This worked perfectly. Thanks again.
Thomas
On Jun 1, 3:05 pm, "Mike Hansen" <[EMAIL PROTECTED]> wrote:
> Hi Thomas,
>
> The issue comes from Pylab not knowing how to deal with instances of
> Sage's RealNumber class. When you do "4.0" from the command line, it
> gets changed into "RealNumber('4.0')". You can see this with the
> following commands:
>
> sage: preparse('4.0')
> "RealNumber('4.0')"
>
> In order to get Pylab to work as expected there are two easy solutions:
>
> 1) Run "RealNumber = float" to get Sage to return Python floats
> instead of RealNumbers. See below:
>
> sage: type(4.0)
> <type 'sage.rings.real_mpfr.RealNumber'>
> sage: RealNumber = float
> sage: type(4.0)
> <type 'float'>
>
> 2) Turn off the preparser when using Pylab:
>
> sage: preparser(False)
> sage: type(4.0)
> <type 'float'>
>
> Hope this helps.
>
> --Mike
>
> On Sun, Jun 1, 2008 at 12:57 PM, tkeller <[EMAIL PROTECTED]> wrote:
>
> > Hi folks,
> > Sorry to bombard the mailing list with questions, I'm starting to use
> > sage for more and more things lately. I'm trying to get a figure
> > together for a paper and thought I'd try using the bar() command in
> > pylab. However, the following code (modeled after an example in
> > matplotlib) gives an error. I thought maybe a problem with number
> > coercion was causing the issue, but explicitly casting the numbers as
> > floats has no effect. I should mention that I'm completely new to
> > matplotlib, so it could be that I'm just not supplying arguments
> > correctly.
>
> > import pylab as p
> > p.close()
> > pos=p.arange(4.0,dtype=float)
> > width=0.35
> > dat=p.array([-2.0,10.4,30.0,29.9],dtype=float)
> > p.bar(pos,dat,width,color='b')
> > p.savefig('sage.png')
>
> > This returns :
> > File "/home/thomas/.sage/sage_notebook/worksheets/admin/10/code/
> > 2.py", line 11, in <module>
> > p.bar(pos,dat,width,color='b')
> > File "/home/thomas/sage/local/lib/python2.5/site-packages/matplotlib/
> > pyplot.py", line 1402, in bar
> > ret = gca().bar(*args, **kwargs)
> > File "/home/thomas/sage/local/lib/python2.5/site-packages/matplotlib/
> > axes.py", line 3293, in bar
> > self.add_patch(r)
> > File "/home/thomas/sage/local/lib/python2.5/site-packages/matplotlib/
> > axes.py", line 1145, in add_patch
> > self._update_patch_limits(p)
> > File "/home/thomas/sage/local/lib/python2.5/site-packages/matplotlib/
> > axes.py", line 1153, in _update_patch_limits
> > self.update_datalim(xys)
> > File "/home/thomas/sage/local/lib/python2.5/site-packages/matplotlib/
> > axes.py", line 1180, in update_datalim
> > self.dataLim.update_numerix_xy(xys, -1)
> > TypeError: Bbox::update_numerix_xy expected numerix array
>
> > If anyone has some insight into this, I'd greatly appreciate it.
> > Thomas
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