D.4.6.1 decompopts

Usage:

decompopts(); or decompopts("reset");

Return:

nothing

Note:

in the first case, it shows the setting of the control parameters;
in the second case, it kills the user-defined control parameters and
resets to the default setting which will then be displayed.

int DECMETH; Method for computing the univariate decomposition
0 : (default) Kozen-Landau
1 : von zur Gathen

int IMPROVE Choice of coefficients for the decomposition
of a non-monic polynomials f.
0 : leadcoef( ) = leadcoef( ) and are monic
1 : (default), content( ) = 1

int MINS
of a non-monic polynomials f.
0 : g(0) = f(0), h(0) = 0 [ueberlegen fuer complete]
1 : (default), g(0)=0, h(0) = f(0)
2 : Tschirnhaus

int DECORD; The order in which the decomposition will be computed
0 : minfirst
1 : (default) maxfirst

int DEGONE; decompose also polynomials built on linear ones
0 : (default)
1 :

LIB "decomp.lib";
decompopts();
==> 
==>   === Global variables for decomp.lib === 
==> 
==>  -- DECMETH (int) not defined, implicitly 1
==>  -- MINS (int) not defined, implicitly 0
==>  -- IMPROVE (int) not defined, implicitly 1