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C libraries-LAPACK MEPL EIGEN

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ANAGHA GOURI
ANAGHA GOURI 2017-12-25
评论： Walter Roberson 2018-1-16
I am finding it difficult to learn about C libraries-LAPACK MEPL EIGEN. Please help me find good references.
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ANAGHA GOURI
ANAGHA GOURI 2018-1-16
In daxpy(),isn't parameter DA specify the scalar alpha. But 1/max(B) is a vector. So how will it calculate alpha*x+y with 1/max(B) as the "alpha" parameter, B(:) as the x parameter, and the vector of zeros as the "y" parameter?
Walter Roberson
Walter Roberson 2018-1-16
I did not notice at the time of the original post that you were not asking for the maximum over the entire matrix. I later updated with "there are no LAPACK or BLAS calls for scalar multiplication or division on a per-column basis."

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Jan
Jan 2017-12-29
Is there a LAPACK or CBLAS function that can be used to normalise
an m by n matrix ?
A=abs(B/max(B)); %B is m by n matrix
No, there is no LABACK or CBLAS function for this. Do you mean
A = abs(B / max(B(:))) % The (:) is essential
% Or
A = abs(B ./ max(B)) % The ./ is essential
Is there a LAPACK or CBLAS function that can be used to
find log10 of an m by n matrix?
A = 10*log10(B);
No, there is no LAPACK or BLAS function for this. The shown code is efficient already.
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ANAGHA GOURI
ANAGHA GOURI 2018-1-10
I used dgemm() for matrix matrix multiplication. Is there a LAPACK or CBLAS function to perform element by element multiplication??
Walter Roberson
Walter Roberson 2018-1-10
I do not see any routines for element by element multiplication. http://www.icl.utk.edu/~mgates3/docs/lapack.html

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