#8004: region_plot does not handle lambda functions
---------------------------+------------------------------------------------
Reporter: jason | Owner: was
Type: defect | Status: positive_review
Priority: major | Milestone: sage-4.3.2
Component: graphics | Keywords:
Author: Jason Grout | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by rossk):
* status: needs_review => positive_review
Comment:
Despite a depreciation message, this worked as expected for all the cases
I tried.
{{{
sage: var('x y')
(x, y)
sage: region_plot(lambda x,y: x>y, (-4,4), (-4,4)) # works
sage: region_plot([lambda x,y: x>y, lambda x,y: x^2+y^2<10], (-4,4),
(-4,4)) # a list of lambdas also work
#
# Tried mixing the forms of the functions (one being a lamba and one an
expression)
# - got a depreciation message! (But still displayed the plot correctly)
#
sage: region_plot([lambda x,y: x>y, x^2+y^2<10], (-4,4), (-4,4))
/home/ross/sage-4.3.2.alpha0/local/lib/python2.6/site-
packages/sage/plot/contour_plot.py:569: DeprecationWarning: Unnamed ranges
for more than one variable is deprecated and will be removed from a future
release of Sage; you can used named ranges instead, like (x,0,2)
g, ranges = setup_for_eval_on_grid(f, [xrange, yrange], plot_points)
# ...but parentheses also produced the same plot correctly without the
message
sage: region_plot([(lambda x,y: x>y), (x^2+y^2<10)], (-4,4), (-4,4))
# tried the former example again - no depreciated message this time (!?)
# (Does sage only show depreciations once?)
sage: region_plot([lambda x,y: x>y, x^2+y^2<10], (-4,4), (-4,4))
# this worked too
sage: region_plot([lambda x,y: x>y, lambda x,y: x^2+y^2<10], (-4,4),
(-4,4), aspect_ratio=1)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8004#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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