Singular Manual: arrChambers

| #### D.14.1.42 arrChambers Procedure from library `arr.lib` (see arr_lib). Usage: arrChambers(A); arr A Return: [int] The number of chambers of an arrangement, which is equal to the evaluation of the Poincare polynomial at 1. Example:
    LIB "arr.lib";
    ring R = 0,(x,y),dp;
    arr A = ideal(x,y,x+y-1);
    arrChambers(A);
    ==> 7
See also: arrBoundedChambers; arrChambers; arrPoincare.

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