why is this function to write a matrix on a file not working? It's in C

This is a discussion on why is this function to write a matrix on a file not working? It's in C within the C Programming forums, part of the General Programming Boards category; Hallo everyone! this is my first post so if I make any mistakes plase let me know.. I am writing ...

  1. #1
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    Sep 2009
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    why is this function to write a matrix on a file not working? It's in C

    Hallo everyone! this is my first post so if I make any mistakes plase let me know..
    I am writing this program in which I generate a hilbert matrix and create it's inverse. then I manipulate these 2 matrices and obtain other ones, that I shall call M,M1, M2, etc.. at a certain point I want to save one of these matrices, say M, on a file and to do so, I have to write and independet function that is called from the main.. this is what I wrote but it's not working!! can anyone help?!

    /* function to save matrix on file */

    Code:
    void savematrix(double n, double matrix[][MaxDim])
    {
         
         int i,j;
         FIlE *f1;
         f1=fopen("matrix.txt","w");
         if (f1=NULL)
         {
                printf("file could not be opened");
                     exit(-1);
                     }
         
         for (i=0;i<n;i++)
         {
             for (j=0;j<n;j++)
             {
                 fprintf(f1,"%5.2f ", matrix[i][j]);
                 }
                 fprintf(f1,"\n");
    }
    fclose(f1);
    }

  2. #2
    Registered User
    Join Date
    Sep 2009
    Posts
    2
    ok.. I found the error:
    it shold have been:

    if (f1==NULL)

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