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Topic: Lapack spptrf function
Replies: 10   Last Post: Apr 12, 2013 11:08 AM

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Francesco Perrone

Posts: 39
Registered: 5/2/12
Re: Lapack spptrf function
Posted: Apr 10, 2013 1:42 PM
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Dear Mr. Lord,

yes I am aware of the function CHOL and I am already using it.

But CHOL gets tremendously slow when factorizing, e.g., a 1945*1945 matrix.

Within my code I call CHOL, within a 2048 iterations FOR loop, for three different matrices with the above mentioned size.

The elapsed time is about an hour.

For the same case, after downloading the LAPACK wrapper (, the elapsed time was around 17 min less than before: quite a bargain I'd urge.

Btw, after a bunch of tests, MATLAB started crashing at any time I tried calling the function: blatantly, I don't even have a clue why that happened.

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