#11334: Update numpy to 1.6.1
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Reporter: jason | Owner: tbd
Type: task | Status: new
Priority: major | Milestone: sage-4.8
Component: packages | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by kcrisman):
{{{
sage: plot_slope_field(growth_rate*(1-y/capacity)*y, (x,0,5),
(y,0,capacity*2))
}}}}
> That function is independent of x, the next example after this depend on
both x and y. I am suspecting the messages we get in
This should be ok. The point is that the slope dy/dx is a function of y
only; this can be completely symbolically solved using separation of
variables to get the
[http://en.wikipedia.org/wiki/Logistic_function#In_ecology:_modeling_population_growth
logistic function].
> this particular case is quite justified and it is surprising we didn't
get any before. I am not sure what the correct formula should be.
If this is the division by zero stuff, it's the whole business with the
arrowheads having zero length. See #11208. I think Jason has a fix for
this, actually, but I don't recall the whole story of what happened once
it was reported to mpl.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11334#comment:24>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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