Program that writes tensor equations out

[JonnyMaddox]

Hi, I'm looking for a program that spits out fully summed index equations. For example $T_{ii}$ in, out comes $T_{11}+T_{22}+...$ and so on, with Einstein summation convention.

 

[jedishrfu]

Some programming languages have features to iterate over arrays. MATLAB is one example.

However I've not seen any that will do the expansion.

Why do you need this?

 

[fluidistic]

I think Maxima can do the job (see http://maxima.sourceforge.net/docs/manual/maxima_25.html) though I am not familiar with this.

 

[JonnyMaddox]

I think Maxima can do the job (see http://maxima.sourceforge.net/docs/manual/maxima_25.html) though I am not familiar with this.

Hi thanks, I'll look that up. I use maxima anyway.