MATLAB: Problem in running mex file

mex

Hello, While running mex file i am getting problem. I tried to run file in three ways
(I)First case i given the file path to run code
>>mex mex_find_epipolar_match.c MATLAB/R2010b/extern/lib/win32/lcc/libmwlapack.lib;
LINK : fatal error LNK1181: cannot open input file 'MATLAB\R2010b\extern\lib\win32\lcc\libmwlapack.lib'
D:\PROGRA~1\MATLAB\R2010B\BIN\MEX.PL: Error: Link of 'mex_find_epipolar_match.mexw32' failed.
??? Error using ==> mex at 208 Unable to complete successfully.
(II)second case i copied the library to current folder then
>>mex mex_find_epipolar_match.c libmwlapack.lib;
 Creating library D:\Users\sudhakar\AppData\Local\Temp\mex_ra3IPZ\templib.x and object D:\Users\sudhakar\AppData\Local\Temp\mex_ra3IPZ\templib.exp 
mex_find_epipolar_match.obj : error LNK2019: unresolved external symbol _dgemm referenced in function _ComputeResid 
mex_find_epipolar_match.mexw32 : fatal error LNK1120: 1 unresolved externals 
D:\PROGRA~1\MATLAB\R2010B\BIN\MEX.PL: Error: Link of 'mex_find_epipolar_match.mexw32' failed.
??? Error using ==> mex at 208 Unable to complete successfully.
(III)with out any given library file
>>mex mex_find_epipolar_match.c
   Creating library D:\Users\sudhakar\AppData\Local\Temp\mex__NhcC8\templib.x and object D:\Users\sudhakar\AppData\Local\Temp\mex__NhcC8\templib.exp 
mex_find_epipolar_match.obj : error LNK2019: unresolved external symbol _dgemm referenced in function _ComputeResid 
mex_find_epipolar_match.obj : error LNK2019: unresolved external symbol _dgesvd referenced in function _ComputeXLinear 
mex_find_epipolar_match.obj : error LNK2019: unresolved external symbol _dgesv referenced in function _ComputeXNonLinear 
mex_find_epipolar_match.mexw32 : fatal error LNK1120: 3 unresolved externals 
D:\PROGRA~1\MATLAB\R2010B\BIN\MEX.PL: Error: Link of 'mex_find_epipolar_match.mexw32' failed.
??? Error using ==> mex at 208 Unable to complete successfully.
Any one can help to fix this problem to run code

Best Answer

Versions of MATLAB through R2006b had the BLAS and LAPACK routines in one library, the libmwlapack.lib file. Versions of MATLAB R2007a and later split them into two separate libraries, libmwblas.lib and libmwlapack.lib. The routine you are missing from your link, dgemm, is a BLAS routine. You need to include the libmwblas.lib file in your mex command (in addition to keeping the libmwlapack.lib for the LAPACK routines you use).
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