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D.6.16.7 relweight

Procedure from library spcurve.lib (see spcurve_lib).

Usage:
relweight(N,W,a); N matrix, W intmat, a intvec

Assume:
N is a non-zero matrix
W is an integer matrix of the same size as N
a is an integer vector giving the weights of the variables

Return:
integer, max(a-weighted order(N_ij) - W_ij | all entries ij)
string "ERROR" if sizes do not match

Example:
 
LIB "spcurve.lib";
ring r=32003,(x,y,z),ds;
matrix N[2][3]=z,0,y,x,x^3,y;
intmat W[2][3]=1,1,1,1,1,1;
intvec a=1,1,1;
relweight(N,W,a);
==> 2