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hist plot in percent #320

Closed
ddale opened this Issue · 9 comments

8 participants

@ddale
Owner

Original report at SourceForge, opened Mon Apr 20 04:48:03 2009

except for normed=1 there is no way to control the y output of hist.
being able to specify an output in percent would be useful.

hist(x, percent=1)
plots y/n*100 histograms

@pelson
Collaborator

Clarification: Implement a "percent" option on hist.
As a workaround, one could just use the normed with a custom formatter:

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker as mticker

plt.hist(np.linspace(0.1, 5.5, 1000), normed=True, bins=range(10))
formatter = mticker.FuncFormatter(lambda v, pos: str(v * 100))
plt.gca().yaxis.set_major_formatter(formatter)

plt.show()

I can't say I am that keen to implement another keyword on the hist function. Thoughts?

@WeatherGod
Collaborator

Me neither. This is more of a formatter issue than anything else. If anything, we could add an example to the gallery or even the hist api docs.

@pelson
Collaborator

Good idea. We don't have access to the original author, but lets make the action of this issue to: "Put an example of making a percentage histogram in the mpl gallery".

I'm not sure if its best to use locators for this, or if some clever use of scales might be appropriate.

@mdboom
Owner

Ok -- and I think if the action is to just create a new example, we can reasonably get this in 1.2, so I'm marking it for that milestone.

@mdboom
Owner

Closed by #1149.

@mdboom mdboom closed this
@kermit666

Is there any chance of extending the API to accept the percent=1 parameter as @ddale suggested? I saw your example introduced in #1149 and I really don't like the idea of adding so much code just to have yticks as percentages - the normal, textbook way of annotating histograms.

@zcesc01

I deffinetly agree with kermit666
it would have been great if it was as simple as adding percent=1 (especially that it is very common for histograms to be plotted in percentage)

@tacaswell
Owner

It is unlikely that we will add this, the signature for hist is awful enough as it is. We already have a normed kwarg, how would we deal with the case where the user passes in both normed and percent?

A better route might be to add a normed_value kwarg which defaults to 1 such that the result is rescaled so that it integrates to normed_value.

I have never plotted a histogram in percent so I contest the assertions that this is the 'textbook' or even a common thing.

@neggert, comments?

@neggert

This is similar to #1567. I think my thoughts are summed up towards the end of that thread.

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