#2922: scale function for plot_vector_field
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Reporter: schilly | Owner: was
Type: enhancement | Status: new
Priority: minor | Milestone: sage-4.1.2
Component: graphics | Keywords:
Reviewer: | Author:
Merged: |
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Comment(by jason):
So basically you want to give a function that gives the length of a
vector? That sounds reasonable.
Since Sage is actually the thing that generates the vectors, and
matplotlib just plots them, I think scaling the vectors in Sage to each
have the length you want is the correct thing to do here, before passing
them to matplotlib.
plot_vector_field((-y,-x), (x,0,1),(y,0,1), norm=f)
where f is a function defined to take f(v,w), where v is the vector, w is
the point in space (as a vector).
so your examples would be:
f=lambda v,w: min(1,v.norm())
f=lambda v,w: log(1+v.norm())
We could then adjust the scale parameter of the quiver plot so that the
arrows would plot exactly the length you wanted (I believe units='x',
scale=1 should do the job).
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2922#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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