MATLAB: Am I receiving an error when I try to override a mex file with the -outdir option of the mex command

MATLABmexs-function

When I try to override a mex file with the following command

mex -outdir .\sfun -I.\moduls .\sfun\mysfun.c .\moduls\modul.c

I receive the following error:

 cannot open output file .\sfun\mysfun.dll:
 C:\MATLAB\R14SP2\BIN\WIN32\MEX.PL: Error: link of '.\sfun\mysfun.dll' failed.
 ??? Error using ==> mex
 Unable to complete successfully

Best Answer

This error will only occur if you try overwriting a MEX file that is currently being used by another application. This issue is not a bug and can resolved by:

(i) Ensuring that you have write permissions to the output directory.

(ii) Ensuring that the mex file is not being used by another application. You can confirm this by executing the following command:

clear mex

Related Solutions

MATLAB: Do I receive a “cannot open file ‘dformd.lib'” fatal error when trying to use the MEX command with the Compaq Visual Fortran 6.6 compiler

This error results from the Compaq Visual Fortran compiler not being installed with the proper file folder arrangement.

The recommended file arrangement for the Compaq Visual Fortran compiler is as follows:

 Developer Studio Files:  C:\Program Files\Microsoft Visual Studio\Common
 Visual Fortran Files:  C:\Program Files\Microsoft Visual Studio\Df98
 Shared Visual C++ Files:  C:\Program Files\Microsoft Visual Studio\VC98

For more information, see Hewlett-Packard's website on Fortran compilers:

www.hp.com/go/fortran

MATLAB: Mex

Hi,

I think the issue is raised in your switch statement when you open a file. You have a return in there, which leads to terminating the mex file without assigning the output variables. Change the return to a break and it should work.

In addition these line should generate a SegV:

plhs[1] = mxCreateDoubleMatrix(1,1,mxREAL);
      validity_out = mxGetPr(plhs[1]);
      validity_out[1] = validity;

Since validity_out[1] will access the second field in an array with one field only. This should be

validity_out[0] = validity;

The same applies on timestamp.

You dont need to apply mxFree on the xx_out variables. Since the weren't allocated woth mxMalloc and in addition they get deleted automatically when the mex function is finshed running.

Best Answer

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MATLAB: Do I receive a “cannot open file ‘dformd.lib'” fatal error when trying to use the MEX command with the Compaq Visual Fortran 6.6 compiler

MATLAB: Mex

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