Hi all, there seems to be a bug in in pyplot.hist when using histtype="step". I am plotting the attached data to a histogram (see 1.png). In this case I set the limits on the y axis manually. When I don't do this (let the hist function choose the limits), I get the picture in the file 2.png. Only the highest bin is drawn. To be exact, ymin=second highest value, ymax=highest value. To solve this, I suggest the patch in the attachment. I also removed the for loop here, because I don't see why 0 height bins should be filtered out (but this is just a suggestion). cheers, Detlef Maurel
Hi, Le 16/04/2013 12:14, Detlef Maurel (IKP) a écrit : > there seems to be a bug in in pyplot.hist when using histtype="step". > > I am plotting the attached data to a histogram (see 1.png). In this > case I set the limits on the y axis manually. > > When I don't do this (let the hist function choose the limits), I get > the picture in the file 2.png. Only the highest bin is drawn. To be > exact, ymin=second highest value, ymax=highest value. Can you also send a minimal code that reproduces the bug. I just tried a hist(x, histtype='step') command, with x being a random vector and it works fine. best, Pierre
On 16.04.2013 14:58, Pierre Haessig wrote:
> Hi,
>
> Le 16/04/2013 12:14, Detlef Maurel (IKP) a écrit :
>> there seems to be a bug in in pyplot.hist when using histtype="step".
>>
>> I am plotting the attached data to a histogram (see 1.png). In this
>> case I set the limits on the y axis manually.
>>
>> When I don't do this (let the hist function choose the limits), I get
>> the picture in the file 2.png. Only the highest bin is drawn. To be
>> exact, ymin=second highest value, ymax=highest value.
> Can you also send a minimal code that reproduces the bug. I just tried a
> hist(x, histtype='step') command, with x being a random vector and it
> works fine.
>
this works for me, too. Strange... I get the problem with the attached
dataset using the command
hist(loadtxt("data.txt"),bins=300,histtype="step")
When I plot only a subset of the data (first/second/third/... thousand
numbers),
the histogram looks fine. It seems it gets wrong when more than roughly
2000 numbers are used.
I will try to dig more into this and let you know if I find something.
cheers
Detlef
Hi,
Le 16/04/2013 15:41, Detlef Maurel (IKP) a écrit :
> this works for me, too. Strange... I get the problem with the attached
> dataset using the command
>
> hist(loadtxt("data.txt"),bins=300,histtype="step")
Indeed, I could reproduce your problem using your specific dataset.
The automated selection of ylim is not working as expected, and I don't
know why !
best,
Pierre