## How to compute matrices in Einstein notation:

I would like to compute $$r_{ii’}=\sum_{kk’}A_{ii’}^{kk’}r_{kk’}$$ where all indices vary from 0 to 1 to yield a vector / matrix.

## How to install Linux for NRPy+, Einstein toolkit, Mathematica and Latex?

I need to use the following on my laptop:

• Einstein toolkit
• NRPy+
• Mathematica
• Latex

Which Linux version should I prefer? Which is the best way to uninstall my Windows 10 OS and turn to Linux?

## Einstein toolkit via Ubuntu Linux subsystem: how to install prerequisite packages?

Following Einstein toolkit’s Simplified tutorial for New Users I tried to “install Prerequisite packages” via the Ubuntu Linux subsystem by the command

sudo apt-get install build-essential pkg-config mpich2? python libmpich2?-dev gfortran git subversion curl gnuplot gnuplot-x11 

only to get the following list of errors

Reading package lists... Done Building dependency tree Reading state information... Done Package gnuplot is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source  Package subversion is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source  E: Unable to locate package mpich2? E: Couldn't find any package by glob 'mpich2?' E: Couldn't find any package by regex 'mpich2?' E: Unable to locate package libmpich2?-dev E: Couldn't find any package by glob 'libmpich2?-dev' E: Couldn't find any package by regex 'libmpich2?-dev' E: Package 'subversion' has no installation candidate E: Package 'gnuplot' has no installation candidate E: Unable to locate package gnuplot-x11 

I am really new to command prompt, Linux, Ubundu, etc. and have no idea how bad these errors are or how to fix them.

I do not know if the errors are due to some mistake during the installation of Ubuntu Linux subsystem.

I would appreciate any help.

P.S. My ultimate puprose is to use Einstein Toolkit on my Windows 10 PC so I would welcome any alternative to te tutorial’s tutorial’s approach.

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by: Lisa90
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Category: Graphics & Logos
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