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D.15.30.15 isZeroFraction
Procedure from library olga.lib (see olga_lib).
- Usage:
- isZeroFraction(frac), vector frac
- Purpose:
- determine if the vector frac represents zero
- Assume:
- frac is a valid fraction
- Return:
- int
- Note:
- returns 1, if frac == 0; 0 otherwise
Example:
| | LIB "olga.lib";
ring R = 0,(x,y,Dx,Dy),dp;
def S = Weyl();
setring S; S;
==> // coefficients: QQ
==> // number of vars : 4
==> // block 1 : ordering dp
==> // : names x y Dx Dy
==> // block 2 : ordering C
==> // noncommutative relations:
==> // Dxx=x*Dx+1
==> // Dyy=y*Dy+1
isZeroFraction([42,0,0,0]);
==> 1
isZeroFraction([0,0,Dx,3]);
==> 0
isZeroFraction([1,1,1,1]);
==> 0
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