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+ https://en.wikipedia.org/wiki/Error_function#Inverse_functions
+ http://functions.wolfram.com/GammaBetaErf/InverseErf/
Examples
--------
>>> round(erfinv(0.1), 12)
0.088855990494
>>> round(erfinv(0.5), 12)
0.476936276204
>>> round(erfinv(-0.5), 12)
-0.476936276204
>>> round(erfinv(0.95), 12)
1.38590382435
>>> round(erf(erfinv(0.3)), 3)
0.3
>>> round(erfinv(erf(0.5)), 3)
0.5
>>> erfinv(0)
0
>>> erfinv(1)
inf
>>> erfinv(-1)
-inf
""""""
if abs(z) > 1:
raise ValueError(""`z` must be between -1 and 1 inclusive"")
# Shortcut special cases
if z == 0:
return 0
if z == 1:
return inf
if z == -1:
return -inf
# otherwise calculate things.
return _ndtri((z + 1) / 2.0) / math.sqrt(2)"
1034,"def get_cmap(name, lut=None):
""""""
Returns the specified colormap.
Parameters
----------
name: str or :class:`matplotlib.colors.Colormap`
If a colormap, it returned unchanged.
%(cmap_note)s
lut: int
An integer giving the number of entries desired in the lookup table
Returns
-------
matplotlib.colors.Colormap
The colormap specified by `name`
See Also
--------
show_colormaps: A function to display all available colormaps
Notes
-----
Different from the :func::`matpltolib.pyplot.get_cmap` function, this
function changes the number of colors if `name` is a
:class:`matplotlib.colors.Colormap` instance to match the given `lut`.""""""
if name in rcParams['colors.cmaps']:
colors = rcParams['colors.cmaps'][name]
lut = lut or len(colors)
return FixedColorMap.from_list(name=name, colors=colors, N=lut)
elif name in _cmapnames:
colors = _cmapnames[name]
lut = lut or len(colors)
return FixedColorMap.from_list(name=name, colors=colors, N=lut)
else:
cmap = mpl_get_cmap(name)
# Note: we could include the `lut` in the call of mpl_get_cmap, but
# this raises a ValueError for colormaps like 'viridis' in mpl version
# 1.5. Besides the mpl_get_cmap function does not modify the lut if
# it does not match
if lut is not None and cmap.N != lut:
cmap = FixedColorMap.from_list(
name=cmap.name, colors=cmap(np.linspace(0, 1, lut)), N=lut)
return cmap"
1035,"def _get_cmaps(names):
""""""Filter the given `names` for colormaps""""""
import matplotlib.pyplot as plt
available_cmaps = list(
chain(plt.cm.cmap_d, _cmapnames, rcParams['colors.cmaps']))
names = list(names)
wrongs = []
for arg in (arg for arg in names if (not isinstance(arg, Colormap) and
arg not in available_cmaps)):
if isinstance(arg, str):
similarkeys = get_close_matches(arg, available_cmaps)
if similarkeys != []:
warn(""Colormap %s not found in standard colormaps.\n""
""Similar colormaps are %s."" % (arg, ', '.join(similarkeys)))
else:
warn(""Colormap %s not found in standard colormaps.\n""
""Run function without arguments to see all colormaps"" % arg)
names.remove(arg)
wrongs.append(arg)