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# 4 Installation

### Sections

1. Getting and Installing this Package
2. Loading and Testing the Package
3. Additional Requirements

## 4.1 Getting and Installing this Package

This package is available at

    http://www.icm.tu-bs.de/ag_algebra/software/distler/radiroot

in form of a gzipped tar-archive. For installation instructions see Chapter Installing a GAP Package in the GAP reference manual. Normally you will unpack the archive in the `pkg` directory of your GAP version by typing:

        bash> tar xfz radiroot.tar.gz        # for the gzipped tar-archive

## 4.2 Loading and Testing the Package

To use the Radiroot package you have to request it explicitly. This is done by calling

    gap> LoadPackage("radiroot");
    -----------------------------------------------------------------------------
    Loading  RadiRoot 2.4 (Roots of a Polynomial as Radicals)
    by Andreas Distler (a.distler@tu-bs.de).
    -----------------------------------------------------------------------------
    true

The `LoadPackage` command is described in Section LoadPackage in the GAP reference manual.

If you want to load the Radiroot package by default, you can put the `LoadPackage` command into your `.gaprc` file (see Section The .gaprc file in the GAP reference manual).

Once the package is loaded, it is possible to check the correct installation by running the test suite of the package with the command

        gap> ReadPackage( "radiroot", "tst/testall.g" );

## 4.3 Additional Requirements

To use Radiroot the package Alnuth 2.2.2 or higher has to be loaded with its full functionality available. This means in particular that KANT KANT in version 2.4 or 2.5 needs to be installed.

In the standard mode a dvi file is created to display the roots of a polynomial. As default the package uses the command `latex` searched for in your system programs to create the dvi file and the command `xdvi` to start the dvi viewer. If you can not use this settings you will have to change the function `RR_Display` in the file `Strings.gi` in the subdirectory `lib` of the package.

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