MATLAB R2007a to Mathscript
I wrote the MATLAB code to produce a square at a certain frequency to 0.01 seconds. The code performs a loop then back to produce a similar squares but at a different frequency and it then concatenates up to the end of the first square. There are 100 these iterations as she founded a square of frequency change that runs for 1 second (or 0.01 * 100). I want this squares with the computer output speakers.
The code works in MATLAB, but when I copy in the window of Matchscript it does not work. The commands I use seem to be compatible with Mathscript and it seems that the problem happens at the stage of the loop. My MATLAB code is pasted below and I join the LabVIEW VI with my Mathscript window. Could someone please take a look at my code and see if I am missing any common questions? I am a new user of LabVIEW and am not completely familiar with its intricacies.
sample rate = 40000;
Step = 1/sampling rate;
freqArray = [5247.819345 2691.190023 2379.575143 2242.862777 2162.605492 2105.101801 2056.973700 2011.841157 1966.260707 1918.191205 1866.327910 1809.784986 1747.934921 1680.325561 1606.638751 1526.672983 1440.340700 1347.674817 1248.840788 1144.151306 1034.080952 919.278207 800.572260 678.972385 629.941608 670.923135 706.090004 733.248856 750.729600 757.468401 753.055128 737.746864 712.449234 678.666661 638.422079 594.147026 548.544635 504.430794 464.562051 431.461673 407.256955 393.540721 391.268089 400.696344 421.371792 452.163428 479.456733 499.635983 519.683091 539.345489 558.379030 576.550816 593.641724 609.448655 623.786494 636.489853 647.414604 656.439263 663.466274 668.423222 671.264030 671.970137 670.551695 667.048751 661.532385 654.105760 660.331784 659.175196 658.042926 656.973398 656.008980 655.196461 654.587596 654.239768 654.216768 654.589753] [655.438402 656.852357 658.933014 661.795790 665.573014 670.417674 676.508334 684.055673 693.311331 704.580088 718.236954 734.751698 754.724945 778.942900 808.463177 844.755078 889.940437 947.233277 1021.807261 1122.692006 1267.554308 1497.662150 1946.857495 4694.713066];
z = [ ];
T2 = ;
for n = 0:99
t = (0 + (0.01 * n)): step: (0.01*(n+1)) - stage;
y = (square (2 * pi * freqArray (n + 1) * t) + 1) / 2; % VL creation at different frequencies
z = [z, y]; % is concatenate matrices
T2 = [t2, t]; tables of time CONCATENATE %
Plot (T2, z)
Sound (z, 40000, 16)
Remember that table in MathScript indices are 1-based, so change the for loop statement "for n = 1/100' should do the job. It can be a little confusing because array indices are based on 0 in native LabVIEW, so you must make sure to add or subtract 1 during the back and forth between LabVIEW code and MathScript code.
Tags: NI Products
There were a number of comments about Mathscript and MatLab throughout the area of web pages, but I wanted to just ask a few pointed questions that likely should be easy to answer so that I can be sure my needs will be met with the add-on MathScript. So now,
(1) one of my colleagues has some programs written by some of the students is no longer with his lab to be able to pack up and send some of his colleagues in different universities who perform the same research, such as it is. The courage of the LabView programs is in the MatLab code; He MatLab and can run them, but external colleagues likely will not. I guess the Mathscript Module will allow me to:
___a) transfer the MatLab Code MatLab lymph nodes MathScript and have the same functionality (it does not appear to be an advanced MatLab functions in there, but it's long makes me not want to re - write in graphical programming LabView)
___B) create an exe file of these programs with my Application Builder without the need for MatLab or other processing engine must be installed on the destination computers
Is this the case?
(2) one thing I noticed on the code MatLab in these programs is that it seems to be variables that are created in a single node and are then called in another (without linking to them via cables which is what I'd be used to it). Is this standard 'persistence' for the use of MatLab nodes and Mathscript has the same functionality? Never used these so I wasn't sure.
That's about all. I just wanted to be sure before that I go ahead with this option.
I took a peek at your code and managed to implement your code with a MathScript window. Only, I've declared the variable in each node and has been able to run the VI. The warning, seen in the image below stating when you use global variables with the MathScript node, your code may run more slowly than normal.
With respect to the use of the Matlab Script node, I don't know if this would work because this node calls into orders Active X of Matlab, which I'm not too familiar with. The Matlab script node does not have an engine that runs in the background, it is actually calls to Matlab and the user must have Matlab installed on their computers to use the Matlab Script node.
From what we have discussed, I would like to use the MathScript node for your application so that your end user must only installed LabVIEW runtime engine to run an executable file.
I tried to do the matrix * vector multiplication in the Mathscript node cross-checking, but it seems it does not work. (In Matlab only)
If it is not possible to do, I should then repeat the vector to have the same number of rows in the matrix, but I don't know how to do either. Could someone tell me the equivalent of 'repmat' (Matlab) in the Mathscript node? To make a vector = 1, 2, 3 in 1, 2, 3 = matrix; 1, 2, 3; 1, 2, 3; ...
repmat in labview mathscript node: the following syntax works:
AUX1 (:, Ones (5,1))
I the student of LabView 8.5.1 version and experiences a lot of instability when you use Mathscript in Labview (the Mathscript block or the Mathscript window), but only when it comes to the larger scripts. The Matlab script is about 250 lines long and 16 KB of size and in this framework, are seven large paintings (six 14 x 8, built at the beginning and a 1000 x 9 which is built in a loop for, so increases with each iteration until 1000 lines). I find that whenever I have modify the script in the Mathscript node or the Mathscript window will freeze and hang for at least 10 minutes, sometimes totally crashing Labview Labview. As I wrote the script in Matlab, I'll have to debug in Labview and know what commands in Matlab do not work in Mathscript/Labview, so it's obviously pretty infuriating to have the program regularly hang for 10 minutes at a time.
The computer I use is a desktop Packard Bell 5 year with 768 MB of Ram (less 32 MB integrated graphics card), running XP Pro. The processor is an Intel Celeron 2.6 GHz. I appreciate this isn't the best specced machine ever, but at the time it was all I could afford!
Is this common suspended a little problem with Labview and Mathscript file ".m" large, or is manipulation - this purely down to my old computer?
Thank you much for the help.
The delay that you experience is a problem with the big scripts in MathScript. The delay increases exponentially with the length of the script. For this reason, we recommend disaggregation great scripts and files ".m" in rooms separated by about 40 lines. On faster computers, you can find the acceptable period for up to 100 lines.
Staff software engineer | LabVIEW Math & Signal Processing | National Instruments
I have a generic question about whether it is possible to call functions that belong to non-standard MATLAB of MathScript box. In particular, I have the interface for communication with a web server using the Toolbox of Matlab WSDL and I have a pretty "as what", or with minimal changes, in a fellow engineer Labview module so that the instrument can send data to our centralized, system that uses SOAP as the interface.
I prefer not to use if possible native SOAP of Labview modules.
You actually talk to the node in Matlab? MathScript is version or a language similar to Matlab. There is a MathScript node and a node of Matlab. The Matlab node called Matlab code using ActiveX server of Matlab. As such, it requires that you have Matlab installed on the computer. While MathScript is similar to Matlab, and Matlab code can be run "as-is" in the MathScript node, there are many differences (particularly with certain functions provided). The differences would be in the documentation. The MathScript node does not call for Matlab code. However, you can call a shared library MathScript. You must compile your Matlab code in a shared library using the Matlab compiler. The target machine would need to have the execution of Matlab engine.
I do the signal processing on a signal acquired with an ADC. The flow of information is roughly 10,000 x 1000 int8 Matrix per second. I'm trying to process the data at the same speed. Signal processing is done in a ".m" matlab file. The treatment is much to complicated to be coded in the G code.
I have two choices:
1. use matlab nodes
2. using the Mathscript node.
I've implemented the solution 1, but loses a lot of time just for the transfer of data between labview and matlab (matrix transfer ~ 10 MB). MATLAB is very quick to do signal processing. A faster version of this solution was to write the matrix in a bin file and pass the name of the file to matlab. It is faster (don't ask me why), but is not fast enough.
Solution 2 sounds better, because as Mathscript is a native language, it is not necessary for the transfer. Prior to joining Mathscipt, I did the following test: run the same simple code on two solutions: calculate the fft of a matrix of 1024 x 1024 ten times (code attached).
As a result, Matlab version node is 0. 5s compared to 1.6 s for the Mathscript node version.
Why is the performance of mathscript so much less than the performance of the matlab node?
If really Mathscript is much slower than Matlab, so I'm afraid I'll stay with node of matlab. Is there a better way to transfer data through files?
Thanks in advance for your answers!
You do not know, I can help you, but I found the same thing.
I have a few guesses - do you use 64-bit Matlab? If so you may have noticed that MathScript runs under 32-bit LabVIEW.
The other possibility is that Mathscript runs as a process integrated into LabVIEW, while if you use MatLab you use Simulink to communicate with Matlab in its own thread.
Third option could simply be that Matlab is a commercial product that is much more optimized.
Honest answer is that I don't know!
I have a question about the m-script function call (MATLAB) in Mathscript Labivew 2009. I have attached my buggy vi for an example:
1. I called a function 'remodel (Sigma0, [O O Q M])"in Mathscript, it gave me a syntax error, but not in Matlab R2009b. I guess that it does not tolerate a great deal of input parameters. Any idea as how use the reshape feature in Mathscript?
2. Another problem is that I've defined a function m-script with 2 parameters, in Matlab, I can call the function with a single parameter provided, however in Mathscript, system reports error if I only provided 1 parameter to a function of 2 parameters. Any idea as how to cope with this problem?
Because I have a lot of code in the format m-script, I don't want to rewrite a lot of new code.
Thanks for any help.
Indeed there is a small difference in the matlab function and labview mathscript reshape function reshape. The difference is that Matlab is considered always any 2D array from the perspective of lines... where LabView considered from the perspective of columns... that is, if a table 2D likeX = [has and b, c and d] is here and the (x, 1, 4) reshape in labview will give out like a, c, b, d in an array, matlab, the output will be has b, c, d in a table.
And in Labview syntax you gave will certainly give a syntax error. Please visit the labview syntax help.
Thank you and best regards,
I've been searching the forums all morning and have not found what I'm looking for. I have found information, you mind, but it seems that I'm smart enough now to put all the pieces together. So I'll just ask, and we hope for the best. Maybe someone can point me in the right direction... everything is blurred together at this stage.
Is there a relatively simple way to run a bilinear transformation in LabVIEW without using Matlab or MathScript? I don't have access to either one. If there is a built-in function of LabVIEW, I'm not find it.
The MathScript code looks like this:
W3 = 2 * pi * f3;
B = [1/w3 1];
W4 = 2 * pi * f4;
A = [1/w4 ^ 2 1/T4 1];
[b, a] = bilinear(B,A,fs);
Since you're using the representation of transfer function you will need to do the transformations and representation of the State space and perform the bilinear transformation in the meantime. Normally, it's hard to make from scratch, but LV has the built-in Polynomial.vi feature so it's pretty easy (once you get the right formula).
StateSpace <->transfer function screws that I have used it before so I think that they are correct. Bilinear transformation was just thrown together using mathworks.
I would like to know how to train a neural network in Matlab and use it in Labview? I know I should be using the MathScript, but as I do once the network formed in matlab is a dull file?
Well, it's not all MATLAB code/script that can run in LabVIEW using MathScript.
If there is a function of IP (intellectual property) in the code, that is, any Toolbox MATLAB functions, you won't be able to execute it using the MathScript.
In fact, you must call the MATLAB script node in your code. This node calls the script software MATLAB server to run scripts written in MATLAB language syntax and are only available for windows.
Try encoding using the MATLAB script node and tell me if it worked for you.
I need to use random variables inside a Matlab Labview Commsuite node. I generate with the randn() function. Is it possible to put the seed of the random number generator such as the random numbers are reproducible?
You can use randn ('seed', seeds) to initialize the random number generator. The seed must be a positive integer value. For example, randn ('seed', 3). In addition, this seed is global within the entire application. This means that if the randn() function is called MathScript multi-node that could run in parallel, random results are not guaranteed to be the same after you change any part of your code. But you should always get the same results for repeated passages of the same code.
Hi iam new to labview and learning n do labview project
What is the difference between mathscript and matlabscript
I want to do the simulation using matlab
How can I do
If one suggests this
Please answer and provide assistance so that I will perform my project...
With the LabVIEW MathScript node, the blue rectangular region, you
can run scripts from files ".m" of your graph (known as LabVIEW programs
virtual instruments or screw). You can use the MathScript node
to insert text algorithms in a VI and then use the LabVIEW
environment of graphical programming to instrument the scripts by adding
buttons, sliders, buttons, graphics, and other user controls and
MathScript nodes lie down, I need to be able to make temporary annotations on paper. Currently, the only way I can find to print the MathScript node is by screen capture and printing an image.
While I can copy the text and put it in a word processing program, I would lose all the useful color coding.
Y at - it a tip to copy as text and preserve color-coding?
Download and install the notebook of the programmer.
Copy all the text of the Mathscript node and paste it into Notepad to the programmer.
In the menu bar - view - check syntax highlighting
In the menu bar - display - regime change - select Matlab
In the menu - Tools - Options - fonts and colors - bar you can select a larger font size
(Although my vision is corrected to 20/10 and I have a lot of difficulty to read tiny fonts in the Mathscript node on a screen high resolution after a couple of hours.)
This software is free and has a full set of features for serious programmers.
I have a lot of screws that must be built into executables. So, I think to write a script to save time.
Windows MathScript looks a lot like the command window in MATLAB, so I wonder if there is a way to create executable files using mathscript?
Or is it possible to build from the windows command window?
Thanks for your reply and have a nice day.
You can use the tools in the palette of constructor calls write a LabVIEW program to automate the construction of applications.
(Somehow I don't understand not what you want. Building is usually negligible compared to write the program or the configuration of the build).
I searched all the 12 pages of this forum and this solution is not found. If this is a repeat, I am sincerely sorry.
I try to use the MathScript matlab Module "eval" and 'num2str' orders. For example:
II = 01:10;
eval (['w' num2str (ii) ' = ii ;']);])
The problem is that 1) it says that it will slow down the program (I get only) and 2) it does not seem to run the script. I'm looking for some 'w' matrices/vectors/scalars as output.
In addition, as part of the script that I have other variables that I would use as output. When I try to add them, labview stipulates that: "you must set this variable in the script and then set its data type. I get the output variable: right click--> Add out--> click variable. Even variables that are not used in the script I want to pass give the same error.
input variables x = y z
II = 1:x
eval (['y' num2str (ii) ' = ii ;']);])
output (by above method) variables will show all three, but even with just passing through "z" I get this same error.
This error does not appear when I do basic math in the node and pass the unused variables.
Ideas, suggestions, solutions would be appreciated. If necessary I can post some of my code; However, I gave the relevant information above.
Can the Mathscript in Labview 8.5.1 feature manage pictures 3D and process the data accordingly? All berries are generated in the Matlab script, analyzed and processed as required 1 d numbers and individual issued to Labview.
At that time, MathScript can not handle 3D tables (either internally or when interfacing with LabVIEW). We are aware of the limitation and would like to support in a future version. Is it possible to achieve what you want with several 2D arrays?
Staff software engineer | LabVIEW Math & Signal Processing | National Instruments
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