## `patchlevel` -- the patch number of the installed MuPAD library

#### Introduction

`patchlevel``()` returns the patch number of the currently installed MuPAD library.

#### Call(s)

`patchlevel()`

#### Returns

a nonnegative integer.

#### Related Functions

`Pref::kernel`, `version`

#### Details

- `patchlevel` provides information about the patches installed in the local MuPAD setup. Patches (bug-fixes) to a release of the mathematical libraries are provided by Sciface Software or the MuPAD group. Whenever a new patch is installed, the patch level is increased by 1. The currently used library is determined by its version number (cf. the function `version`) together with its patch number.
- `patchlevel` is not related to the kernel version (`Pref::kernel`).
- Each new MuPAD version is initially released with patch number 0.
- To get information about new patches, please visit our web site at `www.mupad.de`.

#### Example 1

To query the version of the MuPAD library of your local installation, ask for its version number

    >> version()

                                     [2, 0, 0]

and for its patch number:

    >> patchlevel()

                                         0

If the returned patch number is greater than zero, a patch was installed.

#### Changes

- no changes

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