记调试MKL MATLAB接口

在将MKL C++代码做MATLAB接口的过程中遇到一个小问题总是运行出错，今天终于解决，记录下来：

mxArray* aa = mxCreateSparse(num_of_feature, model->l, nonzero_element, mxREAL);
ptr = mxGetPr(aa);
jc = mxGetJc(aa);
ir = mxGetIr(aa);

代码在64位机子上mex后运行会出错，解决方法：

64-bit mex files using sparse matrices must be rebuilt with the "-largeArrayDims" option.  See the R2006b release

notes for more details.

> mex -largeArrayDims mkl-train.cpp