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D.7.1.25 power_products
Procedure from library finvar.lib (see finvar_lib).
- Usage:
- power_products(dv,d);
dv: an <intvec> giving the degrees of homogeneous polynomials, d: the
degree of the desired power products
- Return:
- a size(dv)*m <intmat> where each column ought to be interpreted as
containing the exponents of the corresponding polynomials. The product
of the powers is then homogeneous of degree d.
Example:
| | LIB "finvar.lib";
intvec dv=5,5,5,10,10;
print(power_products(dv,10));
==> 2 1 1 0 0 0 0 0
==> 0 1 0 2 1 0 0 0
==> 0 0 1 0 1 2 0 0
==> 0 0 0 0 0 0 1 0
==> 0 0 0 0 0 0 0 1
print(power_products(dv,7));
==> 0
==> 0
==> 0
==> 0
==> 0
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