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Re: inverse gradient [message #64034 is a reply to message #63980]

Tue, 02 December 2008 06:45

pgrigis
Messages: 436
Registered: September 2007

Senior Member

erano wrote:
>>
>> Oddly enough, that's the second time sparse arrays have come up in one
>> week!
>>
>> You want LINBCG, which takes as input asparsematrix created using
>> SPRSIN. The help pages on them are pretty decent - give them a read.
>>
>> -Jeremy.
>
> YES, we are at the right direction.
> BUT my matrix iz M*N (where M=2*N). when I add zeros to make it M*M,
> and thrn use the SPRSIN to make it sparse, the solution from LINBCG is
> noot good.

How much is M and N?

Paolo

> When I work with very small array, using the LA_LEAST_SQUARES on the
> original array give clean and good result.

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[Message index]

		inverse gradient By: erano on Wed, 26 November 2008 02:10
		Re: inverse gradient By: pgrigis on Tue, 02 December 2008 10:59
		Re: inverse gradient By: erano on Tue, 02 December 2008 11:42
		Re: inverse gradient By: erano on Tue, 02 December 2008 10:50
		Re: inverse gradient By: pgrigis on Tue, 02 December 2008 09:20
		Re: inverse gradient By: erano on Tue, 02 December 2008 09:04
		Re: inverse gradient By: pgrigis on Tue, 02 December 2008 07:45
		Re: inverse gradient By: erano on Tue, 02 December 2008 07:12
		Re: inverse gradient By: pgrigis on Tue, 02 December 2008 06:45
		Re: inverse gradient By: erano on Tue, 02 December 2008 01:27
		Re: inverse gradient By: pgrigis on Fri, 28 November 2008 08:31
		Re: inverse gradient By: pgrigis on Fri, 28 November 2008 08:18
		Re: inverse gradient By: pgrigis on Fri, 28 November 2008 08:14
		Re: inverse gradient By: pgrigis on Fri, 28 November 2008 08:10
		Re: inverse gradient By: Jeremy Bailin on Fri, 28 November 2008 05:27
		Re: inverse gradient By: erano on Fri, 28 November 2008 01:31
		Re: inverse gradient By: Jeremy Bailin on Thu, 27 November 2008 06:24
		Re: inverse gradient By: pgrigis on Tue, 02 December 2008 14:44
		Re: inverse gradient By: erano on Tue, 09 December 2008 00:36
		Re: inverse gradient By: erano on Wed, 24 December 2008 01:55

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