#include <stdio.h>

#define MAXDIM_M    1000
#define MAXDIM_N    1000

double buffer[MAXDIM_M*MAXDIM_N];

void
initMatrix(long m, long n, double *A, long incRowA, long incColA)
{
    long i, j;

    for (j=0; j<n; ++j) {
        for (i=0; i<m; ++i) {
            A[i*incRowA+j*incColA] = j*n+i+1;
        }
    }
}

void
printMatrix(long m, long n, const double *A, long incRowA, long incColA)
{
    long i, j;

    for (i=0; i<m; ++i) {
        printf("   ");
        for (j=0; j<n; ++j) {
            printf("%4.1lf ", A[i*incRowA+j*incColA]);
        }
        printf("\n");
    }
    printf("\n");
}

int
main()
{
    long m = 7;
    long n = 8;

    //
    // Matrix mit Spaltenformat
    //
    long incRowA = 1;
    long incColA = 7;

    printf("\nInit A as ColMajor");
    printf("\n==================\n");
    initMatrix(m, n, buffer, incRowA, incColA);

    printf("A = \n");
    printMatrix(m, n, buffer, incRowA, incColA);

    printf("A^T = \n");
    printMatrix(n, m, buffer, incColA, incRowA);

    printf("A(2,:) = \n");
    printMatrix(1, n, &buffer[1*incRowA], incColA, incRowA);

    printf("buffer for A = \n");
    printMatrix(1, m*n, buffer, 1, 1);


    //
    // Matrix im Zeilenformat
    //

    incRowA = 8;
    incColA = 1;

    printf("\nInit A as RowMajor");
    printf("\n==================\n");
    initMatrix(m, n, buffer, incRowA, incColA);

    printf("A = \n");
    printMatrix(m, n, buffer, incRowA, incColA);

    printf("A^T = \n");
    printMatrix(n, m, buffer, incColA, incRowA);

    printf("A(2,:) = \n");
    printMatrix(1, n, &buffer[1*incRowA], incColA, incRowA);

    printf("buffer for A = \n");
    printMatrix(1, m*n, buffer, 1, 1);

    return 0;
}