Can MatLab Script run in multi-cores?

Whe LabVIEW runs a Matlab code through 'Matlab Script', does the 'Matlab Script' part run in a single-thread mode or multi-thread mode? It uses the ActiveX to communicate with Matlab so I am assuming it is single-thread?
I have a LabVIEW code which has to call a .m file. I am wondering whether the program performance will be greatly improved if I convert the .m file into a .dll to eliminate the need to activate the Matlab server very time.
Solved!
Go to Solution.

You are correct in your supposition that the MATLAB Script nodes run single-threaded. Only one script will be able to run at a time.
You may be able to improve performance by building it into a DLL, but you'd have to test it on your machine to know by how much. I don't really thing this would be too significant. Building a code into separate DLLs may also allow you to improve performance by allowing for parallelization as you could call the separate DLLs in different threads, I believe.
Another option would be using the MathScript node - that allows for parallelization.
MATLAB® is a registered trademark of The MathWorks, Inc.

Similar Messages

Can a script run faster?

I've written a script that uses Adobe Soundbooth to compile and manipulate audio clips. Generating an 8 minute track via the script, however, takes about 5+ minutes. (Soundbooth must import and manipulate the files 1 by 1). Furthermore, during this time I must not touch the computer as to not interfere with the script's progress.
Adobe Soundbooth does not have Applescript support so there are many “tells” for “system events” etc. I’m wondering if I got Apple’s Soundtrack Pro, which does have an Applescript dictionary, the script could run faster? Or perhaps it could at least run in the background to free up the computer for other uses while it’s running?
I’m an Applescript newbie so I'm pretty clueless. I’m thrilled just to have written this first script!
Thank you so much for your help.

Normally yes, although you can use use a " ignoring application responses" block to tell your script to not wait for a reply from an application.
e.g.
tell application "Finder"
ignoring application responses
duplicate theFile to folder Desktop
end ignoring
end tell
Normally the script would pause while it waits for the Finder to complete the duplication of the file, but in this script the script would just continue on without waiting.
Of course this can be risky. In the case of the above script, if I added a line to try to do something with the file on the desktop, that line will fail if the script executes it before the Finder has finished copying. Ignoring can be a nice way of having multiple applications working in parallel, but it's then up to the script to check that the tasks have completed. You should also bear in mind that errors may not be picked-up as they normally would if the script waited for confirmation.

Can this script run faster?

Hello,
The User dictionary does not always seem to work properly. The workaround is a script that creates discretionary hyphens for certain words.
The following script first deletes all discretionary hyphens in a document being converted from PageMaker to InDesign. It then searches the document for 1900+ words and inserts discretionary hyphens in those words. The script has two arrays with that many elements, one for the words to be searched for, the other with the discretionary hyphens for those words. The script works fine but it takes about a minute to cycle through a 100 page document and 1900+ words.
Is there a way to re-write this script so that it goes faster? Just curious.
Thanks,
Tom
#target InDesign
app.scriptPreferences.version = 5.0;
var myDoc = app.activeDocument;
var discrecHyphen = theGrepChanger(myDoc,"~-","");
if(discrecHyphen.length > 0){
     alert("I just deleted "+discrecHyphen.length+" discretionary hyphens.");
     }//end if
else{
     alert("There were no discretionary hyphens in this document.");
     }//end else
var countWords = 0;
var numWords = "";
var wordsChanged = [];
var arrRawWords = ["humongous","array","of","thousand-plus","elements"];
var arrHyphenWords = ["hu~-mon~-gous","ar~-ray","of","thousand-~-plus","el~-e~-ments"];
for(var i =0; arrRawWords.length > i;i++){
     var numWords = theGrepChanger(myDoc,arrRawWords[i],arrHyphenWords[i]);
          if(numWords.length!=0){
               wordsChanged.push(arrRawWords[i]);
               }//end if
          countWords +=numWords.length;
     }//end for i
alert ("I just added discretionary hyphens for " +countWords+" words.\r\rSweet, huh?!");
//*****functions*******
function theGrepChanger(docRef,grepFindIt,grepChangeIt){
     app.findGrepPreferences = NothingEnum.NOTHING;
     app.changeGrepPreferences = NothingEnum.NOTHING;
     app.findGrepPreferences.findWhat = grepFindIt;
     app.changeGrepPreferences.changeTo = grepChangeIt;
     var arrGrepFindIt = myDoc.changeGrep();
     return arrGrepFindIt;
}//end theGrepChanger

OK, it's not the arrays. If you turn on the ESTK's profiler, you get this data:
Line
Time
Hits
1
1
1
4
6
1
5
1939
1
6
183
1
7
5
1
16
1
1
17
1
1
18
14
1
37
389785
1901
38
1981085
1901
39
2692741
1901
40
1197758
1901
41
1132369
1901
42
38969087
1901
43
2165
1901
44
1741
1901
45
9
2
I wrapped your script in a function() {} to see if it would report times in the array lookups, so it doesn't. Perhaps it's being optimized out. Anyhow, it spends all the time in line 42, which is the mydoc.changeGrep(). Oh, the document -- I placed Alice in Wonderland in 12pt Minion Pro Regular on 5.5"x8.5" pages, and then used as my raw words the first 1900 words in /usr/share/dict/words and as their hyphenation pairs inserted a ~ after every letter 'c'. Takes about 46 seconds to run.
You might also think it'd run faster if you opened the document with app.open(File("alice.indd",false) so it shows no window. This seems sort of true, but then ID crashes on the 872nd word ("accept", hyphed as "ac~c~ept"), probably one of the few words in my hyphenation list that actually shows up in Alice. Oh well... It also doesn't seem much faster -- takes about 20 seconds to get to 872, which seems about the same time as with the window open.

Final Cut Express-can it be run on a Core Solo mini?

Could Final Cut Express 4 be installed and used on a Core Solo Mac mini?

Yes, if it meets the minimum requirements laid out on the FCE web page. There will be some loss of functionality because of the lack of graphics card.

Running Matlab Scripts in Parallel

I have several MATLAB scripts running in my LabVIEW VI via MATLAB script nodes, and one of them in particular slows by program down considerably. It dawned on me that I could just take the slowest commands in the script, place them in a script node running a separate VI, and run the two VIs in parallel. It seems it doesn't work that way, though - my main program runs a little faster than it did before, but I only get a major speed increase when I stop the second VI.
I realized a long time ago that two VIs running in parallel share the same MATLAB environment and can even address the same variables, but it never occurred to me that I couldn't actually run two MATLAB scripts at the same time - and that seems to be the case.
What would be the best way around this limitation? Is there some way I can force the two VIs to use separate MATLAB environments? (There's plenty of resouces available on the computer, so I'm not particularly worried about inefficiency.) Would compiling the VIs or compiling the scripts somehow help?

What is your LabVIEW version. How complicated is the matlab code? Would it be easy to rewrite it in plain LabVIEW?
Have you tried to see if it runs in mathscript instead?
( I am not sure about performance comparisons and I also don't know if mathscript can run in parallel.).
How many CPU cores do you have?
LabVIEW Champion . Do more with less code and in less time .

How we can import and run the matlab codes in labview using xmath script.

hello,
i have some GUI code in MATLAB and i want to process that codes in labview . tell me about the procedure how we can done this task.
thanks in advance
rachana
Er. (Instrumentation)

Hello,
The title of your post asks about using Xmath script. Is this what you intended? You can use the Xmath script node in LabVIEW if you have MATRIXx 7.x or earlier installed. However, the syntax is slightly different from the syntax of The MathWorks, Inc. MATLAB® software.
In LabVIEW 8.0, we introduced LabVIEW MathScript. The LabVIEW MathScript syntax is similar to the MATLAB language syntax. In LabVIEW MathScript, you generally can execute scripts written in the MATLAB language syntax. However, the MathScript engine executes the scripts, and the MathScript engine does not support some functions that the MATLAB software supports. In order to reuse code that you have written, open the MathScript Window by going to Tools >> MathScript Window. You can also use the MathScript node as part of a VI you are writing. You can find the node on the Programming >> Structures palette. You can import an existing script by right-clicking the node and selecting "Import..." You can create inputs and outputs for the script by right-clicking on the node and selecting the appropriate option. If you wish to call any functions you have written, put them in the MathScript search path. By default, this is your "My Documents\LabVIEW Data" folder. In LabVIEW 8.5, you can change the default search path for the main application instance by going to Tools >> Options.
LabVIEW MathScript does not contain very many GUI functions at this time. You can use the VI's front panel as your GUI, though, and interact with your program that way. Let me know if you have other questions about moving your code or about specific functions.
MATLAB® is a registered trademark of The MathWorks, Inc.
Grant M.
Staff Software Engineer | LabVIEW Math & Signal Processing | National Instruments

I have some software problems of running matlab script node in the LabVIEW program.

Hi there,
I wrote a simple matlab code, like x= 1, y = x*2. Then I tried to put them into matlab script node in LabVIEW.
However, when I ran the program, I couldn't run and Labiew show some error.
Then I tried the method talked before on this forum. Please see the following link.
http://forums.ni.com/ni/board/message?board.id=MathScript&thread.id=571
I followed the instruction and open the "command prompt," type some commands then I could run the program, and simultaneously, the LabVIEW program open "Matlab command line window" and run my labview code. However, if I didn't use the command prompt, the "matlab command window" will not be opened by running the labview program. It would just show some error. And even if I turn on the matlab program in advance, I still couldn't run the labview program.
Is there any effecient way to deal with this problem without using "command prompt?" Because I try another PC with both matlab and labview installed on it, I "can" run my simple matlab script node on it, and it will open the matlab command line window automatically by running my code. Therefore, I thought there might be some software linking problems in the previous PC I used . Do you have any ideas?
Thanks in advacne.

This board is for Mathscript, but you seem to have a matlab problem. You should probably post in the LabVIEW forum instead.
What is your LabVIEW version? What is you matlab version?
LabVIEW Champion . Do more with less code and in less time .

I cannot run the matlab script node in the labview

Hi there,
My LabVIEW version is 8.5, and matlab version is R2008a.
I wrote a simple matlab code, like x= 1, y = x*2. Then I tried to put them into matlab script node in LabVIEW.
However, when I ran the program, I couldn't run and Labiew show some error.
Then I tried the method talked before on this forum. Please see the following link.
http://forums.ni.com/ni/board/message?board.id=MathScript&thread.id=571
I followed the instruction and open the "command prompt," type some commands then I could run the program, and simultaneously, the LabVIEW program open "Matlab command line window" and run my labview code. However, if I didn't use the command prompt, the "matlab command window" will not be opened by running the labview program. It would just show some error. And even if I turn on the matlab program in advance, I still couldn't run the labview program.
Is there any effecient way to deal with this problem without using "command prompt?" Because I try another PC with both matlab and labview installed on it, I "can" run my simple matlab script node on it, and it will open the matlab command line window automatically by running my code. Therefore, I thought there might be some software linking problems in the previous PC I used . Do you have any ideas?
Thanks in advacne.

Hi, and thanks for the post! I hope your well today.
This may help,
MATLAB® version 2006b (7.3) and version 2008a do work with LabVIEW
8.20. This problem can occur if a new version of the MATLAB® software
is installed along with a previous installation, which is then
uninstalled. The uninstallation of the older MATLAB® software results
in removing the ActiveX/COM components LabVIEW uses. This can cause the
MATLAB® script node in LabVIEW to stop working. There are three
solutions to this problem.
Uninstall the MATLAB® software and reinstall it. This should install the necessary ActiveX component.
Restore the MATLAB® automation server. Browse to the \bin directory (e.g. MATLAB\R2006b\bin) and type matlab -regserver ,
which will reset the registry settings and start the server. The server
can then be closed and the MATLAB® script node will work properly again
in LabVIEW. LabVIEW may need to be restarted if VIs are open that
contain MATLAB® script nodes.
Leave both versions of the MATLAB® software installed.
MATLAB® is a registered trademark of The MathWorks, Inc. Other
product and company names listed are trademarks and trade names of
their respective companies.
Did you have an older version of MATLAB before 2008a?
Kind Regards,
James.
Kind Regards
James Hillman
Applications Engineer 2008 to 2009 National Instruments UK & Ireland
Loughborough University UK - 2006 to 2011
Remember Kudos those who help!

BUG found while running Matlab Script

Hi there,
I am trying a very simple vi exacmple for learning MathScript. My labview is 2011 and my matlab is 2011b, they both install in the same computer. My OS is windows 7 (64bit). I am trying to writing the following script to the block
t=0:0.01:3;
y=sin(t);
while y will be the output name of the MathScript. I connect this symbol to the a graph and run the program. For the very first time, it call out the matlab platform and run the program directly and the result was shown in the graph. However, whenever I want to modify the script and trying to save the vi, it reports some error and the program get terminated "DAbort 0x1A7102DF in fpsane.cpp". It is so weird. If I open the closed VI again, it can run without any problem for the first modificaiton, but the problem comes again if I modify the script again after the first run.

Sorry, I currently don't have matlab installed, so I cannot test your VI containing the matlab script.
If I copy the text of your matlab script to a MathScript node instead, everything works just fine.
It is possible that the problem is within matlab and not a LabVIEW problem. I cannot tell.
MathScript is a LabVIEW toolkit that can run scripts with a matlab like syntax. You need to purchase it seperately (windows), but you can also download an evalution copy to try for free. The version for Mac and linux seems to be free but I have note tried. Are you a student? The LabVIEW student editions also include MathScript.
LabVIEW Champion . Do more with less code and in less time .

Why can't cron run one of my scripts [SOLVED]

I'm confused why cron can't run one of my scripts which runs just fine interactively. I see no errors in messages.log or crond.log.
My crontab:
$ crontab -l
# * * * * command to be executed
#| | | | |
#| | | | +----- day of week (0 - 6) (Sunday=0)
#| | | +------- month (1 - 12)
#| | +--------- day of month (1 - 31)
#| +----------- hour (0 - 23)
#+------------- min (0 - 59)
#MAILTO=""
25 20 * * * ~/bin/cpuz s
Here is the code to that script:
run() {
tmpfile=/tmp/.sensors_unique.txt # temp output
verbose=/tmp/.verbose_unique.txt # verbose temp output with three decimals
logfile=/scratch/unique.csv # data file to write
sensors >$tmpfile && sensors -u >$verbose
phys=$(grep Physical $tmpfile | cut -c 18-21)
c0=$(grep "Core 0" $tmpfile | cut -c18-21)
c1=$(grep "Core 1" $tmpfile | cut -c18-21)
c2=$(grep "Core 2" $tmpfile | cut -c18-21)
c3=$(grep "Core 3" $tmpfile | cut -c18-21)
vcc=$(grep in0_input $verbose | cut -c14-18)
fan1=$(grep fan1 $tmpfile | cut -c24-27)
pwm1=$(cat /sys/class/hwmon/hwmon3/device/pwm1)
per1=$(echo "scale=2; $pwm1/2.55" | bc)
fan3=$(grep fan3 $tmpfile | cut -c24-27)
pwm3=$(cat /sys/class/hwmon/hwmon3/device/pwm3)
per3=$(echo "scale=2; $pwm3/2.55" | bc)
fan4=$(grep fan4 $tmpfile | cut -c24-27)
pwm4=$(cat /sys/class/hwmon/hwmon3/device/pwm4)
per4=$(echo "scale=2; $pwm4/2.55" | bc)
fan5=$(grep fan5 $tmpfile | cut -c24-27)
pwm5=$(cat /sys/class/hwmon/hwmon3/device/pwm5)
per5=$(echo "scale=2; $pwm5/2.55" | bc)
dts=$(date +"%m-%d-%y %r")
[[ ! -f $logfile ]] && echo "dts,vcc,temp,core0,core1,core2,core3,120mm_rpm,120mm_pwm,140mm_rpm,140mm_pwm,comment" > $logfile
echo "$dts,$vcc,$phys,$c0,$c1,$c2,$c3,$fan4,$pwm4,$fan5,$pwm5,$comment" >> $logfile
if [ -n "$output" ]; then
echo "Vcore : $vcc"
echo "back : $fan1 ($pwm1/255) = $per1 %"
echo "top : $fan3 ($pwm3/255) = $per3 %"
echo "120mm : $fan4 ($pwm4/255) = $per4 %"
echo "140mm : $fan5 ($pwm5/255) = $per5 %"
fi
case "$1" in
s)
limit=600 # number of times to run
wait=2 # delay in sec before taking a new reading
echo running in silent mode...
x=0
while [ "$x" -lt "$limit" ]; do
x=$(( $x + 1 ))
run
sleep "$wait"s
done
v)
export output="not null"
export -f run
/usr/bin/watch run
echo "usage $0 {s|v}"
echo
echo "s) silent mode/logfile only"
echo "v) verbose mode/logfile + output"
exit 0
esac
Last edited by graysky (2012-08-01 00:44:16)

I hate to suggest something obvious to someone with 4000 posts (and such a scary avatar), but have you tried it with the full path: /home/user/... ?
Are you sure the script is not being run at all?
(edit -- never mind, I see the file lines in there)
Last edited by 2ManyDogs (2012-08-01 00:33:03)

Matlab scripts that function properly when run in matlab generating errors in labview

Hi, I'm running LabView 7.1 and trying to use some matlab scripts in my lab view script.
The code runs fine in matlab, but when I run it in lab view I get errors as follows:
"LabVIEW: Error occurred while executing script. Error message from server: ??? Error using ==> mrdivide
Matrix dimensions must agree.
Error in ==> extract_inl_NI at 46
in array_test.vi"
There is no division in line 46 (in fact it's a blank line). Are there syntax changes that I may not know? Or perhaps a way to compile my code to ensure it runs correctly?

Hello,
Can you post your code (VI) here, or better yet a simplified version of it which still causes a problem. If you can also post a simple version which functions as you expect, that would be nice, but it sounds like the plotting problem is intermittent. This should work, per the following document, but perhaps there's an issue:
http://digital.ni.com/public.nsf/websearch/57FE03DA9C357E9486256A0D00739CA6?OpenDocument
Hopefully after seeing the code I will have more ideas about what may be going wrong. As a final thought, are there any parameters to the plot function which can be passed to make it show the plot or make it the active window... could this be a very strange UI feature? I guess it will make more sense when I see the VI(s).
I look forward to your repost!
Best Regards,
JLS
Best,
JLS
Sixclear

Matlab script in executable won't run

I'm having trouble with getting a VI with a MATLAB script to run reliably, specifically when built into an executable.
I'm using LV8.0, Matlab R2006a.
The VI (not executable) runs properly when I start the computer fresh (i.e. just after a reboot)
The MATLAB command window opens as soon as I open the VI.
If I build an executable and run it, it works, so long as I haven't closed LabVIEW and the VI.
If instead, I attempt to close out LabVIEW and run the executable alone, the MATLAB command window does not start, and the MATLAB functionality is ignored.
I have updated all of my dlls, and I have checked the box enabling the ActiveX server (though I don't know what to name the server). I have also read all the associated Knowledge Bases, and found their solutions did not apply.
I also have intermittent issues running the VI once I have tried running the executable.
If I make a change to my MATLAB script, I can get the VI to run again, but if it has failed once, the MATLAB command window no longer opens when the VI is opened.
I can solve this problem by rebooting too, but it seems like there should be a better way.
Any ideas?

Hi tblir,
Can you try to run and build into an
executable one of the shipping examples (i.e. MATLAB Script – Fractal.vi)? Let me know if this exemplifies the same behavior.
Ecleamus Ricks, Jr.
National Instruments
Applications Engineer

This java script run Microsoft Ie. but it can't run with Mozilla browser.

this script run url with Microsoft Internet Explorer. But can't Mozilla Firefox Browser
How can run it in Mozilla Firefox
here is java script code.
<f:verbatim>
<script type="text/javascript">
function karakterSayisiniSinirla(inMetinOge, inBildirimOge, inAdet)
if (inMetinOge.value.length > inAdet) {
inMetinOge.value = inMetinOge.value.substring(0, inAdet);
else {
inBildirimOge.value = inAdet - inMetinOge.value.length;
</script>
</f:verbatim>

i put this script in afh header
<?xml version='1.0' encoding='windows-1254'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.0"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:af="http://xmlns.oracle.com/adf/faces"
xmlns:afh="http://xmlns.oracle.com/adf/faces/html"
xmlns:cust="http://xmlns.oracle.com/adf/faces/customizable">
<jsp:output omit-xml-declaration="true" doctype-root-element="HTML"
doctype-system="http://www.w3.org/TR/html4/loose.dtd"
doctype-public="-//W3C//DTD HTML 4.01 Transitional//EN"/>
<jsp:directive.page contentType="text/html;charset=windows-1254"/>
<f:view>
<afh:html binding="#{backing_gercekkisi.html1}" id="html1">
<afh:head title="gercekkisi" binding="#{backing_gercekkisi.head1}"
id="head1">
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1254"/>
<style type="text/css">
body {
background-color: #e7e7e7;
</style>
<script type="text/javascript">
function karakterSayisiniSinirla(inMetinOge, inBildirimOge, inAdet)
if (inMetinOge.value.length > inAdet) {
inMetinOge.value = inMetinOge.value.substring(0, inAdet);
else {
inBildirimOge.value = inAdet - inMetinOge.value.length;
</script>
</afh:head>
and then i call this script like this
<af:inputText value="#{bindings.SorunAciklama.inputValue}"
label="İstenen Bilgi veya Belgeler :"
required="#{bindings.SorunAciklama.mandatory}"
columns="40"
binding="#{backing_gercekkisi.inputText7}"
id="inputText7" rows="5"
tip="(Ayrılan alana en fazla 2000 karakter uzunluğunda metin girebilirsiniz)"
onchange="karakterSayisiniSinirla(this, document.getElementById('kalan'), 2000)"
onkeydown="karakterSayisiniSinirla(this, document.getElementById('kalan'), 2000)"
onkeyup="karakterSayisiniSinirla(this, document.getElementById('kalan'), 2000)">
<af:validator binding="#{bindings.SorunAciklama.validator}"/>
</af:inputText>
<af:panelHorizontal halign="center">
<f:verbatim>
<p>
<font size="2" color="#0000ff">
Kalan:
</font>
<input type="text" name="kalan" value="2000" size="4"
readonly="readonly"/>
</p>
</f:verbatim>
</af:panelHorizontal>
but this script can't in Mozilla.

Firefox freezes due to a script running. how can I stop it or fix it

I keep having a script run when I am playing Face Book games Especially Battle Pirates and it freezes everything. What can i do to stop it? Or fix it so it dosen't freeze my game?
This script runs over and over while I am playing Battle Pirates. Every time it runs it freezes the darn game and I have to click and click on the screen before a box pops up with a long string and asks if I want to stop the string. This is what it says:
"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete."
" Script:http://static.ak.fbcdn.net/rsrc.php/...tS5XVSwP/ks:42 "
What is this and dose it need to run or is it a hacker messing with me and my FF browser ?
When I'm in the middle of a battle screen and it freezes it messes me up. If I am in full screen when it freezes it throws me to another open Browser tab or out of full screen if i don't have another open.
What is this? Something to do with FaceBook? A Hacker ? A BP game glitch. please help. This is driving me crazy. Imagine being in the middle of the best part of a BP battle and freeze.... then click click click i go and zoom to another open window away from the battle so i no longer have a view of the fight let alone control it or boom to non full screen and 1/2 the screen is obscured.
It just happened again while I was typing this request for help. I have a window open with BP also and it took me there. HELP

Hi knighterrant56,
Have you looked at the Knowledge Base article [[Problems using Facebook in Firefox]]? There is a lot of good troubleshooting information in there. Please be sure to try all of the suggested steps. Each one is valuable and may be the answer to your issue.
Hopefully this helps!

I can't find the MATLAB script node in labview

We are using a MAC G4 with OS 9. We also have labview 5.1. I have looked under Mathematic>>Fomula in the tools palette and I cannot find the MATLAB script node.
Is there an extra download that I need to get this MATLAB script node?

The HIQ and MATLAB script nodes are only available in the full and professional development systems. If you have one of these versions, these nodes should be under the Mathematics>>Formula palette.
If you have the base package of LabVIEW, you will not have access to these script nodes. Details about which options are included in which development packages can be found at:
http://www.ni.com/labview/devchart.htm

Can MatLab Script run in multi-cores?

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