Singular Manual: arrLastVar

| #### D.14.1.9 arrLastVar Procedure from library `arr.lib` (see arr_lib). Usage: arrLastVar(A); arr A Return: [int] number of the last variable A uses Note: useful if you want a list containing all variables x_1 ... x_k used in A, but you do not want to skip any like variables(A) does. Example:
    LIB "arr.lib";
    ring R = 0,x(1..10),dp;
    arr A = ideal(x(1), x(2), x(3), x(6));
    int n = arrLastVar(A);
    varMat(1..n);
    ==> _[1,1]=x(1)
    ==> _[2,1]=x(2)
    ==> _[3,1]=x(3)
    ==> _[4,1]=x(4)
    ==> _[5,1]=x(5)
    ==> _[6,1]=x(6)
    variables(A);
    ==> _[1]=x(1)
    ==> _[2]=x(2)
    ==> _[3]=x(3)
    ==> _[4]=x(6)
See also: arrLastVar; arrSwapVar; varMat; varNum.

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