| #### D.6.21.7 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

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