LaTeX error on semilogy + usetex + SubplotHost

Hi,

I ran into a bug where I get the LaTeX error:

RuntimeError: LaTeX was not able to process the following string:

''

I know it's an uncommon plot, but I need extra (non-uniform) tick labels at the top so I'm using SubplotHost, on a semilog plot with usetex (so the fonts look similar to the ones on the paper).

Matplotlib svn r8330 on Ubuntu 9.10.

Regards,
Jo�o Silva

Example script: -------------------------------------

from matplotlib import rc
rc('text', usetex=True)

from mpl_toolkits.axes_grid.parasite_axes import SubplotHost
import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure(1)
ax = SubplotHost(fig, 111)
fig.add_subplot(ax)
x = np.arange(1.0,10.0,0.1)
ax.semilogy(x,x**2)
plt.show()

···

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

I cannot reproduce this error.
I'm using r8330 on Linux.

I guess the error does not occur when you use a normal subplot?

Just in case, replace axes_grid with axes_grid1 and see if it makes
any difference, i.e.,

from mpl_toolkits.axes_grid1.parasite_axes import SubplotHost

Regards,

-JJ

···

On Thu, May 20, 2010 at 2:11 PM, João Luís Silva <jsilva@...3114....> wrote:

Hi,

I ran into a bug where I get the LaTeX error:

RuntimeError: LaTeX was not able to process the following string:

''

I know it's an uncommon plot, but I need extra (non-uniform) tick labels
at the top so I'm using SubplotHost, on a semilog plot with usetex (so
the fonts look similar to the ones on the paper).

Matplotlib svn r8330 on Ubuntu 9.10.

Regards,
João Silva

Example script: -------------------------------------

from matplotlib import rc
rc('text', usetex=True)

from mpl_toolkits.axes_grid.parasite_axes import SubplotHost
import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure(1)
ax = SubplotHost(fig, 111)
fig.add_subplot(ax)
x = np.arange(1.0,10.0,0.1)
ax.semilogy(x,x**2)
plt.show()

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

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

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

The following patch avoids the error with your attached plot. I'm sure if it the right fix though -- I'm not sure why empty strings are being sent this far along, and I'm also not seeing any ticks along the top.

Mike

Index: lib/matplotlib/texmanager.py

···

===================================================================
--- lib/matplotlib/texmanager.py (revision 8329)
+++ lib/matplotlib/texmanager.py (working copy)
@@ -578,6 +578,9 @@
          return width, heigth and descent of the text.
          """

+ if tex.strip() == '':
+ return 0, 0, 0
+
          if renderer:
              dpi_fraction = renderer.points_to_pixels(1.)
          else:

On 05/20/2010 02:11 PM, Jo�o Lu�s Silva wrote:

from matplotlib import rc
rc('text', usetex=True)

from mpl_toolkits.axes_grid.parasite_axes import SubplotHost
import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure(1)
ax = SubplotHost(fig, 111)
fig.add_subplot(ax)
x = np.arange(1.0,10.0,0.1)
ax.semilogy(x,x**2)
plt.show()
   
--
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA

The error may be dependent on the version of latex being used. Yours may be handling the empty content just fine. (I'm using TexLive 2009 on RHEL5).

Mike

···

On 05/20/2010 02:34 PM, Jae-Joon Lee wrote:

I cannot reproduce this error.
I'm using r8330 on Linux.

I guess the error does not occur when you use a normal subplot?

Just in case, replace axes_grid with axes_grid1 and see if it makes
any difference, i.e.,

from mpl_toolkits.axes_grid1.parasite_axes import SubplotHost

Regards,

-JJ

On Thu, May 20, 2010 at 2:11 PM, João Luís Silva<jsilva@...668...> wrote:
   

Hi,

I ran into a bug where I get the LaTeX error:

RuntimeError: LaTeX was not able to process the following string:

''

I know it's an uncommon plot, but I need extra (non-uniform) tick labels
at the top so I'm using SubplotHost, on a semilog plot with usetex (so
the fonts look similar to the ones on the paper).

Matplotlib svn r8330 on Ubuntu 9.10.

Regards,
João Silva

Example script: -------------------------------------

from matplotlib import rc
rc('text', usetex=True)

from mpl_toolkits.axes_grid.parasite_axes import SubplotHost
import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure(1)
ax = SubplotHost(fig, 111)
fig.add_subplot(ax)
x = np.arange(1.0,10.0,0.1)
ax.semilogy(x,x**2)
plt.show()

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

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

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

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

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
   
--
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA

It turns out that when axes_grid toolkit is used and there are some
ticks does not have associated ticklabels (i.e., minor ticks), it
tries to call the "get_texts_widths_heights_descents" method with
empty string.
The following patch prevent this.

--- a/lib/mpl_toolkits/axisartist/axis_artist.py
+++ b/lib/mpl_toolkits/axisartist/axis_artist.py
@@ -769,6 +769,7 @@ class TickLabels(AxisLabel, AttributeCopier): # mtext.Text
         #self._set_offset_radius(r)

         for (x, y), a, l in self._locs_angles_labels:
+ if not l.strip(): continue
             self._set_ref_angle(a) #+ add_angle
             self.set_x(x)
             self.set_y(y)
@@ -811,6 +812,7 @@ class TickLabels(AxisLabel, AttributeCopier): # mtext.Text
         """
         whd_list = []
         for (x, y), a, l in self._locs_angles_labels:
+ if not l.strip(): continue
             clean_line, ismath = self.is_math_text(l)
             whd = renderer.get_text_width_height_descent(
                 clean_line, self._fontproperties, ismath=ismath)

But it may be still safer to return 0,0,0 when empty string is given
for *get_texts_widths_heights_descents*?
Regards,

-JJ

···

On Thu, May 20, 2010 at 2:36 PM, Michael Droettboom <mdroe@...86...> wrote:

The following patch avoids the error with your attached plot. I'm sure
if it the right fix though -- I'm not sure why empty strings are being
sent this far along, and I'm also not seeing any ticks along the top.

Mike

Index: lib/matplotlib/texmanager.py

--- lib/matplotlib/texmanager.py (revision 8329)
+++ lib/matplotlib/texmanager.py (working copy)
@@ -578,6 +578,9 @@
return width, heigth and descent of the text.
"""

+ if tex.strip() == '':
+ return 0, 0, 0
+
if renderer:
dpi_fraction = renderer.points_to_pixels(1.)
else:

On 05/20/2010 02:11 PM, João Luís Silva wrote:

from matplotlib import rc
rc('text', usetex=True)

from mpl_toolkits.axes_grid.parasite_axes import SubplotHost
import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure(1)
ax = SubplotHost(fig, 111)
fig.add_subplot(ax)
x = np.arange(1.0,10.0,0.1)
ax.semilogy(x,x**2)
plt.show()

--
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA

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

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Jae-Joon Lee wrote:

I cannot reproduce this error.
I'm using r8330 on Linux.

I guess the error does not occur when you use a normal subplot?

Just in case, replace axes_grid with axes_grid1 and see if it makes
any difference, i.e.,

from mpl_toolkits.axes_grid1.parasite_axes import SubplotHost

Regards,

-JJ

I've tried axes_grid1 and it works well. I'm using the default latex (Ubuntu 9.10)

latex --version
pdfTeX using libpoppler 3.141592-1.40.3-2.2 (Web2C 7.5.6)
[etc.]

Both the patches presented fixed the problem, thanks.

João Silva