On Monday 30 June 2008, William Stein wrote:
> On Mon, Jun 30, 2008 at 5:41 AM, Stan Schymanski <[EMAIL PROTECTED]> wrote:
> > I would like to be able to add legends to plots containing different
> > lines or functions. Could anyone give an example of how to achieve
> > this in SAGE?
> > For example, the following plot would be nice with a legend containing
> > the line colours and descriptions:
> >
> > sage: P1=plot(x^2,0,3)
> > sage: P1=plot(x^2,0,3,rgbcolor="red")
> > sage: P2=plot(x^3,0,3,rgbcolor="blue")
> > sage: show(P1+P2,axes_labels=['$x$', '$y$'])
> >
> > I read up a bit, but wasn't able to use any of the examples given for
> > Matplotlib directly in my SAGE notebook. Thanks already for your help!
>
> There is unfortunately no good way to add legens to Sage plots
> yet. When I desparatly need to do this, I use the text command
> and explicitly put text and a line on the plot, but of course that
> is not optimal.
>
> You can use the pylab/matplotlab plotting functionality which
> does allow for legends. The following illustrates using pylab,
> which comes with sage, but doesn't illustrate how to make
> legends (though pylab does support that).
This one does:
# data
x = srange(10)
d1 = [e^1.8 for e in x]
d2 = [e^1.7 + 1.2 for e in x]
import pylab
pylab.clf() # clear the figure first
pylab.figure(1)
# plot some data and add a legend
pylab.plot(x,d1, label="Foo")
pylab.plot(x,d2,label="Bar")
pylab.legend() # print the legend
pylab.title("$n^X$ FooBar")
pylab.ylabel("fubar") # label the axes
pylab.xlabel("0-9")
pylab.savefig('foo.png',dpi=72) # fire!
--
name: Martin Albrecht
_pgp: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8EF0DC99
_www: http://www.informatik.uni-bremen.de/~malb
_jab: [EMAIL PROTECTED]
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