engEvalString source code, Matlab

Hello, I'm looking for the source code for the engEvalString function in matlab. I need to see what this functions doing and possible change it to get it to do what I want. The functions found in engine.h but there’s nothing really there. When you use this to call something from Java it converts everything to doubles, and I need to be able to cast it to other values. I've googled for a little bit and I didn't run across anything. I’ve even searched for it in my matlab directory. I didn't know if anyone here knows where I can look. Thanks!

Answer 1

[Kaustubha Govind]

engEvalString is defined in the shared library or DLL named "libeng" - engine.h is simply where the declaration resides. The function is IP-protected, so you can't modify it, but feel free to create your own wrapper to do the required type-casts before calling into engEvalString.

[Jan]

I still do not understand your problem. Do you want to modify the inputs or outputs of engEvalString? I cannot imagine any scenario where modifying engEvalString itself could be useful.

[Kaustubha Govind]

Lucas: You need to use:

engEvalString('Engine *', 'In1=int32(10)');

To create In1 as an int32 variable. By default, MATLAB uses double datatype for statements like "x=2" - this has nothing to do with engEvalString.

[Jan]

You can post pictures in this forum. See e.g. http://www.mathworks.com/matlabcentral/answers/243-how-do-i-post-a-picture-with-my-question

Do I understand correctly that your problem is an unwanted conversion to DOUBLE in a Simulink model? Then your problem does not concern engEvalString at all, but casting in Simulink?

[Jan]

@Kaustubha: What is IP-protection?

[Walter Roberson]

@Jan: in this context, "IP" is "intellectual property" -- that is, the routine is unpublished internal MATLAB code that Lucas will not be able to get the source for.

[Jan]

Thanks, Walter! I've been confused by the large number of terms abbriviated by "I.P.".