Is it possible to write to a MATLAB workspace parameter from within a TLC file?

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David 2012-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/49578-is-it-possible-to-write-to-a-matlab-workspace-parameter-from-within-a-tlc-file

回答： Juan Reyes 2016-7-15

I'm generating a level-2 matlab s-function based on a m file and it is working perfectly since I'm able to modify workspace variable from m file.

However, when I generate code or simulate in accelerator mode, I need to provide a tlc file that does the same thing than the m file and I have hard time to do so. I'm not able to modify a workspace variable from the tlc.

I tried the following :

%assign b = FEVAL("evalin","base","var1 = 10")

But it doesn't work. It is based on the following post: http://www.mathworks.com/support/solutions/en/data/1-D4U5ES/index.html?product=RT&solution=1-D4U5ES

Thanks for your help.

David.

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Answer 1

Kaustubha Govind 2012-10-1

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编辑：Kaustubha Govind 2012-10-1

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I'm guessing this is not working, because you are doing the equivalent of:

>> b = evalin('base','var1 = 10')

When executed in the MATLAB command window, I see this error:

>> b = evalin('base','var1 = 10')
Error: The expression to the left of the equals sign is not a valid target for an assignment.

Try just:

%<FEVAL("evalin","base","var1 = 10;")>

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David 2012-10-2

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Hi Kaustubha,

You are right about the "b = evalin('base','var1 = 10')" not working. In fact I tried the following "b = feval('evalin','base','var1', '10')"which wasn't working either but no error.

Your suggestion seems to cause an error when generating code from tlc. Here's what I got with only your line in the output function of the tlc:

### Building the Accelerator target for model: two Setting environment for using Microsoft Visual Studio 2008 Beta2 x64 tools.

### Compiling two_acc.c C:\PROGRA~1\MATLAB\R2012b\bin\mex -c -win64 OPTIMFLAGS="/Od /Oy- /DNDEBUG" -f C:\Users\mslog01\AppData\Roaming\MATHWO~1\MATLAB\R2012b\mexopts.bat two_acc.c two_acc.c two_acc.c(33) : error C2143: syntax error : missing ';' before '{'

C:\PROGRA~1\MATLAB\R2012B\BIN\MEX.PL: Error: Compile of 'two_acc.c' failed.

NMAKE : fatal error U1077: 'C:\PROGRA~1\MATLAB\R2012b\bin\mex.BAT' : return code '0x9' Stop. The make command returned an error of 2 'An_error_occurred_during_the_call_to_make' n'est pas reconnu en tant que commande interne ou externe, un programme ex‚cutable ou un fichier de commandes.

### Build procedure for model: 'two' aborted due to an error.

If I comment the new suggested line it compiles.

Thanks.

Kaustubha Govind 2012-10-2

David: What exactly is the code generating around line#33 of two_acc.c? This file may be hard to read, so I would recommend performing a regular code-generation (Ctrl+B) and see if you can reproduce the same error?

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