I understand this might be a slightly subjective question, but I am honestly curious what programming languages are used by the mathematics community.

I would imagine that there is a group of mathematicians out there that use haskell because it might be more consistent with ideas from mathematics. Is this true? 

What about APL? Do mathematicians today use APL or is that just a relic of the past?

Bryan Birch is credited with once saying that he programmed in a very high-level programming language called "graduate student".