matplotlib-users Mailing List for matplotlib

>>>>> "Arnold" == Arnold Moene <arn...@wu...> writes:

    Arnold> unsupported operand type(s) for /: 'array' and 'float'

This is a known bug with older versions of Numeric (eg 22.0) combined
with "from __future__ import division".  It also affects current
versions of numarray.  If you upgrade to the latest Numeric it will go
away.  I try and code around it; in this case I forgot.  I'll add the
parens.

    Arnold> PS: the mathtext-option was a very pleasant surprise to me
    Arnold> (hadn't seen any discussion on it on the mailing list).

Glad to hear it - there was some discussion on the matplotlib-devel
list.  I'm sure you'll encounter strangeness and some parse errors
since it is not widely tested, so please alert me when you do (check
the KNOWN ISSUES section of
http://matplotlib.sourceforge.net/matplotlib.mathtext.html).

JDH

Hi all,

I encountered a strange error (which I now remember was there already in 
version 0.50). When I run (for example) the mathtext_demo.py, I get the 
following error:

<error>
File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_gtk.py", 
line 504, in points_to_pixels
     return points*PIXELS_PER_INCH/72.0*self.dpi.get()/72.0
TypeError: unsupported operand type(s) for /: 'array' and 'float'
</error>

When I replace that line 504 with (note the parentheses)
     return points*(PIXELS_PER_INCH/72.0*self.dpi.get()/72.0)
python is happy.

I don't understand why python doesn't like the present construct.
Possibly an odd combination of versions:

-> Python 2.3 (#2, Aug 31 2003, 17:27:29) [GCC 3.3.1 (Mandrake Linux 9.2 
3.3.1-1mdk)] on linux2
-> Numeric 22.0
-> scipy cvs_version = (1,196,1591,4120)

Cheers,

Arnold

PS: the mathtext-option was a very pleasant surprise to me (hadn't seen 
any discussion on it on the mailing list).

Well that was one juicy update!

I was just trying to figure out how to speed up the completer in
interactive.py (which adds a noticable lag to the prompt if len(locals())  
gets to 3000 like it does for me) when I noticed this new release.

TkAgg allows me to use the default python in interactive mode, which 
allows me to use rlcompleter, *and* have matplotlib plots pop up 
without losing the prompt. Which is all lovely.

A couple of issues I noticed with TkAgg:

* fontTools installed one of its files (FontTools.pth I think) without
read permission for normal users, which cause import fontTools to fail
mysteriously

* fontTools didn't find my TTF fonts because the extensions were TTF
instead of ttf

* if I savefig('file.eps') from the TkAgg backend, the EPS file is sized 
to something much bigger than A4 (but it still works fine from the GTK 
backend)

* after playing around, I found that 

text.fontname : sans

in .matplotlibrc is the only way to get reasonably nice sans serif both in 
TkAgg and in eps files. Otherwise I get complaints from one or the other 
(e.g. if I specify Arial or Helvetica).

Cheers and thanks,
Matthew.

First of all, thanks very much for matplotlib!  This is a great library, and
fills one of the last voids in regards to scientific python computing.

On to the question, has anyone written a boxplot function yet?  If so,
please share the code.  If not, I'll take a stab at it.

Best Regards,
Mike

Hello John,

   I have run into the following minor matplotlib bug.  Using the sample 
code below, the y axis label and tick marks in the second subplot seem 
not to be in the right places.  Also on that second subplot, the first 
legend is missing when the window is initially drawn, but gets redrawn 
correctly if I use the x axis interactive scrolling buttons.

   Attached to this note is a snapshot of the figure window as initially 
drawn showing the bugs.  (I don't know whether the mailing list deals 
with attachments correctly, so I'm mailing you a copy directly.)

   The installation here is matplotlib version 0.50 running on a Redhat 
9 linux box:

[pje@amon site-packages]$ uname -a
Linux amon 2.4.20-6smp #1 SMP Thu Feb 27 09:59:40 EST 2003 i686 i686 
i386 GNU/Linux

-----------------------------------------------------------------------

Code:

from matplotlib.matlab import *

figure(1)
subplot(211)
plot(rand(50),'r')
plot(rand(30),'k')
plot(rand(80),'g')
plot(rand(70),'b')
plot(rand(60),'m')

plot(5 * array([1,1]), get(gca(),'ylim'), 'b')
plot(15 * array([1,1]), get(gca(),'ylim'), 'b')

axis([0,100,-2,2])
ylabel('Test me')
title('Test me')
legend(['TX Min', 'RX min', 'Pulse 1', 'Pulse 2', 'P1-P2'])

subplot(212)
plot(rand(50),'r')
plot(rand(30),'k')
plot(rand(80),'g')
plot(rand(70),'b')
plot(rand(60),'m')

plot(5 * array([1,1]), get(gca(),'ylim'), 'b')
plot(15 * array([1,1]), get(gca(),'ylim'), 'b')

axis([0,100,-2,2])
ylabel('Test me')
title('Test me')
legend(['TX Min', 'RX min', 'Pulse 1', 'Pulse 2', 'P1-P2'])

show()

--
----
Phil Erickson                   email:  pj...@ha...
Atmospheric Sciences Group      WWW:    http://www.haystack.mit.edu
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