Evaluating the l2_norm of an MPI::Vector

[Wasim Niyaz Munshi ce21d400]

Hello everyone. I have a vector distributed over multiple processors. I want to compute the modulus of the entire vector and also the modulus of the portions of vector stored by each process. I would really appreciate some help in this regard.

Regards

Wasim

[Wolfgang Bangerth]

On 4/13/23 06:22, Wasim Niyaz Munshi ce21d400 wrote:
> **

Wasim:
For the former operation, vector.l2_norm() works. There are similar
functions for l1 and linfinity norms.

The latter operation is uncommon, and so there is no function. Why would
you want to compute the norm of only the elements stored on the current
process?

Best
W.



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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Wasim Niyaz Munshi ce21d400]

Thank You Prof. Bangerth. I actually needed the norm of the entire vector only. I was just curious if there existed a function that did it for each processor.

Regards

Wasim

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