matplotlib-users

[Matplotlib-users] bug somewhere called by draw_lines

[Andrew S. <str...@as...>]

when running the following simple script:

from matplotlib.matlab import *
from numarray import *

theta = arange(0.0,8*pi,0.1)
a=1
b=.2

dt = 0.0
x = a*cos( theta )*exp(b*theta)
y = a*sin( theta )*exp(b*theta)

plot(x,y)
show()
#savefig('ss')

with the following combination of software:

matplotlib 0.54
numarray 0.9
python 2.2.1
windows XP

if I use WXAgg or Agg, I get this:

Traceback (most recent call last):
  File "simple_spiral.py", line 13, in ?
    show()
  File 
"C:\Python22\Lib\site-packages\matplotlib\backends\backend_wx.py", line 
1124, in show
    figwin.canvas.draw()
  File 
"C:\Python22\Lib\site-packages\matplotlib\backends\backend_wxagg.py", 
line 50, in draw
    agg.draw()
  File 
"C:\Python22\Lib\site-packages\matplotlib\backends\backend_agg.py", line 
299, in draw
    self.figure.draw(self.renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\figure.py", line 128, 
in draw
    for a in self.axes: a.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\axes.py", line 603, in draw
    self.xaxis.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\axis.py", line 463, in draw
    tick.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\axis.py", line 125, in draw
    if midPoint and self.tick1On: self.tick1line.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\lines.py", line 193, in 
draw
    self._lineFunc(renderer, gc, xt, yt)
  File "C:\Python22\Lib\site-packages\matplotlib\lines.py", line 326, in 
_draw_solid
    renderer.draw_lines(gc, xt,yt)
TypeError: can't convert complex to float; use e.g. abs(z)

if I use PS, I get this:

Traceback (most recent call last):
  File "simple_spiral.py", line 14, in ?
    savefig('ss')
  File "C:\Python22\Lib\site-packages\matplotlib\matlab.py", line 1156, 
in savefig
    manager.canvas.print_figure(*args, **kwargs)
  File 
"C:\Python22\Lib\site-packages\matplotlib\backends\backend_ps.py", line 
378, in print_figure
    self.figure.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\figure.py", line 128, 
in draw
    for a in self.axes: a.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\axes.py", line 603, in draw
    self.xaxis.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\axis.py", line 463, in draw
    tick.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\axis.py", line 125, in draw
    if midPoint and self.tick1On: self.tick1line.draw(renderer)
  File "C:\Python22\Lib\site-packages\matplotlib\lines.py", line 193, in 
draw
    self._lineFunc(renderer, gc, xt, yt)
  File "C:\Python22\Lib\site-packages\matplotlib\lines.py", line 326, in 
_draw_solid
    renderer.draw_lines(gc, xt,yt)
  File 
"C:\Python22\Lib\site-packages\matplotlib\backends\backend_ps.py", line 
103, in draw_lines
    ps.append('newpath %s moveto' % _nums_to_str((x[0], y[0])))
  File 
"C:\Python22\Lib\site-packages\matplotlib\backends\backend_ps.py", line 
36, in _nums_to_str
    return ' '.join([_int_or_float(val, fmt) for val in seq])
  File 
"C:\Python22\Lib\site-packages\matplotlib\backends\backend_ps.py", line 
41, in _int_or_float
    ival = int(val)
TypeError: can't convert complex to int; use e.g. int(abs(z))

Re: [Matplotlib-users] bug somewhere called by draw_lines

[John H. <jdh...@ac...>]

>>>>> "Andrew" == Andrew Straw <str...@as...> writes:

    Andrew> matplotlib 0.54 numarray 0.9 python 2.2.1 windows XP

    Andrew> if I use WXAgg or Agg, I get this:

Hmm, this is an I-can't-replicate-your-bugs-day.

Using numarray 0.8 or 0.9 with matplotlib on linux, setting numerix :
numarray in my rc file, I have no troubles with your script on any of
a variety of backends.  

Apparently the data coming from the numerix transform is complex.  The
line that is failing for you is a tickline (as indicated by your
traceback).  These lines are small so it would be interesting to see
by printing them if they are complex before of after being handed off
to the transformation.  In site-packages/matplotlib/lines.py on line
180, replace

        xt, yt = self._transform.numerix_x_y(x, y)

with
        print 'before', x, y
        xt, yt = self._transform.numerix_x_y(x, y)
        print 'after', xt, yt

and let me know what happens.  If they are complex before then it
appears complex data is being passed in; in this case try printing x,y
in your script

  x = a*cos( theta )*exp(b*theta)
  y = a*sin( theta )*exp(b*theta)
  print 'x', x
  print 'y', y

to see if you can find where these complexes are coming from.

Thanks,
JDH

Re: [Matplotlib-users] bug somewhere called by draw_lines

[Todd M. <jm...@st...>]

On Fri, 2004-05-21 at 10:38, John Hunter wrote:
> >>>>> "Andrew" == Andrew Straw <str...@as...> writes:
> 
>     Andrew> matplotlib 0.54 numarray 0.9 python 2.2.1 windows XP
> 
>     Andrew> if I use WXAgg or Agg, I get this:
> 
> Hmm, this is an I-can't-replicate-your-bugs-day.

I'm sorry I'm just catching up with this now.  I made an error building
matplotlib-0.54 for numarray on windows and the original version I sent
John basically doesn't work with numarray-0.9, just numarray-CVS.  The
nature of the error is that function calls from C extensions to numarray
are totally mismatched so all bets are off as to what extensions
actually wind up doing.

Sorry for the inconvenience,
Todd Miller


> Using numarray 0.8 or 0.9 with matplotlib on linux, setting numerix :
> numarray in my rc file, I have no troubles with your script on any of
> a variety of backends.  
> 
> Apparently the data coming from the numerix transform is complex.  The
> line that is failing for you is a tickline (as indicated by your
> traceback).  These lines are small so it would be interesting to see
> by printing them if they are complex before of after being handed off
> to the transformation.  In site-packages/matplotlib/lines.py on line
> 180, replace
> 
>         xt, yt = self._transform.numerix_x_y(x, y)
> 
> with
>         print 'before', x, y
>         xt, yt = self._transform.numerix_x_y(x, y)
>         print 'after', xt, yt
> 
> and let me know what happens.  If they are complex before then it
> appears complex data is being passed in; in this case try printing x,y
> in your script
> 
>   x = a*cos( theta )*exp(b*theta)
>   y = a*sin( theta )*exp(b*theta)
>   print 'x', x
>   print 'y', y
> 
> to see if you can find where these complexes are coming from.
> 
> Thanks,
> JDH
> 
> 
> 
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Todd Miller <jm...@st...>