Re: [Matplotlib-users] Problem with errorbar and log axis

[Yuxiang W. <yw...@vi...>]

Typo - "standard deviation OR standard error of mean", not "OF".

Sorry.

Shawn


On Tue, Apr 7, 2015 at 10:39 AM, Yuxiang Wang <yw...@vi...> wrote:
> If you error bars denote standard deviation of standard error of mean,
> shouldn't they be non-symmetric in log scale?
>
> Shawn
>
> On Tue, Apr 7, 2015 at 10:11 AM, Markus Haider <mar...@ui...> wrote:
>> Hi,
>>
>> I am trying to make an errorbar plot with a logarithmic x-axis. I have
>> symmetric errors in logspace, however if I plot them, the errors are not
>> symmetric anymore, as you can see in the enclosed image. Am I
>> misunderstanding something or is this a bug?
>>
>> Thanks for your help,
>> Markus
>>
>> Here the code I used to produce the plot:
>>
>> import matplotlib.pyplot as plt
>>
>> import numpy as np
>>
>> data_x_log = np.array([13.0,15.0])
>>
>> data_y = np.array([0.5,1])
>>
>> error_x_log = np.array([0.5,1.])
>>
>> error_x_lower = 10**(data_x_log-error_x_log)
>>
>> error_x_upper = 10**(data_x_log+error_x_log)
>>
>> fig = plt.figure()
>>
>> ax = fig.add_subplot(111)
>>
>> ax.errorbar(10**data_x_log,data_y,xerr=[error_x_lower,error_x_upper],ls='',marker='o')
>>
>> ax.set_xscale('log')
>>
>> ax.set_xlim([1E11,1E17])
>>
>> ax.set_ylim([0,2])
>>
>> plt.savefig('error.png')
>>
>>
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>
>
>
> --
> Yuxiang "Shawn" Wang
> Gerling Research Lab
> University of Virginia
> yw...@vi...
> +1 (434) 284-0836
> https://sites.google.com/a/virginia.edu/yw5aj/



-- 
Yuxiang "Shawn" Wang
Gerling Research Lab
University of Virginia
yw...@vi...
+1 (434) 284-0836
https://sites.google.com/a/virginia.edu/yw5aj/