SF.net SVN: matplotlib:[6232] trunk/matplotlib/lib/matplotlib/transforms.py

[<ef...@us...>]

Revision: 6232
          http://matplotlib.svn.sourceforge.net/matplotlib/?rev=6232&view=rev
Author:   efiring
Date:     2008-10-16 21:21:58 +0000 (Thu, 16 Oct 2008)

Log Message:
-----------
Make transforms.nonsingular handle inf and nan sensibly.
Without this, trying to plot a line with all data masked would
raise an exception via the autoscaling.

Modified Paths:
--------------
    trunk/matplotlib/lib/matplotlib/transforms.py

Modified: trunk/matplotlib/lib/matplotlib/transforms.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/transforms.py	2008-10-16 20:58:07 UTC (rev 6231)
+++ trunk/matplotlib/lib/matplotlib/transforms.py	2008-10-16 21:21:58 UTC (rev 6232)
@@ -2157,7 +2157,7 @@
 
 def nonsingular(vmin, vmax, expander=0.001, tiny=1e-15, increasing=True):
     '''
-    Ensure the endpoints of a range are not too close together.
+    Ensure the endpoints of a range are finite and not too close together.
 
     "too close" means the interval is smaller than 'tiny' times
     the maximum absolute value.
@@ -2165,7 +2165,11 @@
     If they are too close, each will be moved by the 'expander'.
     If 'increasing' is True and vmin > vmax, they will be swapped,
     regardless of whether they are too close.
+
+    If either is inf or -inf or nan, return - expander, expander.
     '''
+    if (not np.isfinite(vmin)) or (not np.isfinite(vmax)):
+        return -expander, expander
     swapped = False
     if vmax < vmin:
         vmin, vmax = vmax, vmin


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