
Thanks for comments and advices. But I didn't get your inputs clearly. Are you saying I don't need to use PL/SQL to achieve this?Correct. Ronel and John showed you the basic approaches. SQL is not a mere I/O language for making read and write calls. It is a very capable, flexible and powerful language. One can solve a problem with a few lines of SQL code, that will take 100's of lines of PL/SQL or Java code.
So do not underestimate what can be done in SQL.
v_cmd := 'UPDATE parts_categ_counts SET w1='||v1||', w2='||v2||...||v9||' WHERE seq='||vseq||';
EXECUTE IMMEDIATE v_cmd;This code is also wrong. Besides the fact that there is no need for dynamic SQL, this approach creates a brand new SQL statement each loop iteration.
SQL is source code. It needs to be parsed (compiled). The end result is an executable program that is called a cursor. This cursor needs to be stored in server memory (the SQL Shared Pool in the SGA).
The problem with your code is that it is slow and expensive - it generates lots of unique SQL statements that need CPU for parsing and server memory for storage.
These add up to a very significant performance overhead. That is the wrong approach. The correct approach is the same one that you would use in any other programming language.
Let's say you need to use Java to process a bunch of CSV files - exact same CSV layout used by each file. A file needs to be read, processed, and a log file created.
Will you write a Java program that loops through the files, for each file found, write a Java program for processing that file, compile it, then execute it?
Or would you write a Java program that takes the name of the file as input, and then process that file and writes the log file?
The 2nd approach provides a program that can process any of those CSV files - one simply needs to pass the filename as an input parameter.
Your code and approach use the 1st method. Not the 2nd. And that is why it is wrong.
To create a SQL program with parameters is done by using bind variables. Instead of
v_cmd := 'UPDATE parts_categ_counts SET w1='||v1||', w2='||v2||...||v9||' WHERE seq='||vseq||';
The following SQL source code should be created:
v_cmd := 'UPDATE parts_categ_counts SET w1=:v1, w2=:v2 ..., w9=:v9 WHERE seq= :vseq';
The tokens with the colon prefix (such as :v1), are bind variables. Think of these as the parameters to the SQL cursor.
The server parses this SQL into a cursor. You can now execute the same cursor over and over again, using different bind variables. (just like the 2nd approach above that one would use in Java)
In PL/SQL, this is made even easier as you can code native SQL code with PL/SQL code and use PL/SQL variables in it. The PL/SQL compiler is clever enough to do the SQL parsing, variable binding, and cursor execution for you. So in PL/SQL, you would use:
UPDATE parts_categ_counts SET w1=v1, w2=v2 ..., w9=v9 WHERE seq= vseq;
Where v1 and the others are PL/SQL variables.
That all said - PL/SQL is only used for data crunching, when the processing of data is too complex for the SQL language to deal with. And this is very seldom the case.
The main reason for using PL/SQL it to provide processing flow control, conditional processing and error handling, for SQL code. As the SQL language does not have these features.

About condition for loop in BPM

I design a loop, condition is counter<>3.
It seems only receives 3 messages when I send more than 3.
for example, I send 105 messages, for every 10 messages it will generate a file. and I totally have 11 files.
What is the best way to end the loop?

Hey,
       you need to have two loops in this.
       Have your send step(for the file) in the inner loop.
        The condition for this loop will be te number of messages that you need per file.
      The outer loop should terminate when all the messages are recieved.(recieve step will be in the outer loop)
   This is not possible with the no. of messages
You can do one thing, provide a stop message as an input along with the other messages.
And set the condition for the outer loop for the stop message.
This will terminate the outer loop.
regards,
        Milan

For loop initialization before another for loop commanded by an If condition

Hello Everybody,
I have made a program which sweeps the total range of the duty cycle of a command signal, for a MOSFET circuit. I use a for loop, and I measure the output power, find the maximum power and block my circuit at this value.
But I want that this loop serves as an initialization and I would like to add another For loop which starts with an If condition and sweeps a smaller part of the duty cycle. I have a voltage command, and I want that the second loop starts when the voltage command decreases.
So my question is about the structure to use? I can do it by using a formula node, but I need a very fast program. In fact, when the voltage command decreases, I need to find the maximum output power and to block my circuit at the value in 1s.
And in general, have you got advices to have a really fast program? (not use graph, tables,....?)
Thank you very much,
Anthony

NitinD wrote:
What are the contents of the Formula node?
That is the right question that I was also going to ask!!!
Also can you put a version of the code you already have here?
It will be easier to understand your needs with the code you have than with some literal description

I pull fiftyfour bytes of data from MicroProcessor's EEPROM using serial port. It works fine. I then send a request for 512 bytes and my "read" goes into loop condition, no bytes are delivered and system is lost

I pull fiftyfour bytes of data from MicroProcessor's EEPROM using serial port. It works fine. I then send a request for 512 bytes and my "read" goes into loop condition, no bytes are delivered and system is lost

Hello,
You mention that you send a string to the microprocessor that tells it how many bytes to send. Instead of requesting 512 bytes, try reading 10 times and only requesting about 50 bytes at a time.
If that doesn�t help, try directly communicating with your microprocessor through HyperTerminal. If you are not on a Windows system, please let me know. Also, if you are using an NI serial board instead of your computer�s serial port, let me know.
In Windows XP, go to Start, Programs, Accessories, Communications, and select HyperTerminal.
Enter a name for the connection and click OK.
In the next pop-up dialog, choose the COM port you are using to communicate with your device and click OK.
In the final pop
-up dialog, set the communication settings for communicating with your device.
Type the same commands you sent through LabVIEW and observe if you can receive the first 54 bytes you mention. Also observe if data is returned from your 512 byte request or if HyperTerminal just waits.
If you do not receive the 512 byte request through HyperTerminal, your microprocessor is unable to communicate with your computer at a low level. LabVIEW uses the same Windows DLLs as HyperTerminal for serial communication. Double check the instrument user manual for any additional information that may be necessary to communicate.
Please let me know the results from the above test in HyperTerminal. We can then proceed from there.
Grant M.
National Instruments

[svn:fx-trunk] 11530: Fix ASC-3790 ( conditional expression in for loop causes verifier error) r=jodyer

Revision: 11530
Author:   [email protected]
Date:     2009-11-06 13:23:05 -0800 (Fri, 06 Nov 2009)
Log Message:
Fix ASC-3790 (conditional expression in for loop causes verifier error) r=jodyer
Ticket Links:
    http://bugs.adobe.com/jira/browse/ASC-3790
Modified Paths:
    flex/sdk/trunk/modules/asc/src/java/macromedia/asc/parser/ConditionalExpressionNode.java

Bug in conditional for loop with an empty array

There appears to be a bug in the for loop with a conditional terminal.
If an empty array is wired to an auto-indexed array input tunnel, an output array tunnel has one element instead of zero.
The array constant on the left is empty.
Top loop without the conditional terminal produces an empty array.
The bottom loop with a never true conditional terminal produces an array with one element
Using LabVIEW version 8.5
Message Edited by TrevMrgn on 05-05-2009 02:01 PM
Solved!
Go to Solution.
Attachments:
For loop bug.png ‏3 KB

Creating the example from scratch, I do not see the error.
Neither do I.
If I add one or more elements to the array (constant or control), then delete them all (using 'Delete Element') the bottom array has one element.
Nup. Still empty.
If I empty the array (using 'Empty Array') both are empty.
Yep.
Also if I create an empty array using 'initialise array' with zero elements, I get one element.
Nup. Still empty.
'Show constant folding' does not appear to change the behaviour, but including a random operation in the loop does.
Agreed that constant folding doesn't cause any odd behaviour. Introducing a random operation (adding two constants) in the loop doesn't either.
I've tried all your methods here Trevor, but I can't replicate this behaviour in 8.5.1 under WinXP SP3. Sorry!
Maybe somebody else will be able to help, or find a useable workaround.
Thoric (CLA, CLED, CTD and LabVIEW Champion)

Cursor for loop gives less number of records for certain condition

Hi i am getting very weired behaviour of cursor for loop.
i have one query below which returns 128 records.
select su.item_id from suv_tmp su
inner join review_items ri on su.ITEM_ID = RI.ITEM_ID
inner join sources s on s.source_id=ri.source_id
and s.source_name='XYZ'
but when i take this query in cursor for loop it returns only 100 records.
this is the cursor for loop i am writing:
begin
for v_rec in
(select su.item_id from suv_tmp su
inner join review_items ri on su.ITEM_ID = RI.ITEM_ID
inner join sources s on s.source_id=ri.source_id
where s.source_name='XYZ'
loop
dbms_output.put_line(v_rec.item_id);
end loop;
end;
It prints only 100 records.
The weired behaviour is that if i select any column name from the table which is used in where clause it gives 128 records..
query below gives expected output
begin
for v_rec in
(select su.item_id,s.source_descr from suv_tmp su
inner join review_items ri on su.ITEM_ID = RI.ITEM_ID
inner join sources s on s.source_id=ri.source_id
where s.source_name='XYZ'
loop
dbms_output.put_line(v_rec.item_id);
end loop;
end;
i am not able to find out any logc..
Any pointers appreciated..
Edited by: user11266153 on Dec 14, 2011 11:27 PM

1) Can you provide the DDLs of those tables and dummy data to check if it gets reproduced at our env.
2) What is the Oracle Database software version? e.g. 9iR2 , 10gR1 , 10gR2 , 11gR1 etc...

For loop stop in sub vi from main vi?

Hi! I want to control from my main vi a sub vi consisting of a stepped sine function generator. This sub vi has a for loop. The problem is that I want to have the option of terminating the loop in the sub vi from the main vi. I tryed using global variables or an event stucture. The problem is that, in both cases, the "stop" variable in my main vi is only updated after the loop terminates in the sub vi. Can anyone please help me? Thank you very much.
Best regards,
Diogo Montalvão (Lisbon, Portugal)

hong2011 wrote:
I found this thread very helpful. May I ask one thing - what is the purpose of the Occurrence?? If I try it without implementing the Occurrence (neither in main VI or subVI), labview crashes when the subVI completes its task or is stopped from the mainVI.
A lot of things changed in the last 6 years, so this thread is a bit stale and there are a few other ways to do it. (For example we can have a FOR loop with a conditional terminal).
You don't provide enough information to answer your question why it crashes. It would be more interesting to know what you are "using" and not what you are "not using". This is not something we can guess by elimination.
LabVIEW should never crash, so please show us the code that crashes so NI can fix it. What LabVIEW version are you using?
LabVIEW Champion . Do more with less code and in less time .

How to code a parallel 'for loop' and 'while loop' where the while loop cannot terminate until the for loop has finished?? (queues also present)

I've attached a sample VI that I just cannot figure out how to get working the way that I want. I've labeled the some sections with black-on-yellow text boxes for clarity during the description that follows in the next few sentences. Here's what I want:
1) overall -- i'm intend for this to be a subVI that will do data acquisition and write the data to a file. I want it to use a producer/consumer approach. The producer construct is the 'parallel for loop' that runs an exact number of times depending on user input (which will come from the mainVI that is not included). For now I've wired a 1-D array w/ 2 elements as a test case. During the producer loop, the data is acquired and put into a queue to be delt with in the consumer loop (for now, i just add a random number to the queue).
2) the consumer construct is the 'parallel while loop'. It will dequeue elements and write them to a file. I want this to keep running continuously and parallel until two conditions are met.
      i. the for loop has finished execution
      ii. the queue is empty.
   when the conditions are met, the while loop will exit, close the queue, and the subVI will finish. (and return stuff to mainVI that i can deal with on my own)
Here's the problems.
1) in the "parallel for loop" I have a flat sequence structure.. I haven't had time to incorporate some data dependency into these two sequential sections, but basically, I just care that the "inner while loop" condition is met before the data is collected and queued. I think I can do this on my own, but if you have suggestions, I'm interested.
2) I can easily get the outer for and while loops to run sequentially, but I want them to run in parallel. My reasoning for this is that that I anticipate the two tasks taking very different amounts of time. .. basically, I want the while loop to just keep polling the queue to get everything out of it (or I suppose I could somehow use notifiers - suggestions welcome)... the thing is, this loop will probably run faster than the for loop, so just checking to see that the queue is empty will not work... I need to meet the additional condition that nothing else will be placed in the queue - and this condition is met when the for loop is complete. basically, I just can't figure out how to do this.
3) for now, I've placed a simple stop button in the 'parallel while loop', but I must be missing something fundamental here, because the stop button is totally unresponsive. i.e. - when I press it, it stays depressed, and nothing happens.
suggestions are totally welcome!
thanks,
-Z
Attachments:
daq01v1.vi ‏59 KB

I'd actually like to add a little more, since I thought about it a bit and I'm still not quite certain I understand the sequence of events...
altenbach wrote:
zskillz wrote:
So i read a bit more about the 'dequeue element' function, and as I understand it, since there is no timeout wired to the dequeue element function, it will wait forever, thus the race condition I suggested above can never happen!
Yes, you got it!
As I've thought about it a bit more, there's a few things that surprise me... first, the reason the 'dequeue element while loop' errors is not because there's nothing in the queue, it's becaues the queue has been released and it's trying to access that released queue... However the problem I have is this --- Even though there's no timeout wired to the dequeue element, I still would think that the while loop that contains it would continue to run at whatever pace it wanted -- and as i said before.. most of the time, it would find that there is nothing to dequeue, but once in a while, something is there. however, it seems that this loop only runs when something has been enqueued. the reason I say this is illustrated in the next code sample MODv2 that's attached below. I've added a stop button to the "queue size while loop" so the program runs until that is pressed. I've also added a simple conditional in the "dequeue while loop" that generates a random number if it a button is pressed... but this button is totally non-responsive... which means to me that the "dequeue while loop" isn't actually continuously running, but only when an element is added to the queue. this still seems almost like the 'dequeue while loop" waits for a notifier from the queue telling it to run. can you explain this to me? because it is different from what I expect to be happening.
rasputin wrote:
I tried to open your VIs but it doesn't work. LV
is launched, the dialog box (new, open, configure...) opens and then...
nothing. Not even an error message. I guess it isn't a problem of LV
version or a dialog box would appear saying this. Could you, please,
send a image of the code?
Thanks,
Hi Rasputin, I'm using LV8. I assume that was your problem, but who knows. I've attached a pic of of altenbach's solution since it's what I needed.
thanks
-Z
Message Edited by zskillz on 10-20-2006 11:49 AM
Attachments:
daq01v1MODv2.vi ‏63 KB
daq01v1MODpic.JPG ‏116 KB

How do i configure a FOR loop to have the behavior of the step Loop Type: Pass/Fail count?

Hello,
I'm using the Pass/Fail count set to one Pass to capture an event generated by my DUT. I originally used a numerical compare step with the Looping type of Pass/Fail count to accomplish this. Unfortunately the implementation changed and now I need to execute a few steps that can not be combined within one code module as before. Nor can these steps be put into a subroutine. One of the steps executes a .NET asembly and I haven't figured out how to pass the reference to the subroutine. When the subroutine is intered the reference is lost and the methode does not execute correctly.
I have an evaluation function the exits the loop when the expected conditions are met. Everything works except for the Overall Pass/Fail result of the For loop. If the loop exits due to the first numerical compare test passing, I want the loop overall execution to report as "Passed". If the loop reaches it's predetermined number of iterations, the overall result needs to report as "Failed". It would also be nice to have the radio button functionality of "Record Result of Each iteration". Some conditions require a wait over a minute for the event to occur and I don't want to generate needless data for the report.
Currently I get the pass/fail status for each For loop iteration, but only "Done" for each loop iteration. I don't want the initial few failures to cause the test to fail.
Does anyone know how to do this? Suggestions?
Thanks,

I have 2 steps in the loop that can not be combined into one step. This forces me to implement the behavior in some form of loop. A While Loop could be an option. I would need to pass the Step.Result.Status from the Multiple Numerical compaire step to the condition of the While Loop. I tried to use the Step.TS.ID without success. Some form of reference to the numerical compare step would be needed. I'm using a For Loop as I do want to limit the number of iterations of the loop. In the case where the loop iterations are reached, the event I am trying to detect did not occur at the correct time and a failure needs to be reported.
I came up with something based on my comments in the second post:
1) To start with I configured a Locals.ForLoop_5 variable. This is used to set the limit on the loop iterations and for comparison after the loop has finished executing. More on that later.
2) The first step inside the loop invokes a method within a .NET assembly that has been packed in a DLL This method gets the required data from the DUT and stores it to a text file.
3) The next step is the Multiple Numeric Limit step. This step invokes a VI that extracts the data from the text file. This step has been customized in several ways.
i) In Run Options, the Results Recording Option was disabled. This prevents recording of "Failed" while the loop executes when waiting for the event to happen.
ii) In Run Options, the Step Failure Causes Sequence Failure is unchecked. Same reasoning as i) These steps are not true failures.
iii) A Post Action is configured to go to the nexxt step after the For Loop End step On Condition True with the logic of Step.Result.Status == "Passed". This causes the loop to exit when the first "Passed" is encountered which corrolates with the event I'm trying to detect. On Conditon Fail remains set to default.
4) The step after the For Loop End is an expression step with everythin set to default except for the Status Expression logic set to: Locals.Loopindex < Locals.ForLoop_5 ? (Step.Result.Status = "Passed") : (Step.Result.Status = "Failed"). This step performs the overall Pass/Fail reporting for the For Loop. If the number of loop iterations is less than the maximum it could have only gotten there by the previous logic triggered by the numerical compare passing, therefore "Passed". If the loop index has reached the limit, then the event was not detected, therefore Failed.
I have tested this work around with success, it just a pain to now have to implement this on my 40 some odd For Loops.
If there is a better way, I'd still like to hear it.

How to make for loop pass only once in a next() method

Good Day!
Can anyone help me or suggest any idea to resolve my problem with the below code, wherein it will only pass the for loop only once. I already tried inserting the for loop in side the if (sqlset4.isFirst()) condition but the problem is it only retrieved the first row of the resultset.
Cheers!
               Statement sOutput = consrc.createStatement();
                        ResultSet sqlset4 = sOutput.executeQuery(xquery);
                        ResultSetMetaData rsMetaData = sqlset4.getMetaData();
                        int numberOfColumns = rsMetaData.getColumnCount();
                        String writefld = "";
                        while (sqlset4.next()) {
                             writefld = "";
                             for (int i = 1; i <= numberOfColumns; i++) {
                                 if (xxformatid.equals("1") || xxformatid.equals("3")) {
                                     writefld = writefld + "sqlset4.getString(" + i + ").trim()" + "|";
                            writefld = writefld.substring(0, writefld.length() - 1) + ")";
                            output.write("\r\n");
                            output.write(writefld);
                        output.close();I am using Netbean IDE 6.8
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi

Hi everyone!
What I actually trying to do is that I have a multiple tables and from these tables I'm going to write each of it into a flatfile that is a pipe delimeted that is why I have to make a loop to know how many fields I am going to write. The code that was attached are actually working, my only concern is that it will take a longer time of processing cause every record of a table it will pass to the for loop(checking how many column) wherein number of column/ were already known on the first loop.
Hi kajbj,
I think what your trying to explain is almost the same with below code which i had already tried. The problem with this is that the every loop of the outer loop data retrieve is only the data of the first record.
               Statement sOutput = consrc.createStatement();
                        ResultSet sqlset4 = sOutput.executeQuery(xquery);
                        ResultSetMetaData rsMetaData = sqlset4.getMetaData();
                        int numberOfColumns = rsMetaData.getColumnCount();
                        String writefld = "";
                        while (sqlset4.next()) {
                             writefld = "";
                             if (sqlset4.isFirst()) {
                                for (int i = 1; i <= numberOfColumns; i++) {
                                    if (xxformatid.equals("1") || xxformatid.equals("3")) {
                                        writefld = writefld + "sqlset4.getString(" + i + ").trim()" + "|";
                            writefld = writefld.substring(0, writefld.length() - 1) ;
                            output.write("\r\n");
                            output.write(writefld);
                        output.close();

For loop conditions..

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