Call This Function from a C Program

In the C program:

/* open file for R instructions */
    sprintf(str,"%s/rfile.input", Dxmenu_Dir);
    if ( (fpR = creat(str, MODE)) == -1) {
      fprintf(stderr, "Cannot open file for R instructions.\n");
      return;
    }
 /* load the  file to be plotted */
    sprintf(datafilename, "%s_%d_%d_profile", name, slice,where);
/* Put this in the file opened above  and close the file*/
    sprintf(str, "rplot(\"%s\")\n", datafilename);  
    write(fpR,str,sizeof(char)*strlen(str));
    close(fpR);  
 /* run the R program */
   sprintf(str, "/bin/csh %s/rfile.sh %s", Path1, Path2);
   system(str);
  }

Transcript

So, in this case, I'm now writing in C.  I sprint() into a buffer a string - I form the file name, I create the file, I can load my data file in.  Again, I create the file name based upon the things that I've constructed with these parameters, "_profile". I read it in, and I write data, I close it.  I run my program and violà; I can use the system command to now invoke R, passing it the R function that I want to have executed on the data that I just read it.  And I dynamically can do that.