Is it possible to call external matlab functions from a tlc file?

I have a Level-2 Matlab S-function that calls a great number of other matlab functions in order to perform a routine. It is a lot of code and I wonder if is possible to do a wrapper for a level-2 matlab function or if is possible to call those functions (the ones originally called from my Level 2 S function) from the TCL file. I know this is possible with C Sfunctions, but I have not find anything about doing it with matlab.|

Answer 1

[Titus Edelhofer]

Hi,

no, this is not possible. It would not make too much sense anyway: you need the .tlc file for code generation, but you would need to convert the MATLAB code called by your S-Function into C code in some way ...? Depending on your release you could use an Embedded MATLAB Function block or MATLAB Coder to fulfill the task ...

Titus

[Titus Edelhofer]

One point missing: in tlc you can evaluate MATLAB functions to support the process of code generation, see for "FEVAL" in the Target Language Compiler, section "TLC Build-In Functions". But in the generated code you can't use a MATLAB expression, because the output of tlc is C, not MATLAB.

[Xenoepist]

First of all, thanks for your prompt answer.

Not directly, but is it possible to compile my "*.m" functions using matlab's "mcc" command and then call the compiled "*.exe" functions from the TCL file? Or is there another way I can compile the S-function without rewriting all my matlab external functions.

[Xenoepist]

Ok, I just discovered Matlab Coder. It transforms matlab code to C. I made a test function that multiplies 2 intputs [ gain(num1, num2) ] and returns the result. IE gain(2,3) returns 2*3 = 6. After compiling the function and trying gain_mex(2,3) it returns 6 as expected :). Now, when I try:

%implements "wrapping" "C"

%function BlockTypeSetup(block, system) void %openfile buffer extern real_T gain(real_T mul, real_T k); %closefile buffer

%<LibCacheFunctionPrototype(buffer)> %endfunction %% BlockTypeSetup

%function Outputs(block, system) Output /* Multiply input by two */

%assign rollVars = ["U", "Y"]
%roll idx = RollRegions, lcv = RollThreshold, block, "Roller", rollVars
 %assign k = 4
  %assign mul = 3
  %<LibBlockOutputSignal(0, "", lcv, idx)> = \
  %<LibBlockInputSignal(0, "", lcv, idx)> * gain(%<mul>,%<k>);
%endroll

%endfunction

I tried to compile the model and it gives me an error and matlab does not give detail. It just says: Error(s) encountered while building model "untitled"

[Xenoepist]

of course I am half assleep and this is not going to work because the function is inside "codegen/lib/gain" folder. How can I call the C function that is placed in another folder? I tried

...extern real_T codegen/lib/gain/gain(real_T mul, real_T k); ...codegen/lib/gain/gain(%<mul>,%<k>) (just adding the path) but it didn't work :/

[Titus Edelhofer]

I'm coming back to the last part of my answer: have you thought about using the MATLAB Function Block? The code in there get's compiled to C-code without the need to write a .tlc file ...

[Xenoepist]

Well, the problem is that the function I'm going to be using is already made and it is very long and complicated. It is divided into smaller ".m" matlab functions. What I want to do is compile each ".m" function into a ".c" function and call each function from my "S-function."

The other problem that I have is that my professor won't even show me the ".m" functions until I've learned to call ".c" functions from the TLC.

The function that I used in the example is not the one I need to compile. It is just a simple one I made to understand more complicated ones.

[Sameer]

Hi

Did you managed to solve the issue??

If yes then please guide as I am having the same trouble.

Regards