David Fokkema <dfokkema@...1511...> writes:
If I choose center, the result is that my histogram is calculated
for edge values but the bars are placed at center values which is
completely misleading and wrong! I'd say this is a bug, but I may be
overlooking something here...
Looks like a bug to me. Could you file it at
http://sf.net/tracker/?group_id=80706&atid=560720
so it isn't forgotten?
--
Jouni K. Sepp�nen
http://www.iki.fi/jks
Well... It couldn't be too hard to fix, I guess... I know python, I
tracked down the source, I could try and fix it, right? I think I'll
have the time next Tuesday, so hopefully I'll file a bug report with an
attached patch, 
On Fri, 2007-04-06 at 18:32 +0300, Jouni K. Seppänen wrote:
David Fokkema <dfokkema@...1511...> writes:
> If I choose center, the result is that my histogram is calculated
> for edge values but the bars are placed at center values which is
> completely misleading and wrong! I'd say this is a bug, but I may be
> overlooking something here...Looks like a bug to me. Could you file it at
http://sf.net/tracker/?group_id=80706&atid=560720
so it isn't forgotten?
I fixed the bug, I think. At least it's working on my system and I think
it is not invasive. Comments please? I'll send it upstream otherwise...
--- matplotlib/axes.py.orig 2007-04-10 10:58:30.000000000 +0200
+++ matplotlib/axes.py 2007-04-10 11:14:56.000000000 +0200
@@ -4149,7 +4149,7 @@
hist bars
"""
if not self._hold: self.cla()
- n, bins = matplotlib.mlab.hist(x, bins, normed)
+ n, bins = matplotlib.mlab.hist(x, bins, normed, align)
if width is None: width = 0.9*(bins[1]-bins[0])
if orientation == 'horizontal':
patches = self.barh(bins, n, height=width, left=bottom,
align=align)
--- matplotlib/mlab.py.orig 2007-04-10 11:16:23.000000000 +0200
+++ matplotlib/mlab.py 2007-04-10 11:24:48.000000000 +0200
@@ -597,7 +597,7 @@
#S = -1.0*asum(p*log(p))
return S
-def hist(y, bins=10, normed=0):
+def hist(y, bins=10, normed=0, align='edge'):
"""
Return the histogram of y with bins equally sized bins. If bins
is an array, use the bins. Return value is
@@ -626,11 +626,16 @@
dy = (ymax-ymin)/bins
bins = ymin + dy*arange(bins)
+ if align == 'center':
+ hw = .5*(bins[1]-bins[0])
+ nbins = [x-hw for x in bins]
+ else:
+ nbins = bins
- n = searchsorted(sort(y), bins)
+ n = searchsorted(sort(y), nbins)
n = diff(concatenate([n, [len(y)]]))
if normed:
- db = bins[1]-bins[0]
+ db = nbins[1]-nbins[0]
return 1/(len(y)*db)*n, bins
else:
return n, bins
Thanks,
David
On Sun, 2007-04-08 at 19:25 +0200, David Fokkema wrote:
On Fri, 2007-04-06 at 18:32 +0300, Jouni K. Seppänen wrote:
> David Fokkema <dfokkema@...1511...> writes:
>
> > If I choose center, the result is that my histogram is calculated
> > for edge values but the bars are placed at center values which is
> > completely misleading and wrong! I'd say this is a bug, but I may be
> > overlooking something here...
>
> Looks like a bug to me. Could you file it at
> http://sf.net/tracker/?group_id=80706&atid=560720
> so it isn't forgotten?Well... It couldn't be too hard to fix, I guess... I know python, I
tracked down the source, I could try and fix it, right? I think I'll
have the time next Tuesday, so hopefully I'll file a bug report with an
attached patch,