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Re: Infinity matrix determinant [message #89695 is a reply to message #89693]

Mon, 17 November 2014 03:27

Sergey Anfinogentov is currently offline

Sergey Anfinogentov
Messages: 11
Registered: September 2012

Junior Member

You can still calculate inverse matrix.

because for inverse matrix you have

(kA)^-1 = 1/k*(A^-1)
and
A^-1 = k*(kA^-1)

Try the following IDL code:

factor = 1d12
matrrix = matrix/factor
inverse = invert(matrix) ; invert is a built in function of IDL
inverse = inverse/factor

This should work fine.
For the determinant of such a matrix double precision is not enough. You should probably just memorize that you have a multiplier 1e24000.

> Dear Sergey,
>
> Thank you for answer.
> The point is here that the factor^2000d return Infinity
>
> IDL> print,(1.0d12)^2000d
> Infinity

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[Message index]

		Infinity matrix determinant By: amin farhang on Mon, 17 November 2014 00:23
		Re: Infinity matrix determinant By: Sergey Anfinogentov on Mon, 17 November 2014 01:57
		Re: Infinity matrix determinant By: amin farhang on Mon, 17 November 2014 02:10
		Re: Infinity matrix determinant By: Sergey Anfinogentov on Mon, 17 November 2014 03:24
		Re: Infinity matrix determinant By: Sergey Anfinogentov on Mon, 17 November 2014 03:27

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