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7.7.21.0. diffRat
Procedure from library dmodloc.lib (see dmodloc_lib).
- Usage:
- diffRat(v,j); v vector, j int
- Assume:
- Assume that v has exactly two components, second one not 0.
- Return:
- vector, representing rational function derivative of rational
function (v[1]/v[2]) w.r.t. var(j)
- Note:
- Possibly present non-commutative relations of the basering are
ignored.
Example:
| | LIB "dmodloc.lib";
ring r = 0,(x,y),dp;
vector v = [x,y];
diffRat(v,1);
==> y*gen(2)+gen(1)
diffRat(v,1) - [1,y];
==> 0
diffRat(v,2);
==> y2*gen(2)-x*gen(1)
diffRat(v,2) - [-x,y2];
==> 0
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