WriteTecplot2D.c File Reference

Write a vector field and its grid to a 2D Tecplot file. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <basic.h>
#include <arrayfunctions.h>

Go to the source code of this file.

Functions
int	WriteTecplot2D (int ndims, int nvars, int *dim, double *x, double *u, char *f, int *index)

Detailed Description

Write a vector field and its grid to a 2D Tecplot file.

Author

Debojyoti Ghosh

Definition in file WriteTecplot2D.c.

Function Documentation

int WriteTecplot2D	(	int	ndims,
		int	nvars,
		int *	dim,
		double *	x,
		double *	u,
		char *	f,
		int *	index
	)

Write a vector field and its associated grid to a 2D Tecplot file. This file can then be visualized using Tecplot (http://www.tecplot.org) (if available).

Note: It's essentially a text file, and apart from the first two lines with Tecplot specific headers, the data is written out in the same format as WriteText().

Parameters

ndims	Number of spatial dimensions
nvars	Number of variables at each grid point
dim	Integer array with the number of grid points in each spatial dimension as its entries
x	Array of spatial coordinates representing a Cartesian grid (no ghost points)
u	Array containing the vector field to write (no ghost points)
f	Filename
index	Preallocated integer array of size ndims

Definition at line 19 of file WriteTecplot2D.c.

{
  if (ndims !=2) {
    fprintf(stderr,"Error in WriteTecplot2D(): This functions is hardcoded for 2-dimensional ");
    fprintf(stderr,"problems only. Instead, ndims=%d.\n",ndims);
    return(1);
  }
  int i;
  int imax = dim[0];
  int jmax = dim[1];

  FILE *out;
  out = fopen(f,"w");
  if (!out) {
    fprintf(stderr,"Error: could not open %s for writing.\n",f);
    return(1);
  }

  /* writing tecplot data file headers */
  fprintf(out,"VARIABLES=\"I\",\"J\",\"X\",\"Y\",");
  char varname[3] = "00";
  for (i = 0; i < nvars; i++) {
    fprintf(out,"\"%s\",",varname);
    if (varname[1] == '9') { varname[0]++; varname[1] = '0'; }
    else                     varname[1]++;
  }
  fprintf(out,"\n");
  fprintf(out,"ZONE I=%d,J=%d,F=POINT\n",imax,jmax);

  /* writing the data */
  int done = 0; _ArraySetValue_(index,ndims,0);
  while (!done) {
    int i, p;
    _ArrayIndex1D_(ndims,dim,index,0,p);
    for (i=0; i<ndims; i++) fprintf(out,"%4d ",index[i]);
    for (i=0; i<ndims; i++) {
      int j,offset = 0; for (j=0; j<i; j++) offset += dim[j];
      fprintf(out,"%+1.16E ",x[offset+index[i]]);
    }
    for (i=0; i<nvars; i++) fprintf(out,"%+1.16E ",u[nvars*p+i]);
    fprintf(out,"\n");
    _ArrayIncrementIndex_(ndims,dim,index,done);
  }
  fclose(out);
  return(0);
}