[petsc-users] Get a smaller vector with PETSc

[Rui Emanuel Ferreira da Silva]

I am writing to you to ask some technical problems that I am dealing
with the use of PETSc.

The problem that I am facing is the following: I have defined a vector  
in Petsc which was created with VecCreateMPI. After that, I read this  
vector from an external file with a PETSc viewer.

So if the initial vector is V with size N, I want to obtain a smaller  
vector U with size M, where M<N. I have an array of integers that are  
the indexes of V that I want to pass to U.

How can I do this?

Regards

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Rui Silva
EMTCCM (European Master in Theoretical Chemistry and Computational Modelling)
UAM, Departamento de Química, Módulo 13
CAMPUS http://www.uam.es/departamentos/ciencias/quimica/spline/index.html
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