| #### D.3.1.28 headStand Procedure from library `matrix.lib` (see matrix_lib). Usage: headStand(M); M matrix Return: matrix B such that B[i][j]=M[n-i+1,m-j+1], n=nrows(M), m=ncols(M) Example:
    LIB "matrix.lib";
    ring r=0,(A,B,C),dp;
    matrix M[2][3]=
    0,A,  B,
    A2, B2, C;
    print(M);
    ==> 0, A, B,
    ==> A2,B2,C
    print(headStand(M));
    ==> C,B2,A2,
    ==> B,A, 0

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