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7.10.6.6 ncratSubstract

Procedure from library ncrat.lib (see ncrat_lib).

Usage:
ncrat h = ncratSubstract(f, g);
f, g both of type ncrat

Return:
h = f - g

Note:
operator '-' for ncrat is overloaded
with this procedure, hence
ncrat h = f - g;
yields the same result as
ncrat h = ncratSubstract(f, g);

Example:
 
LIB "ncrat.lib";
ncInit(list("x", "y", "z"));
ncrat f = ncratFromString("2*x*y");
print(f);
==> 2*x*y
ncrat g = ncratFromString("z");
print(g);
==> z
ncrat h1, h2;
h1 = ncratSubstract(f, g);
print(h1);
==> 2*x*y-z
h2 = f - g;
print(h2);
==> 2*x*y-z