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Re: MATRIX LOGARITHM (and EXPONENTIAL) [message #92161 is a reply to message #74693]

Wed, 21 October 2015 16:04

zhaobw1993
Messages: 1
Registered: October 2015

Junior Member

On Thursday, January 27, 2011 at 5:11:53 PM UTC-7, James wrote:
> On Jan 27, 4:10 pm, James <donje...@gmail.com> wrote:
>>
>> If the matrix A is diagonalizable, then:
>>
>> eigenvals = LA_EIGENPROBLEM(A, EIGENVECTORS=evecs)
>> expA = evecs # diag_matrix(exp(eigenvals)) # invert(evecs)
>> logA = evecs # diag_matrix(alog(eigenvals)) # invert(evecs)
>
> sorry, replace INVERT with LA_INVERT to account for complex
> eigenvectors.

Does logA need to be transposed?
My way was,
evens = transpose(evens)
logA = evecs ## diag_matrix(eigenvalues) ## invert(evecs)
result of this way seems to be transpose of result of your way.

Thanks

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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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