[petsc-users] PETSc turtorial example generating unexpected result

Maahi Talukder maahi.buet at gmail.com
Mon Jan 14 19:08:44 CST 2019


Hello all,

I complied and run the example *ex2f.F90* located in
*/home/maahi/petsc/src/ksp/ksp/examples/tutorials.
*As in the code the right hand side vector, b, was computed assuming an
exact solution of a vector with all elements of 1.0, all the values of
vector 'x' should have been 1.0. But after running the code as it was
provided, the values of vector x that I get are the followings -
 2.72322e-07
3.81437e-07
1.58922e-07
3.81437e-07
2.38878e-07
-6.65645e-07
1.58922e-07
-6.65645e-07
-2.51219e-07

I am wondering what went wrong? Could you please help me with some insight
into this?

Regards,
Maahi Talukder
Clarkson University
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