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Re: MATRIX LOGARITHM (and EXPONENTIAL) [message #74697 is a reply to message #74696]

Thu, 27 January 2011 14:39

pgrigis
Messages: 436
Registered: September 2007

Senior Member

On Jan 27, 4:41 pm, teddyallen <teddyal...@yahoo.com> wrote:
> Just a quick question. Does IDL have a similar command to the popular
> MATLAB logm and expm so that I can take the matrix logarithm (and
> exponential)? I understand that ALOG and EXP will not function in this
> sense.
> Thank you,
> teddy

No, IDL doesn't have those functions built in.

I don't know if anyone has written routines to compute
either of those.

Do you need a solution for general arrays? In special cases
(say, if the determinant is small or the matrix can be
diagonalized) it may not be too hard to write a routine
for it. For more general cases it may be a bit more challenging.

Ciao,
Paolo

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[Message index]

		Re: MATRIX LOGARITHM (and EXPONENTIAL) By: James[2] on Thu, 27 January 2011 16:11
		Re: MATRIX LOGARITHM (and EXPONENTIAL) By: James[2] on Thu, 27 January 2011 16:10
		Re: MATRIX LOGARITHM (and EXPONENTIAL) By: pgrigis on Thu, 27 January 2011 14:40
		Re: MATRIX LOGARITHM (and EXPONENTIAL) By: pgrigis on Thu, 27 January 2011 14:39
		Re: MATRIX LOGARITHM (and EXPONENTIAL) By: penteado on Thu, 27 January 2011 14:37
		Re: MATRIX LOGARITHM (and EXPONENTIAL) By: zhaobw1993 on Wed, 21 October 2015 16:04
		Re: MATRIX LOGARITHM (and EXPONENTIAL) By: chris_torrence@NOSPAM on Fri, 23 October 2015 10:52

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