MATLAB coder - can't get the 'coderand' .exe to work correctly
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michael brewin
am 4 Mai 2018
Kommentiert: michael brewin
am 11 Feb. 2019
Hi. I'm running MATLAB C-coder for the first time, running through the 'coderand' example.
https://uk.mathworks.com/help/releases/R2015b/coder/ug/ standalone-c-c-executables-from-matlab-code.html
It works to produce C source code, (which is not overly clear) a MEX file and an executable. The MEX file works fine
Trial>> coderand_mex
ans =0.2785
Trial>> coderand_mex
ans =0.5469
Trial>> coderand_mex
ans =0.9575
but the .exe file doesn't seem to work, running inside MATLAB or a DOS cmd window. It produces the same number each time its ran
C:\ALL\SOAR\MATLAB_DEV\coder_play>coderand.exe
coderand=0.814724
C:\ALL\SOAR\MATLAB_DEV\coder_play>coderand.exe
coderand=0.814724
C:\ALL\SOAR\MATLAB_DEV\coder_play>coderand.exe
coderand=0.814724
I set the tool t build for MATLAB Windows Host and the Compiler to MinGW64 (I know this can cross compile too), but say it was creating a Linux binary, I would expect a .bin file output and I would not expect it to run.
(i) Can somebody explain what settings I have missed or wrong. (ii) Can somebody explain the some basis to the source code generation, I know that generating 'true' random numbers is something of a science topic The .exe produced is 61K, I would expect something a lot less.
(iii) It would be re-assuring if this example included some output too. I have covered many aspects of MATLAB & its toolboxes and add-ons in recent weeks and this is the first time that I've fully stumbled
Thanks, Mike B
4 Kommentare
Jan
am 16 Mai 2018
You do not have to bookmark the "Contact Us" link, because you find it on all pages of the MathWorks sites.
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Jan
am 16 Mai 2018
To get a documentation about rand, see doc rand. At the bottom there is the link: Why Do Random Numbers Repeat After Startup?. There you find the example:
If you want to avoid repeating the same random number arrays when
MATLAB restarts, then execute the command,
rng('shuffle');
Insert this before r = rand().
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