| #### D.3.1.18 addrow Procedure from library `matrix.lib` (see matrix_lib). Usage: addrow(A,r1,p,r2); A matrix, p poly, r1, r2 positive integers Return: matrix, A being modified by adding p times row r1 to row r2 Example:
    LIB "matrix.lib";
    ring r=32003,(x,y,z),lp;
    matrix A[3][3]=1,2,3,4,5,6,7,8,9;
    print(A);
    ==> 1,2,3,
    ==> 4,5,6,
    ==> 7,8,9
    print(addrow(A,1,xy,3));
    ==> 1,   2,    3,
    ==> 4,   5,    6,
    ==> xy+7,2xy+8,3xy+9

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