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D.4.6.1 decompopts
Procedure from library decomp.lib (see decomp_lib).
- 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 :
Example:
| 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
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