using dgetrf on a matrix of size m xn when n >m

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Adrianna 2011-6-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/10050-using-dgetrf-on-a-matrix-of-size-m-xn-when-n-m

I would like to use the lapack LU factorization with pivoting ie. dgetrf. I need the pivoting to be wrt to the rows of a matrix A that is size m x n where m<n.

If I could call lapack directly from matlab this would work. However when I try to call the command from matlab. Matlab crashes.

I have a stupid fix which is to fill the expand the matrix A to a square matrix Atil which has A as the upper block and zeros below. This works but sets off a warning inside of dgetrf and it prints this warning each time. Is either possible to turn off the warning or is there are smarter fix for this problem?

Thanks in advance for your help.