Using the Wait function in while loops?

Hi,
I have a rather complicated top level VI with about 20 subVIs and the main VI has on big while loop around it and another smaller one inside, basically it runs rather slow and I have no idea how to set the wait function. I mean what factors should I consider..what would be the difference between setting it to 10 and 100 (besides the obvious 10ms vs 100ms)? I just want to increase the performance of the executable, so it is not that slow. Can you offer some hints as to what I need to take into consideration when determining my delay? And also, are while loops the only place that I should use the delay or are there other instances too?

Adding waits is not a fix-all for slow running applications. Its just one thing that can be done to improve things. If you determine that a sub-vi is causing your problems then you need to find out exactly what that vi is doing to slow you down. If its because there is a loop inside it that is running constantly as fast as it can, then a delay in that loop may help. If that is not your problem then you need to look at other ways to boost performance. It sounds like you have alot of locals variables, each instance of a local variable makes a copy of the data that's in the control. If the controls/indicators that you have local variables of contain large amounts of data then you may be filling up memor
y with copies of it.
I suggest that you study the "Performance and Memory Management" chapter of the LabVIEW manual. This can found in the printed manual of the older versions, in the online manuals that install with 6i, or on NI's web site here: http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/732cec772aa4fbe586256a37005541d3?OpenDocument , which is Application Note 168. This should give you some good ideas of what to look for to improve your performance.
Hope this helps.
Brian

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GUI window doesnt open when using the .wait()

Hi everyone
I new to java. I'm experimenting with nebeans 6.1. I building a GUI, which uses other GUI windows. Can anyone give me an example of how to use the .wait function to so that the main gui doesn't continue until the other gui's selection is made. I'm using swing.

I thought making it modal would halt the loop until my selection was made in the gui. It will. You are doing something wrong.
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I am using a timed while loop and am unable to get the loop to run at a speed of less than 1ms (I am currently using the Wait(ms) function). How can I get a faster response?

I am trying to create a virtual engine within a timed while loop and am unable to get the loop to run at a speed of less than 1ms (I am currently using the Wait(ms) function). This does not however allow realistic engine speeds. How can I overcome this? I have access to a PCI-MIO-16E-4 board.

andyt writes:
> I am using a timed while loop and am unable to get the loop to run at
> a speed of less than 1ms (I am currently using the Wait(ms) function).
> How can I get a faster response?
>
> I am trying to create a virtual engine within a timed while loop and
> am unable to get the loop to run at a speed of less than 1ms (I am
> currently using the Wait(ms) function). This does not however allow
> realistic engine speeds. How can I overcome this? I have access to
> a PCI-MIO-16E-4 board.
Andy,
Unless you use a real time platform, getting extactly 1 ms loop rate
(or even less) is impossible. It starts getting troublesome at about
0.1 Hz for standard operating systems.
I'd tackle your problem with "if i mod 10 == 0 then sleep 1 ms".
Of
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Unable to change reference point location while using the Transform Functions in Photoshop Elements 6.0.

Which operating system are you using?
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Certain LinkedIn functions are not working. Browser keeps on looping, for instance when using the search function

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When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.
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Use Command+Shift+r to reload the page fresh from the server. Any difference? If not...
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How to isolate the wait function to one part of the code

I'm buildling an ecg montoring system along with programming an external stimulator using TTL pulses to work along side the information obtained from the ECG.The most important of these features is the heart rate. However, whenever I activate my pulse trains in the code, the DAQmx Wait Until Done.vi function pauses everything in the code, including the part of my code that monitors the heart rate, which uses time to measure it. What I would like, is the wait function to only affect the pulse train generators without pausing anything else in the code. Is this possible? And if so how can I make it happen?
I will attach my vi
Solved!
Go to Solution.
Attachments:
simulatejed.vi ‏130 KB

Your problem is that everything is in the same loop. So the longest operation is going to determine the loop rate (and therefore processing rate). What you really need to do is separate your tasks into separate loops. Use queues and/or notifiers to communicate your data and commands between loops.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Question about the Wait Function

I wrote a VI to store the time stamps in a text file.
I fond something strange in the text file (see the picture below).
The time stamps weren't writen into the file every 10 ms! How could this happen? And how could I fix it and make the time stamp to be writen every 10ms?
Thanks a lot!

To further what was just said:
The wait function will indeed wait 10ms, or near enough as I will soon explain.
When used in a loop, the wait function will wait for 10ms AFTER the code inside the loop has been executed.
Depending on your Operating System, and the speed of your PC, the code inside the loop could take several hundred milli-seconds to execute.
So the total time for each loop iteration, and thus the time between file writes, will be (Xms + 10ms), where X is the time taken to execute the other code.
Another thing to consider is that unless you are using a Real-Time OS, your Windows or Mac OS will not prioritise LabVIEW! The execution of your code must run alongside your virus scanner, email client, music player etc. etc. etc.
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Apologies, I have diverged.
Rhys
Applications Engineer
National Instruments

How to use the Table Function defined in package in OWB?

Hi,
I defined a table function in a package. I am trying to use that in owb using Table function operator. But I came to know that, owb R1 supports only standalone table functions.
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Hi Marcos,
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How to get the last error for while loop?

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If the shift register is not what you want, use a plan tunnel instead.
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How can i use the same cursor in a loop fro multipletimes.

I am using two cursors.One to fetch sites and the other to fetch participants under each site.I am performing some job with that participants data.Now the problem is i am using the 2nd cursor in a loop.So it fetches the data of participants falling under one state.But when it comes to the second state,as the second cursor is already open it is unable to fetch the records.Please help me .How can i use the same cursor in a loop fro multipletimes.
I am sending the code which i have written in When-Button-Pressed-Trigger...
declare
 sid number;
 pid number;
cursor csid is select distinct(site_id) from cyber_ppt;
cursor cpid is select pc_id,st_dt,ed_dt from cyber_ppt where site_id = sid;
 stdt varchar2(10);
 eddt varchar2(10);
 nom number;
 stmonth varchar2(10);
 edmonth varchar2(10);
 cjan number:=0;
 cfeb number:=0;
 cmar number:=0;
 capr number:=0;
 cmay number:=0;
 cjun number:=0;
 cjul number:=0;
 caug number:=0;
 csep number:=0;
 coct number:=0;
 cnov number:=0;
 cdec number:=0;
 i number:=1;
begin
 open csid ;
 loop
 fetch csid into sid;
 exit when csid %notfound;
 message(sid);
 open cpid;
 loop
 fetch cpid into pid,stdt,eddt ;
 exit when cpid %notfound;
 message(sid||'-'||pid);
 stmonth:=substr(stdt,4,3);
 edmonth:=substr(eddt,4,3);
 nom:= months_between(eddt,stdt);
while i <= round(nom)
 loop
 stmonth:=substr(stdt,4,3);
if stmonth='JAN' then
 cjan:=cjan+1;
elsif stmonth='FEB' then
 cfeb:=cfeb+1;
elsif stmonth='MAR' then
 cmar:=cmar+1;
elsif stmonth='APR' then
 capr:=capr+1;
elsif stmonth='MAY' then
 cmay:=cmay+1;
elsif stmonth='JUN' then
 cjun:=cjun+1;
elsif stmonth ='JUL' then
 cjul:=cjul+1;
elsif stmonth ='AUG' then
 caug:=caug+1;
elsif stmonth ='SEP' then
 csep:=csep+1;
elsif stmonth ='OCT' then
 coct:=coct+1;
elsif stmonth ='NOV' then
 cnov:=cnov+1;
elsif stmonth ='DEC' then
 cdec:=cdec+1;
end if;
 stdt:=add_months(stdt,1);
 i:=i+1;
 end loop;
 end loop;
 end loop;
 end;


try this /* untested */
DECLARE
sid NUMBER;
pid NUMBER;
CURSOR csid IS SELECT DISTINCT(site_id) FROM cyber_ppt;
CURSOR cpid(nSid NUMBER) is SELECT pc_id,st_dt,ed_dt FROM cyber_ppt WHERE site_id = nSid;
stdt VARCHAR2(10);
eddt VARCHAR2(10);
nom NUMBER;
stmonth VARCHAR2(10);
edmonth VARCHAR2(10);
cjan NUMBER:=0;
cfeb NUMBER:=0;
cmar NUMBER:=0;
capr NUMBER:=0;
cmay NUMBER:=0;
cjun NUMBER:=0;
cjul NUMBER:=0;
caug NUMBER:=0;
csep NUMBER:=0;
coct NUMBER:=0;
cnov NUMBER:=0;
cdec NUMBER:=0;
i NUMBER:=1;
BEGIN
FOR rec IN csid
LOOP
 sid := rec.csid;
FOR cRec IN cpid(sid)
LOOP
 pid := cRec.pc_id;
 stdt := cRec.st_dt;
 eddt := cRec.ed_dt;
stmonth:= SUBSTR(stdt,4,3);
edmonth:= SUBSTR(eddt,4,3);
nom:= months_between(eddt,stdt);
WHILE i <= round(nom)
LOOP
 stmonth := SUBSTR(stdt,4,3);
IF stmonth='JAN'
THEN
 cjan:=cjan+1;
ELSIF stmonth='FEB' THEN
 cfeb:=cfeb+1;
ELSIF stmonth='MAR' THEN
 cmar:=cmar+1;
ELSIF stmonth='APR' THEN
 capr:=capr+1;
ELSIF stmonth='MAY' THEN
 cmay:=cmay+1;
ELSIF stmonth='JUN' THEN
 cjun:=cjun+1;
ELSIF stmonth ='JUL' THEN
 cjul:=cjul+1;
ELSIF stmonth ='AUG' THEN
 caug:=caug+1;
ELSIF stmonth ='SEP' THEN
 csep:=csep+1;
ELSIF stmonth ='OCT' THEN
 coct:=coct+1;
ELSIF stmonth ='NOV' THEN
 cnov:=cnov+1;
ELSIF stmonth ='DEC' THEN
 cdec:=cdec+1;
END IF;
 stdt:=add_months(stdt,1);
 i:=i+1;
END LOOP;
END LOOP;
END LOOP;
END;

How to use the pps function from JCOP?

Hi
I'm trying to use the pps function from JCTerminal (JCOP API: [url http://www.cs.ru.nl/~woj/jcopapi/com/ibm/jc/JCTerminal.html#pps(int, int)]pps function ) to connect my client to a virtual card with a specific protocol (T=0).
But I always got the error: "Protocol and parameter selection not supported by this terminal!"
I've tried to make an ATR that support both protocol : [url http://smartcard-atr.appspot.com/parse?ATR=3b909580811fc7dc]3B 90 95 80 81 1F C7 DC.
I really don't know what value to put in the second parameter (baud rate), I've tried with 150000, which is in the range of the ATR but I'm not sure this is correct. And I could't find any example of it.
I'm also not sure where to put the pps command, the specification say directly after a reset, so I tried this implementation:
System.out.print("Start");
 readers = TerminalFactory.getDefault().terminals().list(State.CARD_PRESENT);
 //If no readers has a card it ends the process
 if(readers.isEmpty()){
 System.out.println("\nNo card in the reader...");
 return;
 System.out.println("\nReader Type: "+readers.get(0).toString());
 term = (PCSCJCTerminal)JCTerminal.getInstance("PCSC", readers.get(0).toString().substring(15));
 term.open();
 System.out.println("\nTerminal opened");
 //Getting the ATR
 atr = new ATR(term.waitForCard(2000));
 try {
 term.pps(JCTerminal.PROTOCOL_T0, (int)150000);
 } catch (Exception e) {
 e.printStackTrace();
 System.out.println("ATR: "+toHex(atr.getBytes()));
 //sending a data 11223344
 System.out.println("\nsending data: 11223344");
 byte[] responsesend = term.send(0,cmdsend,0,cmdsend.length);
 System.out.println("Response data is:" + toHex(responsesend));
 //close terminal
 term.close();
 System.out.println("\nTerminal closed");I've got this output on the console:
StartReader Type: PC/SC terminal Virtual CAD Reader 0
Terminal opened
ATR: 3b 90 95 90 00 81 1f c7 cc
sending data: 11223344
Protocol and parameter selection not supported by this terminal!
 at com.ibm.jc.JCTerminal.pps(Unknown Source)
 at com.test.essai.main(essai.java:46)
>
And If I take a look at the data exchanged with the card:
Running in Virtual Card mode...
ATR: 3B909580811FC7DC
Waiting for event (power: off, protocol: unknown/undefined)...
Waiting for event (power: off, protocol: unknown/undefined)...
Raw event data: 01
Event: VCAD_EC_POWER_ON (0x01)
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_POWER_ON) ATR: 3b909580811fc7dc
Raw reply data: 003b909580811fc7dc
Sending reply...
Waiting for event (power: on, protocol: unknown/undefined)...
Waiting for event (power: on, protocol: unknown/undefined)...
Raw event data: 06ff11957b
Event: VCAD_EC_EXCHANGE_TPDU (0x06) C-TPDU: ff11957b
Accepting any PPS request parameters: Protocol: t=1; FI=9, DI=5
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_EXCHANGE_TPDU) R-TPDU: ff11957b
Raw reply data: 00ff11957b
Sending reply...
>
This (above) is the PPS command but not from the PPS function, it is always sent with protocol T=1
Waiting for event (power: on, protocol: t=1)...
Raw event data: 0501
Event: VCAD_EC_SET_PROTOCOL (0x05) Protocol: t=1
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_SET_PROTOCOL)
Raw reply data: 00
Sending reply...
Waiting for event (power: on, protocol: t=1)...
Raw event data: 0600c10120e0
Event: VCAD_EC_EXCHANGE_TPDU (0x06) C-TPDU: 00c10120e0
Handling protocol-specific command...
Protocol block:
NAD: 0x00
PCB: 0xc1 (T1_S_BLOCK); S-Block type: T1_SBT_IFS_REQ
LEN: 1
INF:
IFS: 20
EDC: 0xe0
Changing IFS(other) from 32 to 32
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_EXCHANGE_TPDU) R-TPDU: 00e10120c0
Raw reply data: 0000e10120c0
Sending reply...
Waiting for event (power: on, protocol: t=1)...
Raw event data: 0600001300a404000d54657374436c69656e7441707000f0
Event: VCAD_EC_EXCHANGE_TPDU (0x06) C-TPDU: 00001300a404000d54657374436c69656e74
41707000f0
Processing app. command...
App. block:
NAD: 0x00
PCB: 0x00 (T1_I_BLOCK); Seq. #: 0; More data: 0
LEN: 13
INF:
00a404000d54657374436c69656e7441707000
EDC: 0xf0
cmd name: N/A (class #4)
cmd: 00a40400 0d 54657374436c69656e74417070 70
Responding with the reversed command data, SW is hardcoded to 90<INS>
rsp: 707041746e65696c4374736554 90a4
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_EXCHANGE_TPDU) R-TPDU: 00000f70704
1746e65696c437473655490a475
Raw reply data: 0000000f707041746e65696c437473655490a475
Sending reply...
Waiting for event (power: on, protocol: t=1)...
Raw event data: 060040041122334400
Event: VCAD_EC_EXCHANGE_TPDU (0x06) C-TPDU: 0040041122334400
Processing app. command...
App. block:
NAD: 0x00
PCB: 0x40 (T1_I_BLOCK); Seq. #: 1; More data: 0
LEN: 4
INF:
11223344
EDC: 0x00
cmd name: N/A (class #1)
cmd: 11223344
Responding with the reversed command data, SW is hardcoded to 90<INS>
rsp: 9022
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_EXCHANGE_TPDU) R-TPDU: 0040029022f
0
Raw reply data: 000040029022f0
Sending reply...
Waiting for event (power: on, protocol: t=1)...
Raw event data: 03
Event: VCAD_EC_POWER_OFF (0x03)
Reply: VCAD_SC_OK (0x00) (in reply to VCAD_EC_POWER_OFF)
Raw reply data: 00
Sending reply...
Waiting for event (power: off, protocol: unknown/undefined)...
>
If someone know how to use this function or have any advice to help me to select a specific protocol with Jcop API, please let me know.
If you you need any more information don't hesitate to ask.
Best regards
Edited by: Cyril on Sep 22, 2011 9:54 AM

-1
I'm using a virtual terminal (windows driver), and I don't see how I could turn off the Auto-pps. I've also tried with a real reader and a card and I have the same error.
-2
I've tried value in the range of the atr (based on this analysis: [url http://smartcard-atr.appspot.com/parse?ATR=3b909580811fc7dc]http://smartcard-atr.appspot.com/parse?ATR=3b909580811fc7dc ). But I don't know if only I value of baud-rate is possible in the range. Anyway I just would like to change the protocol, not the baud-rate.
-3
I've already tried to call pps function before, after the first reset, or with another reset later and I always got the same thing.
 term = (PCSCJCTerminal)JCTerminal.getInstance("PCSC", readers.get(0).toString().substring(15));
 term.open();
 System.out.println("\nTerminal opened");
 //Getting the ATR
 atr = new ATR(term.waitForCard(2000));
 System.out.println("ATR: "+toHex(atr.getBytes()));
 jcard = new JCard(term,atr,0);
 jcard.reset();
 try {
 term.pps(JCTerminal.PROTOCOL_T0, (int)312500);
 } catch (Exception e) {
 e.printStackTrace();
 }The same pps is always send after each reset...

Stack overflow at line: 1792 or 1788 when using the search function

Hello everyone,
My name is Thibault. I am a technical communications specialist. I've been using Robohelp html for a couple of years.
I am working on the user guide of the software application developed where I work.
This is a HUGE project, more than 6500 pages.
We're two technical writers on this project. (This is an inportant detail since my colleague doesn't get the problem).
I need your help because I have been having an annoying issue over the last couple of days.
After the project is generated, I open it in the software, clicking F1.
When I want to use the search function I have this error message displayed:
"Stack overflow at line: 1792" or "Stack overflow at line: 1788"
Do you know where this could come from?
Furthermore, I noticed that this stack overflow only occurs on some words.
I mean, it occurs for the most used words in this project.
We have customers all over the world and over the last week, we've been getting a lot of feedbacks about this error message.
I hope someone will be able to help me on this one!
Thanks in advance!

First of all, thanks for your answer RoboColum(n).
Is the problem only when you search for a topic that contains Flash output?
All my topics contain Flash outputs. I generate my output files on a folder that is embedded into the software.When in the software, I click F1 and the Flash User Guide opens.The search function works (or not) depending on the software version (32/64-bit).
At what point exactly does the stack overview occur?
We have two versions of the software a 32-bit version and a 64-bit version.
The search function works fine with the 32-bit version.
The problem occurs when I use the 64-bit version. When I type in a word, for example "unit", the stack overflow message appears. See below:
As you can see, it looks like the search function freezes while the stack overflow message appears.
And I never get this error message with the 32-bit version of our software.
I also wonder whether you can search on a project that contains no Flash output. Perhaps you could try for us?
What do you mean by that?
As I told you previously, my Flash Player version is a 32-bit one.
Do you think that the issue might come from there?

Using the SVDEx function in LabWindowsCVI

Hello,
I am writing an application in LabWindows CVI to display and analize data that we obtain in an optical experiment. The data is a matrix where the subsequent rows represent spectra collected a different times. There are about 200 columns and 100 rows in each matrix. I want to use singular value decomposition using the SVDEx function. I get an error every time i try to execute the code in debugguing mode:
FATAL RUN-TIME ERROR: The program has caused a 'General Protection' fault at 0x0342BC16.
I believe that I am passing the incorrect arrays to SVDEx. I was wondering if there is any example code available, so I can learn how tro do do this.
Here is a fragment of the code where I call the function SVDEx:
//declare the arrays to hold S U V
double *U,*S,*V;
int isizeS=Y_DATA_POINTS;
int i;
int AnalisisError=0;
if (X_DATA_POINTS<Y_DATA_POINTS) {isizeS=X_DATA_POINTS;}
//Allocate arrays
U=malloc(Y_DATA_POINTS*X_DATA_POINTS*sizeof(double));
S=malloc(2*isizeS*sizeof(double));
V=malloc(Y_DATA_POINTS*X_DATA_POINTS*sizeof(double));
AnalisisError = SVDEx (adAbsMap, Y_DATA_POINTS, X_DATA_POINTS, FULL_SIZE, U, S+isizeS, V);
FATAL RUN-TIME ERROR: "Visualize_12.c", line 2451, col 17, thread id 0x00000E18: The program has caused a 'General Protection' fault at 0x0342BC16.
Any help will be very much appreciated.
J. Hodak

Hi,
Thanks for trying to find an answer. I just realized now where the probem was. My mistake was when i allocated the arrays for holding the matrices. Because i was assking SVDEx to carry out FUL SIZE decomposition I must declare the arrays U and V to be , Y_DATA_POINTS*, Y_DATA_POINTS doubles and X_DATA_POINTS*, X_DATA_POINTS doubles respectively. My code was wrong, I was declaring the sizes to be smaller than necessary and "Visualize_12.c", line 2451, was the call to SVDEx, and col 17 was pointing t that mistake. It took me a while to realize this because the error message did not exlicitly specify that the size or the array passed was too small. Now it is working well. But I believe that it will help to have an example to get started with this.
Thanks again,
Fundadero.

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