Matlab R13 vs Labview v 7.1

Hello guys
I have some problems solved previously with MATLAB need to be solved
with labview using the new Control Design Toolbox.
A really simple problem appeared while using the Transfer function to
State space model conversion VI because the results appear totally
different from those in matlab.
The main problem is when u use SS to TF VI and feed it back to TF to
SS VI u don't get the same result.
I examined the SS to TF VI and i think the problem is cause with a
stability matrix T where it is multiplied to the matrices A,B,C and D
which are correctly computed in the first step of the VI.
If any body have any information on this topic. Please respond.
Thank you

There is no set procedure for how these transformations should occur. Each systems response should be the same despite the different transformations used in converting from a transfer-function to a state-space model.
It appears that Matlab will return the state space system in controller companion form. You can use the "CD Canonical State-Space Realization VI" to convert from the form returned from the "CD Convert to State-Space Model VI" to the controller companion form you are observing in Matlab. You just have to specify �Controller Companion� as the form type.
I will attach my VI and M file for comparison.
Attachments:
sstfss.vi ‏209 KB
myss.m ‏1 KB

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How to use matlab function with labview?

Hello,
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Thanks
Solved!
Go to Solution.

floor() exists on the standard labview pallet already and the ones() function would be fairly simple to reproduce. If you only need a few basic functions repost asking for direction on recreating those specific methods. However, you're right - there is not a direct way to use compiled matlab code in labview without full matlab and the math script nodes. If you're really desparate to reuse some some exisiting IP there are C++ alternatives that implement many of the same methods and syntax as matlab (http://arma.sourceforge.net/faq.html). I'm fairly sure there are other tools that attempt to translate matlab code into pure c functions, both of which can be called via a DLL from within labview: https://decibel.ni.com/content/docs/DOC-9076
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Same code gives different results in Matlab Script in Labview and Matlab

I am implemeting a Matlab code into a LabVIEW application using Matlab script. When I import the exactly same code to the Matlab Script in LabVIEW it gives a different result than it is in Matlab. This code is a simulation code including first kind bessel functions. Using LabVIEW 7.1 and Matlab R14 service pack 3.

Labview 8.5
Matlab R2009b
Attached are the graphs produced by matlab script in labview and in matlab.
The minimum of graph produced by matlab code is below 1 and that in labview is above 1.
Thanks a lot for your reply.
Sorry, I haven't quantified the "sometimes" yet.
Attachments:
matlabsResult.jpg ‏29 KB
LV.png ‏84 KB

How to use a Matlab Program within Labview

Hi
I saw in this forum that many users are using some matlab program
executed in Labview program. I have actually Labview 7.1 and would like
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Thanks
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The MATLAB Script function is kinda buried in the function palette, and
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Using Matlab code in LabVIEW

Hi,
I have never used LabVIEW and I am wondering if there is a way to run Matlab code in LabVIEW. If so, how would I do it and are there any special instructions or tips I should know about?

What is your LabVIEW version?
Do you have matlab installed on your computer?
In older LabVIEW versions, you can only use the matlab script node, which requires that you have a copy of matlab installed.
In newer versions, you have two more alternatives that don't require the purchase of Matlab:
Use a mathscript node.
Use a scilab script node.
Information on mathscript: http://zone.ni.com/devzone/cda/tut/p/id/3502
Information on scilab: http://zone.ni.com/devzone/cda/epd/p/id/657
There is even a mathscript forum here: http://forums.ni.com/ni/board?board.id=MathScript
LabVIEW Champion . Do more with less code and in less time .

Using Matlab script in Labview

Hello,
I am trying to use matlab script in labview to post process the sampled signals from DAQ(attached is the vi I tried)
After every 10 seconds I want to the send the sampled voltage data to matlab scritp block which does 1) detection of peaks using peakdetection function and plots the obtained peaks on the sampled signal 2) calculates standard of 10 secs data and plots on chart.
But I am confused of 1) how to call the peakdetection function inside the matlabscript block
2) How to send the 10secs data of voltage and time values to the matlab script block
3) How to plot the signal and detected peaks on the same plot (which can be done in matlab using holdon as shown in the atached vi).
Can someone suggest for implementing these .
Thanks.
Solved!
Go to Solution.
Attachments:
Labview&Matlab.vi ‏55 KB

Thanks GabeG,
Now, Labview&Matlab_TestNoAq.vi is woking Good and for the second one Labview&Matlab_TestAq.vi it is showing error as shown in the attached image when these ines of code are present in the matlab scrtip
subplot(2,1,1),plot(maxtab(:,1),maxtab(:,2),'*r');
SDN=std(maxtab(:,1));
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but when I removed these it is working fine(but not showing the detected peaks).
Can you suggest me a solution for the above and also can I know the best method to add one more channel that samples another device signal which has to be processed in this same way(Signals sampled from 2 devices have to be porcessed in this same way).
Thanks.
Attachments:
Script_Error.JPG ‏133 KB

How to use matlab code in Labview without having MATLAB software. I tried to convert .m files into .dll files. But i could not do. Please help me out..

Please help me out...
Solved!
Go to Solution.

bombay wrote:
Yes. It can be done. But Math script can not evaluate all functions in .m files (There are some exceptions).
And those can perhaps easily be ported to LabVIEW/MathScript?
It is not sufficient to disregard running your Matlab code in LabVIEW based on a few exceptions without first thoroughly evaluating the impact they have.
If you want to stick with Matlab in your implementation, then there are other avenues than hypotethizing about the limited portability issues of using MathScript in your project?
Br,
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Problems of integrating Matlab functions in Labview

Hi,
Does anyone know how to completely integrate Matlab functions into Labview program without a copy of Matlab in the system when I run the entire program?
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Cheers,
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hi smercurio,
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Cheers,
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Matlab script in Labview

Hi there,
I want to integrate my Matlab script in Labview,
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Bye for now

hi chris .. thanks for the reply ...
here's the results from 'ver
MATLAB Version 7.0.1.24704 (R14) Service Pack 1
MATLAB License Number: 227039
Operating System: Microsoft Windows XP Version 5.1 (Build 2600: Service Pack 2)
Java VM Version: Java 1.4.2_04 with Sun Microsystems Inc. Java HotSpot(TM) Client VM
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Version 7.0.1      (R14SP1)
Simulink
Version 6.1        (R14SP1)
Aerospace
Blockset
Version 1.6.1      (R14SP1)
Bioinformatics
Toolbox
Version 1.1.1      (R14SP1)
CDMA Reference
Blockset
Version 1.1        (R14SP1)
Communications
Blockset
Version 3.0.1      (R14SP1)
Communications
Toolbox
Version 3.0.1      (R14SP1)
Control System
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Version 6.1        (R14SP1)
Curve Fitting
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Relations between Matlab structures and LabVIEW clusters

I have a DLL created with Mathworks COM Builder, used as an ActiveX component in LabVIEW. Thus, I am able to have my Matlab functions inside LabVIEW. However, I have a problem regarding the pass of parameters between Matlab and LabVIEW.
When the Matlab functions parameters are simple -DBL, DBL arrays, strings-, there is no problem. LabVIEW does the right translation. But I have not been able to pass a Matlab structure to LabVIEW, which counterpart I think it would have to be a cluster. To solve this situation I need to split the structure components and pass them separately.
Does anyone know how to do it without the workaround?
Thanks in advance and have a good day,
spj

Hello Tishu,
1)       Can we use nested for loop in Mathscript node?
1) Yes you can. Remember that loops should be avoided as much as possible in m-scrips. Most of the times you can use vectorization to represent same task.
2)       Which one of these is feasible: 1) Matlab script node
                                                          2) Mathscript node
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3) Real time is different depending the application. Some applications need ns or ps real time (RF appls) others need seconds delay. Real time means "determinism". That a task will execute in a know time with little jitter. Windows is not a real time OS therefore nothing in it will operate in real time. Can you tell us something about the signal your are processing (Audio, Image fps, Radar)?
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For i=1:inf, 4) Is this vector a valid one? inf = Inf which is different from 1/eps.
Y= X-1;
end
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Such code does not produce output (Y variable) in real time processing.
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Gerardo O.
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Calling a VB Script and Matlab code from LabVIEW GUI.

Hi,
Can anyone help me out in Calling a VB Script and Matlab code from LabVIEW GUI? GUI will be developed in Labview and currently we have some scripts written in VB and Matlab and we need to incorporate the same through LabVIEW. Can anyone let me know how this can be implemented?
Regards,
Sharmash

For VBScript you can call the Windows Scripting Host application using the System Exec function, or you can use IScriptControl, which is an ActiveX control. Be aware that with the IScriptControl there's a small bug. You can read more about it in this post.
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Matlab routine within labview cannot get input after a few hours of use. What can be the trouble?

I have a Matlab-within-Labview application that needs to run 30-40 times in a row. However after let's say 10 runs I get error 1047, that is, there is no communication between Matlab and Labview. I have to reset the computer to start re-running the application without problem. Note that Matlab is open on this computer all the time.

Hello,
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Creating .mat files with Matlab dataplugin in LabVIEW

I am trying to create a .mat file in LabVIEW using the Matlab dataplugin. It appears to create a group called "Vector" without being told to, and it also concatenates group and channel names together. I have made an example to demonstrate this behaviour. I am trying to create a group called "Group" and inside it a channel called "Channel". What I get looks like a group called "Vector" and inside it a channel called "GroupChannel". What am I doing wrong?
Best Regards,
John Sackett
Solved!
Go to Solution.
Attachments:
write mat example.zip ‏54 KB

Hello John
Thank you for getting in touch regarding your issue. I am an applications engineer here at National Instruments, as I understand you are using the data plugin for Matlab within LabVIEW, but as shown with your code when you label the channel or group you get an outcome which you don't expect.
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Running matlab mfile in labview 8.2

Hi
i am working in a project using basically labview 8.2 and i wrote a program in matlab R2008(m file)and i want to run this file in my labview program; i also load this program into mathscript window but it didn't work because the m file contains many functions; i was wondering if you can please help me in this manner.
looking forward to recieving from you
Solved!
Go to Solution.

worked ok, with me... attached image shows your script, copied and pasted into a mathlab formula node, and the program running asking for the xls file.
did you get that far? if you did, send us the xls so we can go on testing more
Do you not have the mathlab script formula node? should be in Mathematics>>scripts and formula nodes>>mathlab script node.
(if you don't have it please tell me)
Attachments:
Dibujo.jpg ‏120 KB

Problem in creating the simulation dll using SIT 2.0.3,matlab 7.1,labview 7.1

I am currently using SIT 2.0.3 ,using this toolkit i am trying to create the simulation DLL for labview.but i am getting the following error in matlab command window
Error: File: C:\SimulationInterfaceToolkit\ModelInterface\basic.tlc Line: 117 Column: 7
Undefined identifier ReleaseVersion
Error: File: C:\SimulationInterfaceToolkit\ModelInterface\basic.tlc Line: 117 Column: 25
The == and != operators can only be used to compare values of the same type
Error: File: C:\SimulationInterfaceToolkit\ModelInterface\basic.tlc Line: 260 Column: 26
Undefined identifier ReleaseVersion
Error: File: C:\SimulationInterfaceToolkit\ModelInterface\basic.tlc Line: 260 Column: 44
The == and != operators can only be used to compare values of the same type
Is this a version problem?
I am using
Simulation interface toolkit 2.0.3
Matlab 7.1.0.246(R14) Service pack
Real time workshop V.6.3
Labview 7.1
Microsoft visual C++ 6.0
Can anybody help me to solve this issue.

Hi Jayasheela,
Here are the Read Me files for different versions of Simulation Interface Toolkit. Usually, the toolkit will only work with the versions of software that are explicitly stated.
Simulation Interface Toolkit 3.0 Readme
The MathWorks, Inc. MATLAB® / Simulink® application software release 13.x or 14.0, 14.1, 14.2, 14.3
The MathWorks, Inc. Real-Time Workshop® release 13.x or 14.0. 14.1, 14.2, 14.3
Microsoft
Visual C++ 6.0. You can use Microsoft Visual C++ .NET 2003 only if you
installed the LabVIEW 7.1.1 maintenance release.
National Instruments LabVIEW Real-Time Module 7.1.x for ETS Targets.
(Optional) National Instruments LabVIEW FPGA Module 1.1.x, for customized FPGA VIs used in real-time simulations involving FPGA devices
Simulation Interface Toolkit 3.0.1 Readme
The Simulation Interface Toolkit (SIT) 3.0.1 updates SIT 3.0
to support LabVIEW 8.0, the LabVIEW 8.0 Real-Time Module, and the
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Simulation Interface Toolkit 3.0.2 Readme
The Simulation Interface Toolkit (SIT) 3.0.2 updates SIT 3.0.1
to support LabVIEW 8.2, the LabVIEW 8.2 Real-Time Module, and the
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This maintenance release also adds support for the following products:
The MathWorks, Inc. MATLAB® / Simulink® application software R2006a.
The MathWorks, Inc. Real-Time Workshop® R2006a.
If you install SIT 3.0.2 for LabVIEW 7.1, you can use
Microsoft Visual C++ 6.0 to convert models to model DLLs. If you
install SIT 3.0.2 for LabVIEW 7.1.1, 8.0, 8.0.1, or 8.2, you can use
either Visual C++ 6.0 or Visual C++ .NET 2003.
Simulation Interface Toolkit 4.0 Readme
The MathWorks, Inc. MATLAB® / Simulink® application software release 13.x, 14.x, or 2006a, 2006b, 2007a
The MathWorks, Inc. Real-Time Workshop® release 13.x, 14.x or 2006a, 2006b, 2007a
Microsoft Visual C++ 6.0 or .NET 2003
You can also take a look at this KnowledgeBase article, which condenses some of the previous information.
MATLAB®, Real-Time Workshop®, and Simulink® are the registered trademarks of The
MathWorks, Inc. Further, other product and company names mentioned herein are
trademarks, registered trademarks, or trade names of their respective companies.
Amanda Howard
Americas Services and Support Recruiting Manager
National Instruments

Matlab R13 vs Labview v 7.1

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