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multiplication by a diagonal matrix [message #40812]

Fri, 03 September 2004 03:53

lbusett
Messages: 9
Registered: March 2004

Junior Member

Hi all,

I have the following problem: given a matrix A(n,m) and a vector of
weighting factors w(n), i need to multiply each row of the matrix
A(i,*)by the corresponding weighting factor w(i).

I know that I can simply "transform" the w vector into a diagonal
matrix with diag_matrix and then multiply it with A (e.g.: result =
A##diag_matrix(w)), but for large values of n this solution is very
slow.

Can anybody suggest me a faster approach to solve this problem ?

Thanks in advance for the help,

Lorenzo Busetto

Remote Sensing Lab.
University of Milano-Bicocca.

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[Message index]

		multiplication by a diagonal matrix By: lbusett on Fri, 03 September 2004 03:53
		Re: multiplication by a diagonal matrix By: David Fanning on Wed, 08 September 2004 06:33

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