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Re: failed matrix inversion returns input-- interesting [message #49309 is a reply to message #49307]

Fri, 14 July 2006 00:09

marc schellens[1]
Messages: 183
Registered: January 2000

Senior Member

Ed Hyer wrote:
> Can someone explain this behavior?
> IDL> testm=[[0,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]]
> IDL> testmi=invert(testm,status)
> IDL> print,status; 0=success, 1=fail, 2=pivot used
> 1
> IDL> print,testmi
> 0.00000 0.00000 0.00000 0.00000
> 0.00000 1.00000 0.00000 0.00000
> 0.00000 0.00000 1.00000 0.00000
> 0.00000 0.00000 0.00000 1.00000
>
> Is there any reason in creation why IDL simply copies the input into
> the output if it cannot do the inversion? That seems, well, malevolent,
> unless I'm missing something.

Well, what do you suggest is better?

Marc

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[Message index]

		Re: failed matrix inversion returns input-- interesting By: news.verizon.net on Fri, 14 July 2006 05:23
		Re: failed matrix inversion returns input-- interesting By: mmeron on Fri, 14 July 2006 00:30
		Re: failed matrix inversion returns input-- interesting By: Bringfried Stecklum on Fri, 14 July 2006 00:14
		Re: failed matrix inversion returns input-- interesting By: marc schellens[1] on Fri, 14 July 2006 00:09

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