boxplot() draws (min, max) whiskers after a zero-IQR input regardless of whis value

[barusan]

When pyplot.boxplot() receives a list of lists one of that is zero-IQR as input X, box and whisker plots of subsequent columns of X will have (min, max) whisker regardless of the value of whis.

For example,

X = [data, [0.5], data]     
plt.boxplot(X) # whis = 1.5, flier points should be plotted for the first and third columns of X.

the script like above will draw the following figure.

I suspect this commit.

[WeatherGod]

Good catch! I think I see what is wrong here. The "whis" variable is
incorrectly modified in the for-loop, and so it has the third list item's
"whis" is set to "range" because that is what the value got forced into
with the second dataset.

On Thu, Sep 4, 2014 at 9:01 AM, バル notifications@github.com wrote:

When pyplot.boxplot() receives a list of lists one of that is zero-IQR as
input X, box and whisker plots of subsequent columns of X will have (min,
max) whisker regardless of the value of whis.

Sample code to reproduce this (possible) bug:
X = [data, [0.5], data]

plt.boxplot(X)

[image: plt]
https://cloud.githubusercontent.com/assets/580998/4149388/39d6b394-3433-11e4-9c0e-ab13db034608.png

I suspect this commit
7cf8b35
.

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#3468.

[tacaswell]

Probably related to #3459

[kay10]

If the input whis value is sequence of percentiles e.g. [5,95], a zero IQR will set whiskers to min/max value as whis = 'range', which is not desirable. You were trying to solve same problem here too.

[tacaswell]

@kay10 Can you move this discussion over to #5331 then?