[petsc-users] PetscOptionsGetRealArray command line format

Xiangdong epscodes at gmail.com
Fri Feb 14 16:21:56 CST 2014

I have a simple script (see below) by just
calling PetscOptionsGetRealArray. I run the program like this: mpirun -np
1 runarraytest -myarray 1,2,3,4,5. However, the output is always "the
length of input myarray is 0".

Can you produce the correct result? Thank you.

Below is the script I use:

#include <petsc.h>

int main(int argc, char **argv)
  PetscInitialize(&argc, &argv, PETSC_NULL, PETSC_NULL);

  double myarray[10];
  int nmax;
  PetscBool flg;


  printf("the length of input myarray is %d \n",nmax);

  int i;
      printf(" %g\n",myarray[i]);

  return 0;

On Fri, Feb 14, 2014 at 3:47 PM, Jed Brown <jed at jedbrown.org> wrote:

> Xiangdong <epscodes at gmail.com> writes:
> > Now I see some random behavior. After compiling the code, for the same
> > command line input, the output sometimes are correct (print values
> > 1,2,3,4,5 with nmax=5), but sometime output all zeros (nmax is zero). I
> did
> > not change anything, but just running same input many times.
> >
> > Any hints for this random behavior? Thank you.
> Run with valgrind.  It is probably some other memory corruption
> interfering.
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