About SVD running time in Matlab and in C code which produced by Matlab coder.

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WillandSmith
WillandSmith 2015-8-13
评论： WillandSmith 2015-8-14
I use SVD like code below [U,S,V] = svd(PhiG,'econ'); which PhiG is double complex matrix with dimension 60*1024. In matlab code ,the SVD running time is about 0.04 second. However ,after I compile the matlab code to C code using matlab coder.The svd running time is about 4.0+s,which is about 100 times compared to the running time in Matlab code. I have noticed that the Matlab using lapack code to calculate SVD. So the difference in running time due to Fortran code beneath Matlab code? Or is there any other reason? And how can I improve the running time in C code? Thanks a lot for any feedback.

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Walter Roberson
Walter Roberson 2015-8-13
If you can use C++ then perhaps http://math.nist.gov/tnt/jama_doxygen/class_JAMA__SVD.html or something in http://lapackpp.sourceforge.net/
Your options are going to depend upon your target platform. For example if you are aiming at MS Windows then you may be able to call upon https://en.wikipedia.org/wiki/Math_Kernel_Library
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