Jason K. Moore comments

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                                            Jason K. Moore

KanesMethod cannot distinguish if a Body is Particle or RigidBody

> Do you have any idea to resolve the ImportError? Importing inside the function is the typical solution.

KanesMethod cannot distinguish if a Body is Particle or RigidBody

You should import from exactly where the functions/classes are. from sympy.physics.mechanics.body import Body

KanesMethod cannot distinguish if a Body is Particle or RigidBody

Good noting that. We may not want to support Body in KanesMethod in that case. Or we need to make some examples that show how mixing the two ways of...

Physics Vector.magnitude() should return positive simplfied magnitudes

It is implementing the Euclidean 2-norm, so it should give a nonnegative real result. https://en.wikipedia.org/wiki/Norm_(mathematics)

Physics Vector.magnitude() should return positive simplfied magnitudes

This gives the correct answer: ```python In [14]: B.ang_vel_in(A).to_matrix(B).norm().simplify() Out[14]: Abs(Derivative(theta(t), t)) ```

Physics Vector.magnitude() should return positive simplfied magnitudes

Yes, that is the reason. But I think that we'd like this simplification to occur without having to set the assumptions to be real on variables. Physics.vector only works with...

Add undo (ctrl-Z) for cut/copy/paste/delete in the notebook

When I delete a cell with `ctrl-m-d` and then select `Undo delete cell` from the menu in IPython 1.1.1, the cell returns, but it is empty. That is, undo doesn't...

Password access to the Github API deprecated

I use the tokens for other services and it seems you just need to keep one around for the api, I think.

Travis is sunsetting .org

Any thoughts on having doctr work with CI other than travis? I use it for a number of projects, but it would be nice to jump ship from Travis at...

[Ch 4] misuse of term "learning goals"

Would it be better to actually write learning goals for each one? It would seem preferable to me. My hunch would be that the original authors intended to write goals/objectives...