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Backport PR #17664 on branch v3.3.x (Clarify docs of AutoDateLocator.intervald) #17677

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Merged
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Jun 19, 2020
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Backport PR #17664 on branch v3.3.x (Clarify docs of AutoDateLocator.intervald) #17677

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14 changes: 10 additions & 4 deletions lib/matplotlib/dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1215,14 +1215,14 @@ class AutoDateLocator(DateLocator):
----------
intervald : dict

Mapping of tick frequencies (a constant from dateutil.rrule) to
multiples allowed for that ticking. The default looks like this::
Mapping of tick frequencies to multiples allowed for that ticking.
The default is ::

self.intervald = {
YEARLY : [1, 2, 4, 5, 10, 20, 40, 50, 100, 200, 400, 500,
1000, 2000, 4000, 5000, 10000],
MONTHLY : [1, 2, 3, 4, 6],
DAILY : [1, 2, 3, 7, 14],
DAILY : [1, 2, 3, 7, 14, 21],
HOURLY : [1, 2, 3, 4, 6, 12],
MINUTELY: [1, 5, 10, 15, 30],
SECONDLY: [1, 5, 10, 15, 30],
Expand All @@ -1231,10 +1231,16 @@ class AutoDateLocator(DateLocator):
100000, 200000, 500000, 1000000],
}

where the keys are defined in `dateutil.rrule`.

The interval is used to specify multiples that are appropriate for
the frequency of ticking. For instance, every 7 days is sensible
for daily ticks, but for minutes/seconds, 15 or 30 make sense.
You can customize this dictionary by doing::

When customizing, you should only modify the values for the existing
keys. You should not add or delete entries.

Example for forcing ticks every 3 hours::

locator = AutoDateLocator()
locator.intervald[HOURLY] = [3] # only show every 3 hours
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