5.1.160 univariate

Syntax:

univariate ( poly_expression )

Type:

int

Purpose:

returns 0 for not univariate, -1 for a constant or the number of the variable of the univariate polynomial.

Example:

ring r=0,(x,y,z),dp; univariate(x2+1); ==> 1 univariate(x2+y+1); ==> 0 univariate(1); ==> -1 univariate(var(2)); ==> 2 var(univariate(z)); ==> z