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Re: MATRIX LOGARITHM (and EXPONENTIAL) [message #74696 is a reply to message #74694]

Thu, 27 January 2011 14:40

pgrigis
Messages: 436
Registered: September 2007

Senior Member

On Jan 27, 5:37 pm, Paulo Penteado <pp.pente...@gmail.com> wrote:
> On Jan 27, 7:41 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.
>
> Can you explain what matrix log and exp are?

If A is a matrix, and # matrix multiplication

exp(A) = sum over k of A^k/k!

where A^2= A#A, A^3=A#A#A etc.

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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