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D.2.3.17 primecoeffs
Procedure from library general.lib (see general_lib).
- Usage:
- primecoeffs(J[,p]); J any type which can be converted to a matrix
e.g. ideal, matrix, vector, module, int, intvec
p = integer
- Compute:
- primefactors <= p of coeffs of J (default p = 32003)
- Return:
- a list, say l, of two intvectors:
l[1] : the different primefactors of all coefficients of J
l[2] : the different remaining factors
Example:
| | LIB "general.lib";
primecoeffs(intvec(7*8*121,7*8));"";
==> [1]:
==> 2,7,11
==> [2]:
==> 1
==>
ring r = 0,(b,c,t),dp;
ideal I = -13b6c3t+4b5c4t,-10b4c2t-5b4ct2;
primecoeffs(I);
==> [1]:
==> 2,5,13
==> [2]:
==> _[1]=-1
==> _[2]=1
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