[petsc-users] read variables from a source file in petsc

[Sepideh Kavousi]

thanks. It works

Sepideh

________________________________
From: Matthew Knepley <knepley at gmail.com>
Sent: Tuesday, April 3, 2018 5:53:56 AM
To: Sepideh Kavousi
Cc: petsc-users at mcs.anl.gov
Subject: Re: [petsc-users] read variables from a source file in petsc

On Mon, Apr 2, 2018 at 10:52 PM, Sepideh Kavousi <skavou1 at lsu.edu<mailto:skavou1 at lsu.edu>> wrote:

Hi all,

I wrote a petsc code, and I defined my variables in a separate file, namely common.h, and common.c as following


common.h:

extern int i;
extern int n;
Notice that these declarations are inconsistent for the main file.


common.c:


#include <petsc.h>
#include "common.h
PetscScalar i;      // Define i and initialize
PetscScalar n;      // Define n and initialize
i=2.2;
n=3.5;
Now in my prog.c  code I have:

#include <petsc.h>
#include <common.h>
static char help[]="program main";
int main (int argc, char **argv){
PetscInitialize(&argc,&argv, (char*) 0,help);
PetscPrintf(PETSC_COMM_WORLD,"i=%f!\n",a);
PetscPrintf(PETSC_COMM_WORLD,"n=%f!\n",b) ;
PetscFinalize();
}

if my it was not using petsc and it was a normal c code, I could run it using the following command:
          gcc prog. c common.c
but now that I am using petsc, I do not know how should I include common.c in my makefile.
my makefile looks like this:

include ${PETSC_DIR}/lib/petsc/conf/variables
include ${PETSC_DIR}/lib/petsc/conf/rules
prog: prog.o  chkopts
-${CLINKER} -o prog.out prog.o ${PETSC_LIB}
${RM} *.o
You want

prog: prog.o common.o chkopts
      -${CLINKER} -o prog.out prog.o common.o ${PETSC_LIB}

   Matt
.PHONY: distclean rune_1 test
distclean:
@rm -f *~ prog
Thanks,
Sepideh








--
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/<http://www.caam.rice.edu/~mk51/>
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