added matlab instructions

docs/matlab.md

@@ -0,0 +1,55 @@
+# matlab
+
+## Installation via AUR
+
+### PKGBUILD
+Download PKGBUILD: `paru -G matlab`
+
+### Licenses
+- Go to [License center](https://www.mathworks.com/licensecenter) on mathworks
+- On install and activate tab; select (or create) an appropriate license
+- Navigate to download the license file and the file installation key
+- Download the **license file** and put the file in the repository
+- Copy and paste the **file installation key** in a plain text file
+
+## create Tarball
+
+Check, that `libselinux` and `libxcrypt-compat` are installed. Otherwise the installer will exit with error code 42 and no further instructions.
+```sh
+paru -S --asdeps libselinux libxcrypt-compat
+```
+
+Then:
+-  [Download the matlab installer](https://www.mathworks.com/downloads)
+-  Unpack and launch the installer
+-  After logging in and accepting license; select `Advanced Options > I want to download without installing` from the top dropdown menu.
+-  Set the download location to an empty directory called `matlab`
+-  Select the toolboxes you want.
+
+After downloading; from the parent directory; do
+```sh
+tar cf matlab.tar matlab
+```
+to create the tarball. The folder here called `matlab` usually is given the download-time as it's name. Rename to `matlab` before compressing.
+
+Move the matlab.tar to the repository.
+Adjust the `pkgver` and `release` vars in the `PKGBUILD` to reflect current release.
+Run `makepkg -si` to install.
+
+## Configuration
+### fix graphics driver with intel
+
+In the case of `libGL error: failed to open iris:`:
+
+Add to the `matlab` script (`sudo nvim $(which matlab)`) at the top:
+```sh
+export MESA_LOADER_DRIVER_OVERRIDE=i965
+```
+
+### HiDPI Fix
+In Matlab:
+```m
+s = settings;s.matlab.desktop.DisplayScaleFactor
+s.matlab.desktop.DisplayScaleFactor.PersonalValue = 2
+```
+This value can be a float.

index.md

@@ -15,6 +15,7 @@ Happy to accept pull requests for new topics!
 - [rainloop](docs/rainloop.md) webbased email client
 - [server](docs/ServerSetup.md) short guide for hosting a server
 - [php](docs/php.md) short guide for getting php up and running with nginx
+- [matlab](docs/matlab.md) A proprietary but extensive python alternative with integrated IDE.
 
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