Synchronisation of two for loops...

hii....
i am using two for loops and i want that each iteration for both for loops start at same time..
actually i want synchronisation between these two loops..
so when the each iteration of both loops will start at same time then these will be synchronised..
also if one loop take more time in one iteration then the other loop should pause until the other's iteration completes..
please hlp me...thanks...
thanks
do not hesitate to give kudos
Solved!
Go to Solution.

hiii
you are right thatthe loops will be synhronised as Labview executes code via data flow.
here i mean of synchronisation is that i want each iteration to be started at same time only...
this is what i am not getting..
i have tried it to b done by defining a local variable in one loop and using its value in the other but it did not work..
i hav tried some more methods but in vain...
so i am here...
thanks..
thanks
do not hesitate to give kudos

Similar Messages

How to pause and stop two "for loops" in an event

Hi
The main menu runs first and then goes to reading menu. After "Start Reading" button is pressed, the reading process will take readings.
1) During reading process, if the "Pause Reading" button is pressed, I want that the two "for loops" are stopped and the two "for loop" counters do not reset. After the "Start Reading" button is pressed, the two "for loops" will continue to run.
2) During reading process, if the "Stop Reading" button is pressed, I want that the two "for loops" are stopped and the two "for loop" counters are reset. After the "Start Reading" button is pressed, the two "for loops" will run again.
The attached two VIs are simplified my real application. Any help will be appreciated.
Thanks
Steve
Attachments:
Main Menu Test.vi ‏9 KB
Reading Menu Test.vi ‏23 KB

You can't have those loops inside of the event structure. Currently, when you press the start button, the reading has to finish before the event case finishes. This will prevent the stop can cancel buttons from being processed by the event structure.
You need another loop that can recieve commands from the event loop. Look up the Queued Message Handler. That should get you a good start on the command process.
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How to build a table with two For Loop

Hi,
I have two Loop For and I want to build a table with N columm (N = a loop + b loop)
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help_table.zip ‏10 KB

I think this is the solution that you are going for.
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How do i sweep two voltage at the same time by using for loop ?

Hello, Can anyone help me on this topic ?
My problem is to sweep Vds and Vgs as same time vs Id in MOSFET by using for loop. I also use the Agilent power supply source. Let me tell a litle bit about what i'm doing. For different value of Vds, i will get Vgs vs Id curve. (The x axis is Vgs, the y-axis is Id).
I started to create two for-loop, the inner to sweep Vgs, and the outer one to sweep Vds. My problem is don't know how to connect all the wire in the for loop.
In the for loop i saw N, i icon. Suppose I have the two variable for Vgs such as Vgs start and Vgs_stop. Should the Vgs_start( or Vgs_stop) be connected to N or leave it in the for_loop ?
for example: I want to sweep Vgs from 0(for Vgs_start) to 5(Vgs_strop) V, and the step increment is .5V how do i connect these variables in the for loop ?
Thank you for your time
Ti Nguyen

It is easier to use a while loop. Dennis beat me to the punch. Here is my solution:
You can remove the flat sequence structure if you use Error In and Error Out to ensure the execution flow will occur in the proper order. Be sure to include the delay time in the loop so that your vi doesn't hog all the CPU time.
Message Edited by tbob on 10-17-2005 01:00 PM
- tbob
Inventor of the WORM Global
Attachments:
RampVoltage.PNG ‏8 KB

How do u create a 2-dim. vector with a for loop(two for's) ?

JTable is such a pain in the ass sometimes... you see i don't have a predifined number of elements to be stored in the JTable... so i have to pass a Vector[][] but i don't know how to create one in two for loops...
Vector v[][] = new Vector[][];
for(int i = 0; i< v.size(); i++){
for (int j=0; j<v.size(); j++){
v[i][j] = { "" + (u+1) , ((Team)c.get(array[u])).getName()),
intoString(((Team)c.get(array.getPlayed()))),
intoString(((Team)c.get(array[u].getHomeWins()))),
intoString(((Team)c.get(array[u])).getHomeDraws()),
intoString(((Team)c.get(array[u])).getHomeLosses()),
intoString(((Team)c.get(array[u])).getHomeFor()),
intoString(((Team)c.get(array[u])).getHomeAgainst()),
intoString(((Team)c.get(array[u])).getAwayWins()),
intoString(((Team)c.get(array[u])).getAwayDraws()),
intoString(((Team)c.get(array[u])).getAwayLosses()),
intoString(((Team)c.get(array[u])).getAwayFor()),
intoString(((Team)c.get(array[u])).getAwayAgainst()) ,
intoString(((Team)c.get(array[u])).getPoints()) } ;
It doesnt work this way because my layout in JTable later needs to be like this....
uuuuuu uuuuuuuuuuuuuu uuuuuuuuuuuu uuuuuuuuuu
666666 66666666666666 666666666666 6666666666
777777 77777777777777 77777777777 7777777
.. and so and so... do u follow me ??
Please help me if you can ....

I might still be mising the point but here goes.
According to the API ( http://java.sun.com/j2se/1.3/docs/api/index.html ) for JTable, the appropriate constructor is:
public JTable(Vector rowData, Vector columnNames)
I'm assuming that the JTable should have one column for each of the items - Name, Played, HomeWins etc. I'll also assume there is an array of Team objects containing the data (if I'm wrong the code should be easy to adjust).
The columnnames Vector is self-explanatory - add a String object for each column.
For rowData, you need a Vector of Vectors.
e.g
Vector rowData = new Vector[teamArray.length];
for (int k = 0; k < teamArray.length; k ++) {
Vector oneRow = new Vector();
Team team = teamArray[k];
oneRow.add(team.getName());
oneRow.add(team.getPlayed());
oneRow.add(team.getPoints());
rowData[k] = oneRow;
JTable table = new JTable(rowData, columnNames);

How to pass the sequence number of current loop in a for loop in FPGA vi to the host

PCI-7830R
LV 8.2
What I was trying to do is to use multiple DIO to generate pulse at different sequence. Mode one is to automatically sweep from DIO1 to DIO20; mode 2 is several DIOs generate pulse simoutaneously. So I use a case structure to make the selection, in the mean time, I set up two for loop in each case so that I can use multiple pulse generations. For example, in scanning mode, if I set 2 exposures, it sweeps from 1 to 20 then do it again.
Then I need to get the loop sequence number, i of each scenario. So I put an indicator within the first loop, and create a local variable of it and put in the second one. Running the FPGA vi alone, I can see the indicator change in each case from 0 to N-1, N being the for loop time.But in the host vi, I tried to add this indicator as an element in the read/write invoke method, in the debugging mode, I could only see it directly jump to N-1 without all the changes I saw in FPGA vi.
Is it possible to get this number passed correctly from FPGA vi to the host vi? Thanks

Thanks for the reply Jared.
Excuse me if it looks incorrect, but I'm new to FPGA programming, so I would have to look into the FIFO you referred to. I used local variables because for one thing I have several different cases containing for loop in each of them, and I only want one indicator for the "i". If I put the indicator out of any for loop, it's only gonna show the last number which is N-1. For the other thing, it seems like property nodes are not allowed in FPGA vi. And by doing this, I can see the i number changing from 0 to N-1 in each case, well, in FPGA vi's front panel. But while I ran the host vi with everything, the indicator in host vi's front panel only showed the last number N-1. It may be the reason you said, it happened too fast before the indicator in host vi can catch it.
What I want to realize is to group the data I collect in host vi, for example, when I choose multiple exposure in each mode, and the FPGA runs 1 through 20 then do it again, I want the data stored in two groups using the loop sequence number as the seperator in file name. So it goes like 1-1, 2-1.......20-1; then 1-2, 2-2,.....20-2.

Visa open and close with "for loops"

Hello everyone
In my program I used two "for loops" which include visa write and read for a RS32 port. it is not possible to close a devise with visa close as the out put is changed to 2D array!!! would you please help me with this error
Attachments:
ACU_232.png ‏108 KB

sam009 wrote:
Thanks for reply,
It works for "for loop" but what about "event structure loop" still is error for that.
Right-click on the output tunnel and uncheck "Use Default if Unwired". You will now be forced to wire the VISA Resource through each case.
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How to use for loops with Multiple Initializers and Incrementers

I found that my for loop is printing out wrong, because I am using two for loops. I have searched but all I can find out is you can't use multiple inializers and increments, does anyone know how to get around this? How would I use an array for this?
Thanks very much for your help.
import java.util.Random;
import java.util.Arrays;
/** Generate numnodes value for random integers in the range 0..499. */
public final class RandomInteger {
public static final void main(String... aArgs){
log("Generating 6 random integers in range 0..499.");
int numnodes = 6;
//Randomly generate a number between 0 and 499 for the x and y coordinates for the nodes
Random randomGenerator = new Random();
for (int x = 0; x < numnodes; ++x) {
int randomInt = randomGenerator.nextInt(500);
Random randomGenerator2 = new Random();
for (int y = 0;y < numnodes; ++y) {
int randomInt2 = randomGenerator2.nextInt(500);
log("Generated : " + randomInt + " " + randomInt2);
log("Done.");
}

Sorry that code works, but I want to use both my x and y coordinates to get a random number from 0 to 499 in both of them, then I want to do some comparisons of the values, then return it to another function. As it stands now, I get the wrong results when I run it, as you can see at the bottom.
Thanks very much for your help. I have been stumped all mornign on this and have looked everywhere trying to find an example. I don't won't to use math random. I am on a tight deadline to finish and at the rate I am going, I will not complete it.
/** Generate numnodes value for random integers in
the range 0..499. */
public final class RandomInteger {
public static final void main(String... aArgs){
log("Generating 6 random integers in range
0..499.");
int numnodes = 6;
//Randomly generate a number between 0 and 499 for
the x and y coordinates for the nodes
Random randomGenerator = new Random();
for (int x = 0; x < numnodes; ++x) {
int randomInt = randomGenerator.nextInt(500);
Random randomGenerator2 = new Random();
for (int y = 0;y < numnodes; ++y) {
int randomInt2 = randomGenerator2.nextInt(500);
log("Generated : " + randomInt + " " + randomInt2);
log("Done.");
private static void log(String aMessage){
System.out.println(aMessage);
Output:
--------------------Configuration:
<Default>--------------------
Generating 6 random integers in range 0..499.
Generated : 98 254
Generated : 98 347
Generated : 98 359
Generated : 98 25
Generated : 98 277
Generated : 98 148
Generated : 416 401
Generated : 416 165
Generated : 416 354
Generated : 416 169
Generated : 416 144
Generated : 416 354
Generated : 295 158
Generated : 295 138
Generated : 295 349
Generated : 295 324
Generated : 295 18
Generated : 295 193
Generated : 197 451
Generated : 197 416
Generated : 197 480
Generated : 197 33
Generated : 197 490
Generated : 197 494
Generated : 324 412
Generated : 324 490
Generated : 324 213
Generated : 324 386
Generated : 324 467
Generated : 324 163
Generated : 379 180
Generated : 379 446
Generated : 379 314
Generated : 379 52
Generated : 379 113
Generated : 379 271
Done.
Process completed.

How to pass parameter into cursor for loop ?

Hi Experts,
I want to pass parameter l_bom_header_tbl(i).assembly_item_name into the for statement below How to achieve this?
for j in 1 .. l_bom_components_tbl.COUNT LOOP
Thanks

Maybe i failed to describe in detail,so here i go:
I have two for loops:
for i in 1 .. l_bom_header_tbl.COUNT LOOP --1st For Loop
V_bom_header_tbl.organization_code :='DSC';
V_bom_header_tbl.assembly_item_name:= l_bom_header_tbl(i).assembly_item_name ;
k:=1;
I want to pass parameter l_bom_header_tbl(i).assembly_item_name into the for statement below: How to achieve this?
for j in 1 .. l_bom_components_tbl.COUNT LOOP *2nd For Loop*
v_bom_components_tbl(k).Assembly_Item_name := l_bom_header_tbl(i).assembly_item_name ;
k := k + 1;
end LOOP;
end loop;
end;
I want to pass a paramter into second for loop in such a way that it accepts from the first for loop
for j in 1 .. l_bom_components_tbl.COUNT LOOP -2nd loop
Edited by: ILovePlSql on Mar 22, 2010 12:25 PM

Question about for-loop

I have a for-loop problem:
I want to write a two for-loops to produce this below output
100
200 205
300 305 310
400 405 410 415
500 505 510 515 520
600 605 610 615 620 625
700 705 710 715 720 725 730
800 805 810 815 820 825 830 835Anyone has some idea, i seem to get stuck!

vichet wrote:
Yeah, you all are right! it's my homework.
It looks kinda easy. but at the previous moment, I could not get it to solved.but you did. Good deal!
By the way, do you have any idea on how I can learn to improve my skill to solve such problem quickly? It seems to take me long to solve this problem. and I am worried that it might take me long to write code later on as my brain does not seem to be robust :(Yep, practice, practice, practice. Try to stretch yourself. There are problems posted here every day, so why not try to figure them out?

Quick for loop question

Hi everybody,
I have a feeling this is so obvious that I'm missing it, so if anyone would give me some advice, I'd appreciate it.
I have a method with with three parameters that loops through them and progressively adds or subtracts them with a for loop, based on the order. The only way I can think of to do this, though, is with two for loops with almost identical code. I know there must be an easier way to do this, but I think I've been staring at it too long, can anyone give me a hand conceptually, please?
The method is:
private void create( int param1, int param2 ) {
        int entries = 5;
        double increment;
        if( param1 > param2 ) {
            increment = param1 - param2;
            for( int i = 0; i < entries; i++ ) {
                System.out.println( param1 - ( i * increment ) );
        } else if( param2 > param1 ) {
            increment = param2 - param1;
            for( int i = 0; i < entries; i++ ) {
                System.out.println( param1 + ( i * increment ) );
     }Thanks,
Jezzica85
Edited by: jezzica85 on Mar 30, 2009 2:38 PM

private void create( int param1, int param2 ) {
    if( param1 > param2 ) {
        create(param2, param1);
    } else if( param2 > param1 ) {
        int entries = 5;
        double increment = param2 - param1;
        for(int i = 0; i < entries; i++ ) {
            System.out.println( param2 + (i * param1));
    } //equal do nothing?
}or
private void create2( int param1, int param2 ) {
    if (param1 != param2) {
        int entries = 5;
        int minParam = Math.min(param1, param2);
        int maxParam = Math.max(param1, param2);
        double increment = maxParam - minParam;
        for( int i = 0; i < entries; i++ ) {
            System.out.println( maxParam - (i * minParam));
}

What is the best way to pass a controlling signal out of a sub vi or more than one layer of for loop, while the sub vi or for loops are still running?

I have a vi that runs through two for loops and a while loop, then after a certain number of iterations on the inner while loop it is supposed to pass a trigger to a case stucture to start measurement. I have tried using a local variable attached to a boolean control which in turn is attached to the true case of the case structure involving the measurement sub vi. What is happening is that the boolean control will light on the front panel at the correct # of iterations in the while loop, as if true, but the measurement is not taken, and the boolean control never goes back to false. It remains lit. Am I u
sing the local variable incorrectly? If so, where am I going wrong.
Attachments:
GL_Flicker.vi ‏118 KB
Take_Measurements.vi ‏147 KB

Hello planar,
There are multiple ways to pass control information between loops and VIs and each one has its place. For simple VIs like your example, a local variable will be fine.
The main reason the subVI is not running is that the case structure is not continuously polling the Boolean control. This is because the case structure is not inside a loop and as such will only read the Boolean value once and execute once. Encasing the case structure and control inside the while loop should solve the issue of the subVI not running.
You may find the following links of help in creating more robust and advanced VI architectures.
Application Design Patter
ns: Master/Slave
LabVIEW Application Design Patterns
Keep up to date on the latest PXI news at twitter.com/pxi

Making 2 for loops without nested

How to make two for loops without nested like the follwoing
for i in 1.10, j in 1..30 loop
end loop
Please help me

Following is the closest I could think of...
SQL> ed
Wrote file afiedt.buf
1 declare
2 type myrec is record (ctr1 number, ctr2 number);
3 type tabrec is table of myrec ;
4 v_tabrec tabrec := new tabrec();
5 begin
6 for i in 1..10 loop
7 v_tabrec.extend;
8 v_tabrec(i).ctr1 := i;
9 v_tabrec(i).ctr2 := i;
10 end loop;
11 for i in 11..30 loop
12 v_tabrec.extend;
13 v_tabrec(i).ctr2 := i;
14 end loop;
15 for i in v_tabrec.first..v_tabrec.last loop
16 dbms_output.put_line(v_tabrec(i).ctr1 || v_tabrec(i).ctr2);
17 end loop;
18* end;
SQL> /
11
22
33
44
55
66
77
88
99
1010
11
12
13
14
15
16
17
18
19
20
21
22
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30

Stopping a For Loop, part 2

Hello. Thank you everyone for your help, getting to this point. I asked for help to create a stop condition, while a For Loop is running. I was given many ideas and selected the one that used local variables. It works well however, if I am in the "Test in progress" state, in the first For Loop, and the "Stop" button is selected from the front panel, when it stops the Vi, it sends the value "5" to the second For Loop before going to the "End" state, which puts it to "0", then stops the Vi. What this Vi is doing is feeding 0-200VDC signal to an eddy current sensor, then it feeds 200-0VDC going the other direction. I have tried sequencing, putting in timers and a few other goofy things but I can not get the Vi to stop in the first For Loop, without the Vi performing the initial "5" to the second For Loop. Someone had mentioned using an event handler, in my previous post. I practiced for quite some time, trying to understand how to use an event handler but am not much the wiser. Any and all input would be greatly appreciated.

altenbach wrote:
ceilingwalker wrote:
You are autoindexing way too many thing between the two FOR loops I was doing this to create a data dependency, at least that was my thought process behind it. As far as the physical channels and VISA refnums, I did it this way so I didn't create more controls for the front panel. Being my first project, I am very certain my logic is flawed, this is why I like posting here and getting feedback from
You have many visa sessions that (hopefully) never change during the execution of the loops, so why woold you turn them into an array of 11 identical elements just to autoidex them out again at the next loop. Change the tunnels to no autoindexing and things would look cleaner. Why are these session controls inside the loop? Are you expect them to be changeable during loop execution or would that screw up the results?
Wounld't it be easier to simply create an up&down ramp once and use a single FOR loop, autoindexing on the ramp? You have way too much duplicate code!!!
If you don't want the second loop to run when the first one is ended prematurely with the stop button, put it in a case structure I tried a Case structure for the second For Loop. I couldn't find a way to change conditions that didn't affect the Vi's overall performance.
Then show us what you tried! That should be trivial to implement. Why would a case structure affect performance? Makes no sense!
Why would a case structure affect performance? Makes no sense! I used a boolean operator to change the state. When I used a false, it worked for that problem but shut down my Vi before the second For Loop.
Wounld't it be easier to simply create an up&down ramp once and use a single FOR loop, autoindexing on the ramp? You have way too much duplicate code!!! I tried using one For Loop to begin with but because I had to ramp up, then ramp down, I couldn't figure out how to use just one. I needed an Add function for the ramp up and a Subtract function for the ramp down.
Why are these session controls inside the loop? Are you expect them to be changeable during loop execution or would that screw up the results? No Sir, the values are not changed during operation. I did this because I wanted it to display the data on the front panel, during operation of the Vi. For display only.

How to check two contitions in for loop

Hello all
Here I am having a for loop where I am reading from a cursor and I want to run this loop
till the number in :P102_NO
FOR emp_rec in emp_cur and i in 1 to :P102_NO loop
insert into EMP(EMP_ID,DEATH_DATE) values(emp_rec.emp_id,:P102_DATE)
end loop;
but it is showing a error:
ORA-06550: line 5, column 24: PLS-00103: Encountered the symbol "AND" when expecting one of the following: . ( * @ % & - + / at loop mod remainder rem .. || multiset
do anybody have any idea about it?
Thanks
Tauceef

Tauceef wrote:
Hello all
Here I am having a for loop where I am reading from a cursor and I want to run this loop
till the number in :P102_NO
FOR emp_rec in emp_cur and i in 1 to :P102_NO loop
insert into EMP(EMP_ID,DEATH_DATE) values(emp_rec.emp_id,:P102_DATE)
end loop;
but it is showing a error:
ORA-06550: line 5, column 24: PLS-00103: Encountered the symbol "AND" when expecting one of the following: . ( * @ % & - + / at loop mod remainder rem .. || multiset
do anybody have any idea about it?
Thanks
TauceefYou would need 2 loops, but the ideal way to do this would be in a single SQL statement... no loops, no cursors.
FOR emp_rec in emp_cur
LOOP
   FOR i in 1 to :P102_NO
   LOOP
      <stuff and or things>
   END LOOP;
END LOOP;However you aren't making reference to your variable (i) anywhere ... so what exactly are you trying to do?
How about you show us your cursor, the data you have ... and the data you want when whatever the heck you're trying to do 'works'. We'll be in a much better-er position to help you in that case.

Synchronisation of two for loops...

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