diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
index ac0b33bc13c8..05d30f38fc70 100644
--- a/lib/matplotlib/dates.py
+++ b/lib/matplotlib/dates.py
@@ -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],
@@ -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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