Missing functions in sympy.physics.vector

Question

I want to derive properties like curl / divergence etc. from a vector/scalar field using a symbolic math library. According to the sympy documentation this is possible with the sympy.physics.vector module,

http://docs.sympy.org/dev/modules/physics/vector/api/fieldfunctions.html

http://docs.sympy.org/dev/modules/physics/vector/fields.html

However I can't find the curl/divergence functions anywhere in this module, according to the documentation there should be sympy.physics.vector.curl and sympy.physics.vector.divergence

I installed the version with pip and checked the version its 0.7.5. So any Ideas where I can find these functions? Maybe the documentation isn't up-to-date?

Answer 1

It's not that the docs aren't up-to-date, but that the docs you are looking at are too new. The versions you linked are the git development version of the docs, the sympy.physics.vector docs for version 0.7.5 are here:

http://docs.sympy.org/latest/modules/physics/vector/index.html

and you'll see they don't include the "Docstrings for basic field functions", as sympy.physics.vector.fieldfunctions is new since 0.7.5. If you wish to use these features, you could install the git development version, you can get instructions for that at http://docs.sympy.org/latest/install.html#git. Otherwise, you'll have to wait for the next SymPy version release.

Answer 2

The documentation is here, but I can't pretend that it looks particularly easy to follow. It looks as though the documentation is incomplete (and version 7.0 was different), so you may have to cast around for a while or ask the sympy people directly.

Answer 3

If you would describe what you wish to do I could show you how to do it using my new fork of sympy (https://github.com/brombo/sympy) using galgebra. I can be contacted at abrombo@verizon.net.