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

[Matthew Knepley]

On Mon, Apr 2, 2018 at 10:52 PM, Sepideh Kavousi <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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