GAP (RadiRoot) - Chapter 3: The Info Class of the Package

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3 The Info Class of the Package
3.1 The Info Class of the Package
3.1-1 InfoRadiroot
3.1-2 SetInfoLevel

### 3 The Info Class of the Package

The `info` mechanism in GAP allows functions to print information during the computation (see Section Reference: Info Functions in the GAP reference manual for general information).

#### 3.1 The Info Class of the Package

##### 3.1-1 InfoRadiroot

`‣ InfoRadiroot` | ( info class )

is the info class of this package.

##### 3.1-2 SetInfoLevel

`‣ SetInfoLevel`( infoclass, level ) | ( operation )

sets the info level for `InfoRadiroot` to level, where level has to be an integer in the range 0-4.

The default value for `InfoRadiroot` is 1. Information why a function returns `fail` will be given with this setting.

    gap> InfoLevel(InfoRadiroot);
    1
    gap> RootsOfPolynomialAsRadicals(x^5-4*x+2);
    #I  Polynomial is not solvable.
    fail

Setting the info level to a higher value will cause messages to show up during single steps of the computation. On level 2 one gets a rough overview. Those who want to go into the details of the algorithm described in [Dis05] and of the implementation itself will find the information on level 3-4 helpful.

To use the package in silent mode the info level can be given the value 0.

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