Mathscript node and mathlab

Hi guys
I need to convert some program from mathlab to LV.
However, I have little idea which to node to use.
So, i will have a few question for u guys
1) Because I m a lazy person, I dun wan to start to write the code from scratch in LV.
I heard about

Hello Sir Knight AltenBach:
Some comments on capabilities of MathScript versus Matlab and recently the
new ScieLab 5.2. I started using it for LV8.2 for work involving quantum noise statistics in image sensors . Although it has increased more analysis functions and speed for each new LabVIEW release, there are serious limitations of this tool. So its probably only good as some small code insertions between codes for hardware calls for processing signals when they become available as arrays. First, "not all functions is supported in LabVIEW Runtime" e.g. get (), set () etc. so scripts stays as long as LV Development environment stays with it to execute it. Second is - it still does not support "multi-dimensional arrays" - consider for example converting an RGB image to an array in LabVIEW and wiring the result as input node array here [nn,mm,nc] = size(array); can't work but [nn,mm] = size(array); don't receive a complain - in other words we can't go beyond 2D array math with MathScript. The third, is Mathlab will not work entirely with calls to Matlab or Scielab toolkits (Scielab nodes only works on LV8.0 to 8.2 for lower than 5.2) . So m-scripts should be written carefully inside these nodes! Forget cell arrays {}, forget structs, forget multidimensional arrays. Fourth, is that you can define m-functions and actually execute it but only on a MathScript Window, you need to actually wire in every text on the script inside a MathScript in a new VI identifying all the entries and exit node variables to connect to. If your trying to save ~USD$5K for a Matlab license and felt you need to do it in "hybrid style programming" interfacing the IO instrumentation capability of LabVIEW with the efficient array processing in Matlab - you probably need to work with them together anyway because you need to cut and paste every command you did in Matlab to the command window of MathScript - type help for each keyword built-in function and observe how they behave if at all they do the same thing or not.
Bernardino Jerez Buenaobra
Senior Test and Systems Development Engineer
Test and Systems Development Group
Integrated Microelectronics Inc.- Philippines
Telephone:+632772-4941-43
Fax/Data: +632772-4944
URL: http://www.imiphil.com/our_location.html
email: [email protected]

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Move code between MathScript Node and MathScript Window

It seems like there should be some way to easily move between the MathScript Node, block diagram view and the MathScript Window.
All I can find is saving to a script and reloading in the other view.
Am I missing something?

Hi wildcatherder,
That seems to be the only way that I've been able to see to interface the MathScript Node and the MathScript Window.
Is there a particular reason you're switching back and forth between the two?
Regards,
Joel I.
Applications Engineer
National Instruments

Mathscript node and arrays

hello, I am new to LabVIEW, so I need ur help. I want to provide some controls to mathscript window and it has to output an array/matrix.. Please help me.

Raghavendra1 wrote:
hello, I am new to LabVIEW, so I need ur help. I want to provide some controls to mathscript window and it has to output an array/matrix.. Please help me.
You always choose datatypes for input and output, can you give little more info about your program or vi what exaclty you want to do.
check this also:
Developing Algorithms Using LabVIEW MathScript RT Module: Part 1 – The LabVIEW MathScript Node

MathScript Node in PPL

Hi,
I am trying to compile a Packed Project Library containing every classes in my project. What I did is I created a project library, added the classes in it and made a build spec for the PPL. I got an error during the build process saying that one of my VI used a MathScript node and that this couldn't be part of a PPL. So I removed the class containing this VI from the library, as well as the classes containing VIs calling this VI, and so on... But I still get the same error for that same VI when trying to compile the PPL. Why is that??

It sounds like there must be MathScript nodes left somewhere in the application.
Try opening one of the VI's and pressing CTR+F to open the Find Dialog. In there you can select the MathScript node as the object you are searching for and keep the search scope as "All VIs in Application Instance."
You also can try building a packed project library of smaller parts of your VIs to try and isolate what section may be causing the error.
Craig H. | CLA | Systems Engineer | National Instruments

Dynamically loading the MathScript Node

Hi - Is it possible to dynamically load script into the Mathscript Node at Run time. I see that you can use define functions and paths and things . But being a newbie to Mathscript could all this hang together to make dynamic loading a possibility and how?
thanks dht

Hi,
unfortunately the node doesn't support run-time dynamic loading of scripts. You can load variable values with the load function, but not scripts.
http://zone.ni.com/reference/en-XX/help/371361A-01/lvtextmath/msfunc_load/
http://zone.ni.com/reference/en-XX/help/371361A-01/lvhowto/saving_loading_scripts/
Depending on your application, you could use a case statement to decide between several pre-built (and possibly compiled) mathscript nodes, and acheive the functionality that way.
Another option might be to use the formula vi's instead, although this will require a more complex architecture to parse the text file you'd generate.
For more information on MathScript, please see the following link
http://zone.ni.com/devzone/devzoneweb.nsf/Opendoc?openagent&568C773718B080F286257096005BD314
Hope that helps
Sacha Emery
National Instruments (UK)
// it takes almost no time to rate an answer

Mathscript node: an internal mathscript error has occurred: 64-bit LabVIEW 2009

Hi Folks -
I have an installation now of
LabVIEW 2009 9.03f, Vision, and Advanced Signal Processing Toolkit, all
64-bit versions on a new computer so that I can convert some code from
32- to 64-bit.
I figure I will address errors
one-by-one and here's the first one. I have a VI with a mathscript
node and the VI, which loaded and ran fine in the 32-bit environment,
is now broken and giving the error "mathscript node: an internal
mathscript error has occurred." My main concern - is mathscript not
supported in 64-bit LabVIEW right now?
I am attaching the VI. Any ideas are appreciated. I need to get this working.
Also, NI, is there a special 64-bit forum that we should post to in the future, or create to post to?
Sincerely,
Don
Solved!
Go to Solution.
Attachments:
sort.vi ‏753 KB

From 2009 help
LabVIEW MathScript is a text-based language you can use to write functions and scripts. You can process scripts using LabVIEW MathScript in the LabVIEW MathScript Window or a MathScript Node. When you create a LabVIEW MathScript, you must use supported data types.
The MathScript syntax is an intuitive and logical
syntax predominantly based on standard mathematical and computer
programming terms, terms in widespread and common use, and/or
descriptive abbreviations, truncations and concatenations of standard
terms. The LabVIEW MathScript Window and MathScript
Nodes are able to process files you create using the current MathScript
syntax and, for backwards compatibility, files you created using legacy
MathScript syntaxes. The LabVIEW MathScript Window
and MathScript Nodes also can process certain of your files that use
other text-based syntaxes, such as files you created using the MATLAB® software. Because the MathScript RT Module engine is used to process scripts in the LabVIEW MathScript Window
and MathScript Nodes, and because the MathScript RT Module engine does
not support all syntaxes, not all existing text-based scripts are
supported.
(LabVIEW 64-bit) LabVIEW MathScript is not supported in LabVIEW (64-bit).

Mathscript node problem - specgram function of matlab

Hello...
I used to use "specgram" function
of matlab, in a M file builded to perform FFT spectral analysis in
signals. I am trying to build a VI to perform the same action.
In
a blank VI I created a Mathscript node and pasted the code of my M file
inside it. After adjust the input and outputs of the node, I run the VI
and received the Error message "Unknown symbol on line 7 : specgram"
How do I solve this issue? How do I execute the specgram inside the mathscript node?
Thank you in advance
Dan07

Hello Luciano...
-   First of all I use the “load” command to open an ASCII file into Matlab;
-   The ASCII file has 3 columns:
o   Column 1: Time Series
o   Column 2: 900 seconds of Signal 1
o   Column 3: 900 seconds of Signal 2
“After this point, all the operations were performed in the same way
to both signals, I will in the next steps talk about only one signal to
produce a short text
-   The Signal was interpolated by cubic spline interpolation using 10 Hz (one point each 100 ms);
-   The new sequence of values of the signal has 9001 values;
-   This new series was splitted into 34 segments of 512 points each, overlapped by 50 % (256 points);
-    Short Time Fourier Transformation was performed in each segment, using the specgram function of Matlab;
This operation resulted in 5 ascii files:
o   B: ascii file with 34 columns, each
column represent one segment and has the values that build the spectrum
of the segment - signal 1
o   C: ascii file with 34 columns, each column represent
one segment and has the values that build the spectrum of the segment -
signal 2
o   pi: ascii file with one column with 9001 interpolated values - signal 1
o   fi: ascii file with one column with 9001 interpolated values - signal 2
o   X: ascii file with 4 columns and 34 lines (one line for each segment), with mean and SD values for signals 1 and 2
I have already build a VI that generates the interpolated series of values and splits it as well, but using spectrogram function in labview I didn't get the same results (values) of specgram (matlab).
Thanks in advance
Dan07
Attachments:
Code.vi ‏16 KB

Is it possible to define a function in the MathScript Node

Is it possible to define a function in the MathScript Node

You can not define a function inside of a MathScript Node, but only because it isn't necessary. The way custom functions work in MathScript is that they are saved in .m files located in paths in the MathScript path list. When the MathScript compiler receives a function that it doesn't recognize, then it searches for it in the path list, and upon finding it, compiles and loads the function. You can specify these search paths manually by going to File>>MathScript Preferences from the MathScript Window or dynamically by using the path() command within a script.
To answer your original question, if you would like to create custom functions dynamically within a VI, then you can simply build your custom functions using strings and then save them to an ASCII file with the extension .m. You could either save the file to a path already in the MathScript path list or you could dynamically specify the path by passing the path into a MathScript Node as a string and by using the path() command at the beginning of your script to set it.
Kind Regards,
E. Sulzer
Applications Engineer
National Instruments

Calling a .m file from inside a mathscript node

hello all i am hoping someone can help me out, I am in the process of converting our version 7.11 matlab node vi's to mathscript (I hope) AND I HAVE RUN INTO AN ISSUE. we have a very simple matlab script that bundled the data and sent it to another matlab sub routine. when i copy this script over to mathscript I get the following eror: Unknown symbol on line 13: Pre_Process_Function_Pulse. Is there a way I can call and run these subroutines from the mathscript node? Do i need to convert the sub routines into a mathscript file? or do i just need to change the syntax for my call? bmp of the offending line in mathscript attached. please forgive if this is an easy question, I am not really a matlab programmer, the files that we are running are provided from elsewhere, and i get to integrate them any and all help is always appreciated thanks Chris
Attachments:
mathscript.JPG ‏51 KB

Hello again,
Ok I am still having issues running the matlab script in mathscript. I have gone back to the original scripts with all the nested sup routines. and the mathscript code is just a call to the first .m file subroutine. but for some reason mathscript will not recognize the function call as a call? I recreated the original matlab node in a sequence, so the matlab node runs (successfully) and then the next sequence is the identical call in mathscript. I have set the path in mathscript to the directory where all the .m files are located. The pre-process_function_pulse .m file sequentially calls 6 very small .m subroutine files. all are located in the same directory. and this directory is the only one listed under path and working directory in Mathscript preferences. Additionally from the last suggestions all traces of the original japanese comments have been deleted from all the .m files. The inputs and outputs are the same for the matlab and mathscript nodes. so i am basically at a loss here.
Any and all help will be greatly appreciated.
thank you
Chris
Attachments:
mathscript.doc ‏138 KB

How to call User defined functions in Mathscript Node ?

Hi,
I have created a user defined function and saved it to Search path of Labview as an M file. If I run my program in Math script window, the function is recognized and the program works properly. If I do the same with MathScript node , the user defined functions are not identified.
Kindly help me with this problem. Thanks in advance
Cheers
Lenord Melvix

This page may help:
http://zone.ni.com/reference/en-XX/help/373123C-01/lvtextmathmain/caveats_recommendations_ms_search_...
Kevin C.

How to use mathscript node in server side with the parameter from the client side

I tried to develop a server/client system with some algorithms written in matlab. So I included a mathscript node on the server side. The client will send the parameter to the server. According to these parameters, the sever will call the matlab functions to do some computings and then send the results back to the client. The server has to wait for all parameters received before the computings. How do I know this since I only connect the parameter variables to the inputs of mathscript node on the server. The sever cannot know whethere these parameters are the new ones or old ones since the client may send parameters multiple times?

It seems to me you have two perfectly good options to start with. You could send all possible parameters in a single packet from the client to the server. This could be in the form of a cluster or an array of values. If by server/client you mean you are sending data over the network, then you could flatten this data to string before sending and unflatten it on the other side. Since all parameters come in one packet, you know all the data is valid every time you send data.
The other option is to send the parameters individually, but include some extra information such as a timestamp or iteration count. The server keeps reading and storing parameter values until a packet arrives with the next timestamp. Alternatively, you could include some information such as an end-of-parameter-list boolean that is sent with every parameter. It would be false until the last parameter packet.
Give it a thought. There are lots of solutions.
Jarrod S.
National Instruments

How to implement a user-defined function in a mathscript node

I am trying to use a mathscript node that includes self-defined functions, but I always get an error. I tried to run an NI-example: MathScript using Riemann Zeta.vi ,and I got the same error I get when I run my own programmes:MathScript Node'MathScript Node' (zeta): User-defined function contains an error. I didn't change anything in that example, so what could be wrong?

Try the Mathscript forum instead. Good luck.
(Maybe start reading this, for example)
Message Edited by altenbach on 11-18-2009 01:48 PM
LabVIEW Champion . Do more with less code and in less time .

Changing a path dynamically in a MathScript node

I have inherited a MatLab script that must be run in LabView. The first issue I have is creating unique paths. When a Unit Under Test runs, its data will be saved to a file based on the serial number of the UUT. The MatLab script then analyzes the data from that file and creates a new file based on the serial number with a new file extension. Therefore, I need to read in a file whose path changes and write a file whose path changes. The relative path will be the same but the unique file will not. I am looking for suggestions on how to do this since there will be hundreds of serial numbers being tested. It would be nice if the node could have an input that could configure to a path or string type instead of a scalar only. The serial numbers will be apha-numeric and this must be able to exist as a stand alone application.
Also, the node reports a 'unexpected token: function'. I am noticing that functions must be a seperate .m file but how do you call the function after that?
I am using LV 8.5
Thanks - Jeff
Message Edited by j.masse on 07-07-2008 07:57 AM

Hello Jeff,
Creating unique paths is not difficult in MathScript. Simply pass in the string you want to use as the specific part of the path and have a local variable contain the base path. For example, if you have a string input named serial to the MathScript node, the following code will build a path:
basepath = 'c:\data\';
filename = [basepath serial];
You mention needing to do this for a large number of files. The easiest way to do this is to have your loop in LabVIEW and simply pass in one string at a time to the MathScript node to do your processing. If there is a lot of setup work involved before the work that needs to be done for each file, then it is more complicated. There really isn't a concept of an array of strings in the language. The closest you can get is a cell array containing many 1D character arrays. However, LabVIEW MathScript does not yet support this construct.
You can pass in a LabVIEW 1D string array -- the MathScript node input will adapt to the type wired to it. What it does is create a 2D character array in MathScript. If not all the strings are the same length, then it will pad the end of the string with zeros. This presents a problem when you try to use the string as a filename. However, you can use the strrep (string replace) function to replace the zeros with empty strings. For example, assuming you have an input variable named serial that is a 1D array of strings and a loop-control variable named index, type
basepath = 'c:\data\';
name = strrep(serial(index, : ), char(0), '');
filename = [basepath name];
You cannot write a function inside of a MathScript node. What you can do is create a .m file on disk and add the directory to your MathScript search path. The default search path is your "My Documents\LabVIEW Data" directory. But if you add the file elsewhere, there are three ways to set the search path for MathScript. First, from the MathScript Window, go to "File >> LabVIEW MathScript Properties" and click on the "MathScript: Search Paths" category item. This will set the search path for the MathScript Window only. Second, from a LabVIEW VI, go to Tools >> Options and click on the "MathScript: Search Paths" category item. This will set the search path for all VIs in the main application instance only. Third, from within the project explorer, right-click on "My Computer" and select Properties. Then click on the "MathScript: Search Paths" category item. This will set the search path for that context only. Since you are talking about using this in a built application, the third option will likely be what you need.
As for using a built application generally, as long as you avoid any MathScript function that describes itself as being unsupported in the run-time engine, you should be okay. The help for individual functions will list if they are unsupported. You can see a list of all such functions by looking in the LabVIEW help index for "MathScript" and double-clicking on the entry for "functions not supported in Run-Time Engine."
Grant M.
Staff Software Engineer | LabVIEW Math & Signal Processing | National Instruments

Convert MathScript node to regular wired diagram

I wrote a program last year in LabView 8.6, with some MathScript codes in it. But this year, after I upgraded LabView to 2009 Full Development System, I am not able to run this program anymore because I didn't purchase the MathScript Module. And what even worse is, when I wrote the program, I shrinked the script node frame too much in order to save some room, but now I cannot even drag the frame bigger. So now everything is hidden inside the script frame and I cannot see what's inside. Is there anyway that I can find out what's inside the script node so I can translate them to regular wired diagram? Thank you in advance.
Message Edited by Support on 03-04-2010 02:25 PM

Hello,
Unfortunately there's no way to see your code without MathScript being installed. This seems like an overzealous restriction, so I have filed a bug report (ID 211321) to allow resizing and exporting text in a future version.
In the meantime, I can think of two options. You could install the MathScript RT Module in Evaluation mode. This will let you try it out for 30 days for free. Or I'd be happy to copy the text from your nodes and post it on the forums. If you'd like me to do that, just let me know which VIs to look at in your ZIP file.
jattas
LabVIEW MathScript R&D

How to make a text based language in mathscript node executed faster?

Hello Everyone,
I have build a VI contains mathscript function node, due to the big data needs to run it takes long time to finish the execution, is there any way to make the process faster, such as building shared library so it can be called by call library function node, or this only valid for c and c++ .
any help will be highly appreciated

smercurio_fc wrote:
There is no way to convert the Mathscript code to a shared library.
Please post what you're actually doing in the Mathscript node. As Gerd noted, there's probably a way to do this using native LabVIEW functions.
While it may not be possible for a direct conversion from MathScript code to a DLL, it is possible to build a shared library using the application builder from a VI containing a MathScript node. This could be one way to get MathScript code into a shared library.
The application builder is included with LabVIEW Professional Edition. You can setup a shared library by going to the project explorer and right clicking "Build Specifications" and selecting New->Shared Library (DLL).
-K Scott

Mathscript node and mathlab

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