Singular Manual: ivmatSet

| #### D.8.8.5 ivmatSet Procedure from library `rootisolation.lib` (see rootisolation_lib). Usage: `ivmatSet(A, i, j, I)`; `A ivmat, i, j, int, I interval` Return: interval matrix `A` where `A[i][j] == I` Purpose: modify a single entry of an `ivmat` Example:
    LIB "rootisolation.lib";
    ring R = 0,x,dp;
    ivmat A = ivmatInit(2,2);             A;
    ==> [0, 0],[0, 0]
    ==> [0, 0],[0, 0]
    ==>
    A = ivmatSet(A, 1, 2, bounds(1, 2));  A;
    ==> [0, 0],[1, 2]
    ==> [0, 0],[0, 0]
    ==>

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