Dynamically load script

Hi everybody,
Is it possible to load a different m file by browsing it once I have made an executable out of my LV program?
I'll try to explain :
I have 24 data acquisition channels on my bench and I want to make combinations between them (linear or not). I know I will have a maximum number of 5 calculated channels but I don't know neither which channels will be used as inputs nor what operation has to be made.
Example :
Ch_calc_1 = ch5*ch9; Ch_calc_2 = ch1+ch5 +ch8*ch15.
Ch_calc_1 = ch1+ch9+ch14; Ch_calc_2 = ch1*ch5 +ch8*ch15.
Ch_calc_1 = sin(ch9)+cos(ch12+ch19); Ch_calc_2 = ch1+ch5 +ch8*ch15
And so on.
I already know the number of inputs can not be managed dynamically and I think about a swhich (limiting number of input from 2 to 10). But I don't know how I can load a different formula when ever I want.
By the way, I do not necessarly need an m file. Using a simple text box on my front panel where I can directly type my formula would be good also.
Thanks for help.
Raoul Chodziesner-Bonne
Ingénieur Instrumentation
CRIL TECHNOLOGY - Groupe ALYOTECH
"Celui qui pose une question peut paraitre idiot sur le moment, celui qui n'en pose pas le reste toute sa vie!"

Hello Raoul,
The short answer to your question is no, it is not possible to load a different .m file in a built executable. Providing a text box for string input to the MathScript node will not work either.
The difficulty lies in the fact that MathScript is a compiled language. In order to create executable code from an arbitrary .m file, we would need to first compile it. This functionality is not provided in the run-time engine. This question comes up frequently and, honestly, we are a little puzzled as to the usefulness. Could you elaborate more about your application? What MathScript functions would you expect to be able to call? Would you need the performance to be similar to a compiled MathScript?
A simple workaround is to use a development version of LabVIEW at each location you would have used a built executable. The development version has the necessary functionality to do what you wish. You could have a string control on the front panel, pass in this string to the MathScript node, and call the "eval" function.
However, if you wish to use a built executable, there are a couple other workarounds possible. The first is if you can predefine the set of all possible computations you wish to perform. You can then write LabVIEW code to choose among them as well as provide a mechanism for ensuring the right channel data gets to the MathScript node. See the screenshot below and attached VI for an example of what I mean.
The other workaround is to use the LabVIEW formula parsing and evaluation VIs. These VIs are available on the Mathematics >> Script & Formula palette. These all take a formula string input that you can specify from a front panel control. However, these VIs do not provide as much functionality as the MathScript node.
Grant M.
Staff Software Engineer | LabVIEW Math & Signal Processing | National Instruments
Message Edited by GrantM on 01-23-2008 05:02 PM
Attachments:
select.png ‏13 KB
select.vi ‏1 KB

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If I may indulge you again, I've cleaned up the scripts according to your advice and made progress, but I am still receiving the following errors:
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=================================
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