John, I can't reproduce the error on my intel macbook. Anyhow, it seems to me a bug in the code and bugs in numpy. (I'm using numpy version 1.1.1, and I'm not sure these bugs are fixed in newer numpy. ) Can you try the patch below and see if this fix your problem? -JJ Index: lib/matplotlib/scale.py =================================================================== --- lib/matplotlib/scale.py (revision 6487) +++ lib/matplotlib/scale.py (working copy) @@ -301,7 +301,8 @@ self._linadjust = (np.log(linthresh) / self._log_base) / linthre def transform(self, a): - sign = np.sign(np.asarray(a)) + a = np.asarray(a) + sign = np.sign(a) masked = ma.masked_inside(a, -self.linthresh, self.linthresh, co False) log = sign * ma.log(np.abs(masked)) / self._log_base if masked.mask.any(): @@ -328,6 +329,7 @@ self._linadjust = linthresh / (np.log(linthresh) / self._log_bas def transform(self, a): + a = np.asarray(a) return np.where(a <= self._log_linthresh, np.where(a >= -self._log_linthresh, On Sat, Dec 6, 2008 at 5:09 PM, John Hunter <jd...@gm...> wrote: > There appears to be a bug in the 3rd subplot of symlog_demo.py because > the ticker is generating an OverflowError on my powerbook. > > The problem is in SymmetricalLogLocator.__call__ when the vmin, vmax = > self._transform.transform((vmin, vmax)) call transforms > vmin,vmax=[-1,1] to [-3.30039237078e+17,1.0] numdec is set to > 3.30039237078e+17. Then the while loop runs until I kill the job:: > > stride = 1 > while numdec/stride+1 > self.numticks: > stride += 1 > > This may have something to do with a platform specific floating point > computations, because I am seeing different results on a linux box I > am also testing on, but even there the results don't look right. For > example, on that box, a 64 bit linux machine, I see [-1,1] transformed > to [2.18190930577e-316, 6.90437063896e-310] and numdec=-1 but the > example does run w/o crashing. > > In any case, it looks like there is some non-robust computation going > on, and I'm hoping Michael has a quick insight :-) > > JDH > > ------------------------------------------------------------------------------ > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > _______________________________________________ > Matplotlib-devel mailing list > Mat...@li... > https://lists.sourceforge.net/lists/listinfo/matplotlib-devel >