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- What LAPACK function is available to calculate 2-norm of a matrix?

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zzzhhh

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11-04-2018
02:13 PM

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What LAPACK function is available to calculate 2-norm of a matrix?

What LAPACK function is available to calculate 2-norm (or spectral norm) of a matrix? Thank you.

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Nadezhda_M_Intel

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11-07-2018
08:00 AM

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Unfortunately in LAPACK we don't have function for 2-norm.

Computations of spectral norm is very time-consuming task. Using "F" norm from ?lange function you can get fast upper estimation.

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Gennady_F_Intel

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11-04-2018
07:17 PM

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look at ?nrm2 routines, where ? == [s,d,c,z]

zzzhhh

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11-04-2018
07:21 PM

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That's BLAS level 1 routine, for vector norm only. But I was asking about matrix norm in LAPACK.

Nadezhda_M_Intel

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11-07-2018
07:40 AM

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Nadezhda_M_Intel

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11-07-2018
08:00 AM

313 Views

Unfortunately in LAPACK we don't have function for 2-norm.

Computations of spectral norm is very time-consuming task. Using "F" norm from ?lange function you can get fast upper estimation.

zzzhhh

Beginner

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11-07-2018
09:14 AM

312 Views

Thanks, Nadezhda Mozartova. I have to use 2-norm. This is not something I have control over.

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