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The classes here provide support for using custom classes with
Matplotlib, e.g., those that do not expose the array interface but know
how to convert themselves to arrays. It also supports classes with
units and units conversion. Use cases include converters for custom
objects, e.g., a list of datetime objects, as well as for objects that
are unit aware. We don't assume any particular units implementation;
rather a units implementation must register with the Registry converter
dictionary and provide a `ConversionInterface`. For example,
here is a complete implementation which supports plotting with native
datetime objects::
import matplotlib.units as units
import matplotlib.dates as dates
import matplotlib.ticker as ticker
import datetime
class DateConverter(units.ConversionInterface):
@staticmethod
def convert(value, unit, axis):
"Convert a datetime value to a scalar or array."
return dates.date2num(value)
@staticmethod
def axisinfo(unit, axis):
"Return major and minor tick locators and formatters."
if unit != 'date':
return None
majloc = dates.AutoDateLocator()
majfmt = dates.AutoDateFormatter(majloc)
return units.AxisInfo(majloc=majloc, majfmt=majfmt, label='date')
@staticmethod
def default_units(x, axis):
"Return the default unit for x or None."
return 'date'
# Finally we register our object type with the Matplotlib units registry.
units.registry[datetime.date] = DateConverter()
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Return whether *x* is of a type that Matplotlib natively supports or an
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Information to support default axis labeling, tick labeling, and limits.
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Parameters
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majloc, minloc : Locator, optional
Tick locators for the major and minor ticks.
majfmt, minfmt : Formatter, optional
Tick formatters for the major and minor ticks.
label : str, optional
The default axis label.
default_limits : optional
The default min and max limits of the axis if no data has
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Convert *obj* using *unit* for the specified *axis*.
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The Matplotlib datalim, autoscaling, locators etc work with scalars
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converter may be passed these floats, or arrays of them, even when
units are set.
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