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D.5.5.13 cleanunit

Procedure from library resbinomial.lib (see resbinomial_lib).

Compute:
We clean (or forget) the units in a monomial, given by "y" variables

Return:
The list defining the monomial ideal already cleaned

Example:
 
LIB "resbinomial.lib";
ring r = 0,(x(1),y(2),x(3),y(4)),dp;
list flag=identifyvar();
ideal J=x(1)^3*y(2)*x(3)^5*y(4)^8;
list L=data(J,1,4);
L[2][1][1];  // list of exponents of the monomial J
==> [1]:
==>    3
==> [2]:
==>    1
==> [3]:
==>    5
==> [4]:
==>    8
list M=cleanunit(L[2][1][1],4,flag);
M;           // new list without units
==> [1]:
==>    3
==> [2]:
==>    0
==> [3]:
==>    5
==> [4]:
==>    0