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- Pardiso parameters : phase, pt maxfct and mnum. Matrix inverse

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xdominique

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04-09-2010
08:28 AM

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Pardiso parameters : phase, pt maxfct and mnum. Matrix inverse

I have a few questions (sorry if some of them look basic). First, is there a way to retrieve the result of the factorisation of phase 2 (the same result one would get from Lapack's posv)? I think there is something to do with parameters pt, maxfct and mnum, but I don't understand exactly how to use them. I suppose I would have to call Pardiso two times : one with phase = 12, and the second with phase = 33 (I want to mimick posv). Is this correct?

Second, is there a way to use Pardiso to find the inverse of a matrix (like finding A^-1 from Ax = b, if x and b are known)? I was hoping to use it instead of Lapack's potri.

Thanks and have a nice day!

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Todd_R_Intel

Employee

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04-09-2010
05:17 PM

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There are no special settings for this if that is what you mean. You could set b to the idenity, I. I'll let others comment on whether this is a good idea or not.

-Todd

xdominique

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04-14-2010
08:25 AM

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Hi,

Are there plans to release Lapack routines and drivers using sparse storage format? That would be really helpful as it will decrease significantly memory storage size. I'm thinking about computing matrix inverses, as they are computer intensive.

Thanks and have a nice day!

Gennady_F_Intel

Moderator

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04-14-2010
08:59 AM

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--Gennady

xdominique

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05-17-2010
08:35 AM

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And yes, Mr. Gennady, if I may made a request about it, I would really appreciate a Sparse Lapack. (:

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For more complete information about compiler optimizations, see our Optimization Notice.