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D.6.21.6 qhmatrix
Procedure from library spcurve.lib (see spcurve_lib).
- Usage:
- qhmatrix(M); M a k x (k+1) matrix
- Return:
- list, consisting of an integer vector containing the weights of
the variables of the basering and an integer matrix giving the
weights of the entries of M, if M is quasihomogeneous;
zero integer vector and zero integer matrix, if M is not
quasihomogeneous, i.e. does not allow row and column weights
Example:
| | LIB "spcurve.lib";
ring r=0,(x,y,z),ds;
matrix M[3][2]=z,0,y,x,x^3,y;
qhmatrix(M);
==> [1]:
==> 1,2,1
==> [2]:
==> 1,0,
==> 2,1,
==> 3,2
pmat(M);
==> z, 0,
==> y, x,
==> x3, y
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