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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

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<title>matplotlib.gridspec — Matplotlib 3.1.1 documentation</title>

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<div style="float: left; position: absolute; width: 496px; bottom: 0; padding-bottom: 24px">Version 3.1.1</div>

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<h1>Source code for matplotlib.gridspec</h1><div class="highlight"><pre>

r"""

:mod:`~matplotlib.gridspec` contains classes that help to layout multiple

`~axes.Axes` in a grid-like pattern within a figure.

The `GridSpec` specifies the overall grid structure. Individual cells within

the grid are referenced by `SubplotSpec`\s.

See the tutorial :ref:`sphx_glr_tutorials_intermediate_gridspec.py` for a

comprehensive usage guide.

"""

import copy

import logging

import numpy as np

import matplotlib as mpl

from matplotlib import _pylab_helpers, cbook, tight_layout, rcParams

from matplotlib.transforms import Bbox

import matplotlib._layoutbox as layoutbox

_log = logging.getLogger(__name__)

<div class="viewcode-block" id="GridSpecBase"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase">[docs]</a>class GridSpecBase(object):

"""

A base class of GridSpec that specifies the geometry of the grid

that a subplot will be placed.

"""

def __init__(self, nrows, ncols, height_ratios=None, width_ratios=None):

"""

The number of rows and number of columns of the grid need to

be set. Optionally, the ratio of heights and widths of rows and

columns can be specified.

"""

self._nrows, self._ncols = nrows, ncols

self.set_height_ratios(height_ratios)

self.set_width_ratios(width_ratios)

def __repr__(self):

height_arg = (', height_ratios=%r' % self._row_height_ratios

if self._row_height_ratios is not None else '')

width_arg = (', width_ratios=%r' % self._col_width_ratios

if self._col_width_ratios is not None else '')

return '{clsname}({nrows}, {ncols}{optionals})'.format(

clsname=self.__class__.__name__,

nrows=self._nrows,

ncols=self._ncols,

optionals=height_arg + width_arg,

)

<div class="viewcode-block" id="GridSpecBase.get_geometry"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase.get_geometry">[docs]</a> def get_geometry(self):

"""

Return a tuple containing the number of rows and columns in the grid.

"""

return self._nrows, self._ncols</div>

<div class="viewcode-block" id="GridSpecBase.get_subplot_params"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase.get_subplot_params">[docs]</a> def get_subplot_params(self, figure=None, fig=None):

pass</div>

<div class="viewcode-block" id="GridSpecBase.new_subplotspec"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase.new_subplotspec">[docs]</a> def new_subplotspec(self, loc, rowspan=1, colspan=1):

"""Create and return a `.SubplotSpec` instance."""

loc1, loc2 = loc

subplotspec = self[loc1:loc1+rowspan, loc2:loc2+colspan]

return subplotspec</div>

<div class="viewcode-block" id="GridSpecBase.set_width_ratios"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase.set_width_ratios">[docs]</a> def set_width_ratios(self, width_ratios):

if width_ratios is not None and len(width_ratios) != self._ncols:

raise ValueError('Expected the given number of width ratios to '

'match the number of columns of the grid')

self._col_width_ratios = width_ratios</div>

<div class="viewcode-block" id="GridSpecBase.get_width_ratios"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase.get_width_ratios">[docs]</a> def get_width_ratios(self):

return self._col_width_ratios</div>

<div class="viewcode-block" id="GridSpecBase.set_height_ratios"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase.set_height_ratios">[docs]</a> def set_height_ratios(self, height_ratios):

if height_ratios is not None and len(height_ratios) != self._nrows:

raise ValueError('Expected the given number of height ratios to '

'match the number of rows of the grid')

self._row_height_ratios = height_ratios</div>

<div class="viewcode-block" id="GridSpecBase.get_height_ratios"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase.get_height_ratios">[docs]</a> def get_height_ratios(self):

return self._row_height_ratios</div>

<div class="viewcode-block" id="GridSpecBase.get_grid_positions"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpecBase.html#matplotlib.gridspec.GridSpecBase.get_grid_positions">[docs]</a> def get_grid_positions(self, fig, raw=False):

"""

Return lists of bottom and top position of rows, left and

right positions of columns.

If raw=True, then these are all in units relative to the container

with no margins. (used for constrained_layout).

"""

nrows, ncols = self.get_geometry()

if raw:

left = 0.

right = 1.

bottom = 0.

top = 1.

wspace = 0.

hspace = 0.

else:

subplot_params = self.get_subplot_params(fig)

left = subplot_params.left

right = subplot_params.right

bottom = subplot_params.bottom

top = subplot_params.top

wspace = subplot_params.wspace

hspace = subplot_params.hspace

tot_width = right - left

tot_height = top - bottom

# calculate accumulated heights of columns

cell_h = tot_height / (nrows + hspace*(nrows-1))

sep_h = hspace * cell_h

norm = cell_h * nrows / sum(self._row_height_ratios)

cell_heights = [r * norm for r in self._row_height_ratios]

else:

cell_heights = [cell_h] * nrows

sep_heights = [0] + ([sep_h] * (nrows-1))

cell_hs = np.cumsum(np.column_stack([sep_heights, cell_heights]).flat)

# calculate accumulated widths of rows

cell_w = tot_width / (ncols + wspace*(ncols-1))

sep_w = wspace * cell_w

norm = cell_w * ncols / sum(self._col_width_ratios)

cell_widths = [r * norm for r in self._col_width_ratios]

else:

cell_widths = [cell_w] * ncols

sep_widths = [0] + ([sep_w] * (ncols-1))

cell_ws = np.cumsum(np.column_stack([sep_widths, cell_widths]).flat)

fig_tops, fig_bottoms = (top - cell_hs).reshape((-1, 2)).T

fig_lefts, fig_rights = (left + cell_ws).reshape((-1, 2)).T

return fig_bottoms, fig_tops, fig_lefts, fig_rights</div>

def __getitem__(self, key):

"""Create and return a `.SubplotSpec` instance."""

def _normalize(key, size, axis): # Includes last index.

orig_key = key

if isinstance(key, slice):

start, stop, _ = key.indices(size)

if stop > start:

return start, stop - 1

raise IndexError("GridSpec slice would result in no space "

"allocated for subplot")

else:

if key < 0:

key = key + size

if 0 <= key < size:

return key, key

elif axis is not None:

raise IndexError(f"index {orig_key} is out of bounds for "

f"axis {axis} with size {size}")

else: # flat index

f"GridSpec with size {size}")

if isinstance(key, tuple):

try:

k1, k2 = key

except ValueError:

raise ValueError("unrecognized subplot spec")

num1, num2 = np.ravel_multi_index(

[_normalize(k1, nrows, 0), _normalize(k2, ncols, 1)],

(nrows, ncols))

else: # Single key

num1, num2 = _normalize(key, nrows * ncols, None)

return SubplotSpec(self, num1, num2)</div>

<div class="viewcode-block" id="GridSpec"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpec.html#matplotlib.gridspec.GridSpec">[docs]</a>class GridSpec(GridSpecBase):

"""

Specifies the geometry of the grid that a subplot can be placed in.

The location of grid is determined by similar way as the SubplotParams.

"""

def __init__(self, nrows, ncols, figure=None,

left=None, bottom=None, right=None, top=None,

wspace=None, hspace=None,

width_ratios=None, height_ratios=None):

"""

The number of rows and number of columns of the grid need to be set.

Optionally, the subplot layout parameters (e.g., left, right, etc.)

can be tuned.

Parameters

----------

nrows : int

Number of rows in grid.

ncols : int

Number or columns in grid.

figure : `~.figure.Figure`, optional

left, right, top, bottom : float, optional

Extent of the subplots as a fraction of figure width or height.

Left cannot be larger than right, and bottom cannot be larger than

top.

wspace : float, optional

The amount of width reserved for space between subplots,

expressed as a fraction of the average axis width.

hspace : float, optional

The amount of height reserved for space between subplots,

expressed as a fraction of the average axis height.

width_ratios : length *ncols* iterable, optional

Width ratios of the columns.

height_ratios : length *nrows* iterable, optional

Height ratios of the rows.

Notes

-----

See `~.figure.SubplotParams` for descriptions of the layout parameters.

"""

self.left = left

self.bottom = bottom

self.right = right

self.top = top

self.wspace = wspace

self.hspace = hspace

self.figure = figure

GridSpecBase.__init__(self, nrows, ncols,

width_ratios=width_ratios,

height_ratios=height_ratios)

if self.figure is None or not self.figure.get_constrained_layout():

self._layoutbox = None

else:

self.figure.init_layoutbox()

self._layoutbox = layoutbox.LayoutBox(

parent=self.figure._layoutbox,

name='gridspec' + layoutbox.seq_id(),

artist=self)

# by default the layoutbox for a gridspec will fill a figure.

# but this can change below if the gridspec is created from a

# subplotspec. (GridSpecFromSubplotSpec)

_AllowedKeys = ["left", "bottom", "right", "top", "wspace", "hspace"]

def __getstate__(self):

state = self.__dict__

try:

state.pop('_layoutbox')

except KeyError:

pass

return state

def __setstate__(self, state):

self.__dict__ = state

# layoutboxes don't survive pickling...

self._layoutbox = None

<div class="viewcode-block" id="GridSpec.update"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpec.html#matplotlib.gridspec.GridSpec.update">[docs]</a> def update(self, **kwargs):

"""

Update the current values.

Values set to None use the rcParams value.

"""

for k, v in kwargs.items():

if k in self._AllowedKeys:

setattr(self, k, v)

else:

raise AttributeError(f"{k} is an unknown keyword")

for figmanager in _pylab_helpers.Gcf.figs.values():

for ax in figmanager.canvas.figure.axes:

# copied from Figure.subplots_adjust

if not isinstance(ax, mpl.axes.SubplotBase):

# Check if sharing a subplots axis

if isinstance(ax._sharex, mpl.axes.SubplotBase):

if ax._sharex.get_subplotspec().get_gridspec() == self:

ax._sharex.update_params()

ax._set_position(ax._sharex.figbox)

elif isinstance(ax._sharey, mpl.axes.SubplotBase):

if ax._sharey.get_subplotspec().get_gridspec() == self:

ax._sharey.update_params()

ax._set_position(ax._sharey.figbox)

else:

ss = ax.get_subplotspec().get_topmost_subplotspec()

if ss.get_gridspec() == self:

ax.update_params()

<div class="viewcode-block" id="GridSpec.get_subplot_params"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpec.html#matplotlib.gridspec.GridSpec.get_subplot_params">[docs]</a> def get_subplot_params(self, figure=None):

"""

Return a dictionary of subplot layout parameters. The default

parameters are from rcParams unless a figure attribute is set.

"""

if figure is None:

kw = {k: rcParams["figure.subplot."+k] for k in self._AllowedKeys}

subplotpars = mpl.figure.SubplotParams(**kw)

else:

subplotpars = copy.copy(figure.subplotpars)

subplotpars.update(**{k: getattr(self, k) for k in self._AllowedKeys})

return subplotpars</div>

<div class="viewcode-block" id="GridSpec.locally_modified_subplot_params"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpec.html#matplotlib.gridspec.GridSpec.locally_modified_subplot_params">[docs]</a> def locally_modified_subplot_params(self):

return [k for k in self._AllowedKeys if getattr(self, k)]</div>

<div class="viewcode-block" id="GridSpec.tight_layout"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.gridspec.GridSpec.html#matplotlib.gridspec.GridSpec.tight_layout">[docs]</a> def tight_layout(self, figure, renderer=None,

pad=1.08, h_pad=None, w_pad=None, rect=None):

"""

Adjust subplot parameters to give specified padding.

Parameters

----------

pad : float

Padding between the figure edge and the edges of subplots, as a

fraction of the font-size.

h_pad, w_pad : float, optional

Padding (height/width) between edges of adjacent subplots.

Defaults to *pad*.

rect : tuple of 4 floats, optional

(left, bottom, right, top) rectangle in normalized figure

coordinates that the whole subplots area (including labels) will

fit into. Default is (0, 0, 1, 1).

"""

subplotspec_list = tight_layout.get_subplotspec_list(

figure.axes, grid_spec=self)

if None in subplotspec_list:

cbook._warn_external("This figure includes Axes that are not "

"compatible with tight_layout, so results "

"might be incorrect.")

if renderer is None:

renderer = tight_layout.get_renderer(figure)

kwargs = tight_layout.get_tight_layout_figure(

figure, figure.axes, subplotspec_list, renderer,

pad=pad, h_pad=h_pad, w_pad=w_pad, rect=rect)

if kwargs:

self.update(**kwargs)</div></div>

class GridSpecFromSubplotSpec(GridSpecBase):

"""

GridSpec whose subplot layout parameters are inherited from the

location specified by a given SubplotSpec.

"""

subplot_spec,

height_ratios=None, width_ratios=None):

"""

The number of rows and number of columns of the grid need to

be set. An instance of SubplotSpec is also needed to be set

from which the layout parameters will be inherited. The wspace

and hspace of the layout can be optionally specified or the

default values (from the figure or rcParams) will be used.

"""

self._wspace = wspace

self._hspace = hspace

self._subplot_spec = subplot_spec

width_ratios=width_ratios,

height_ratios=height_ratios)

# do the layoutboxes

subspeclb = subplot_spec._layoutbox

if subspeclb is None:

self._layoutbox = None

else:

# OK, this is needed to divide the figure.

self._layoutbox = subspeclb.layout_from_subplotspec(

subplot_spec,

name=subspeclb.name + '.gridspec' + layoutbox.seq_id(),

artist=self)

def get_subplot_params(self, figure=None):

"""Return a dictionary of subplot layout parameters.

"""

hspace = (self._hspace if self._hspace is not None

else figure.subplotpars.hspace if figure is not None

else rcParams["figure.subplot.hspace"])

wspace = (self._wspace if self._wspace is not None

else figure.subplotpars.wspace if figure is not None

else rcParams["figure.subplot.wspace"])

figbox = self._subplot_spec.get_position(figure)

left, bottom, right, top = figbox.extents

return mpl.figure.SubplotParams(left=left, right=right,

bottom=bottom, top=top,

wspace=wspace, hspace=hspace)

def get_topmost_subplotspec(self):

"""

Return the topmost `.SubplotSpec` instance associated with the subplot.

"""

return self._subplot_spec.get_topmost_subplotspec()

class SubplotSpec:

"""

Specifies the location of a subplot in a `GridSpec`.

.. note::

Likely, you'll never instantiate a `SubplotSpec` yourself. Instead you

will typically obtain one from a `GridSpec` using item-access.

Parameters

----------

gridspec : `~matplotlib.gridspec.GridSpec`

The GridSpec, which the subplot is referencing.

num1, num2 : int

The subplot will occupy the num1-th cell of the given

gridspec. If num2 is provided, the subplot will span between

num1-th cell and num2-th cell.

The index starts from 0.

"""

def __init__(self, gridspec, num1, num2=None):

self._gridspec = gridspec

self.num1 = num1

self.num2 = num2

if gridspec._layoutbox is not None:

glb = gridspec._layoutbox

# So note that here we don't assign any layout yet,

# just make the layoutbox that will contain all items

# associated w/ this axis. This can include other axes like

# a colorbar or a legend.

parent=glb,

name=glb.name + '.ss' + layoutbox.seq_id(),

artist=self)

else:

self._layoutbox = None

def __getstate__(self):

state = self.__dict__

try:

state.pop('_layoutbox')

except KeyError:

pass

return state

def __setstate__(self, state):

self.__dict__ = state

# layoutboxes don't survive pickling...

self._layoutbox = None

def get_gridspec(self):

return self._gridspec

def get_geometry(self):

"""

Return the subplot geometry as tuple ``(n_rows, n_cols, start, stop)``.

The indices *start* and *stop* define the range of the subplot within

the `GridSpec`. *stop* is inclusive (i.e. for a single cell

``start == stop``).

"""

rows, cols = self.get_gridspec().get_geometry()

return rows, cols, self.num1, self.num2

def get_rows_columns(self):

"""

Return the subplot row and column numbers as a tuple

``(n_rows, n_cols, row_start, row_stop, col_start, col_stop)``.

"""

gridspec = self.get_gridspec()

nrows, ncols = gridspec.get_geometry()

row_start, col_start = divmod(self.num1, ncols)

if self.num2 is not None:

row_stop, col_stop = divmod(self.num2, ncols)

else:

row_stop = row_start

col_stop = col_start

return nrows, ncols, row_start, row_stop, col_start, col_stop

def get_position(self, figure, return_all=False):

"""

Update the subplot position from ``figure.subplotpars``.

"""

gridspec = self.get_gridspec()

rows, cols = np.unravel_index(

[self.num1] if self.num2 is None else [self.num1, self.num2],

(nrows, ncols))

fig_bottoms, fig_tops, fig_lefts, fig_rights = \

gridspec.get_grid_positions(figure)

fig_bottom = fig_bottoms[rows].min()

fig_top = fig_tops[rows].max()

fig_left = fig_lefts[cols].min()

fig_right = fig_rights[cols].max()

figbox = Bbox.from_extents(fig_left, fig_bottom, fig_right, fig_top)

if return_all:

return figbox, rows[0], cols[0], nrows, ncols

else:

return figbox

def get_topmost_subplotspec(self):

"""

Return the topmost `SubplotSpec` instance associated with the subplot.

"""

gridspec = self.get_gridspec()

if hasattr(gridspec, "get_topmost_subplotspec"):

return gridspec.get_topmost_subplotspec()

else:

return self

def __eq__(self, other):

"""

Two SubplotSpecs are considered equal if they refer to the same

position(s) in the same `GridSpec`.

"""

# other may not even have the attributes we are checking.

return ((self._gridspec, self.num1, self.num2)

== (getattr(other, "_gridspec", object()),

getattr(other, "num1", object()),

getattr(other, "num2", object())))

def __hash__(self):

return hash((self._gridspec, self.num1, self.num2))

def subgridspec(self, nrows, ncols, **kwargs):

"""

Create a GridSpec within this subplot.

The created `.GridSpecFromSubplotSpec` will have this `SubplotSpec` as

a parent.

Parameters

----------

nrows : int

Number of rows in grid.

ncols : int

Number or columns in grid.

Returns

-------

gridspec : `.GridSpecFromSubplotSpec`

Other Parameters

----------------

**kwargs

All other parameters are passed to `.GridSpecFromSubplotSpec`.

See Also

--------

matplotlib.pyplot.subplots

Examples

--------

Adding three subplots in the space occupied by a single subplot::

fig = plt.figure()

gs0 = fig.add_gridspec(3, 1)

ax1 = fig.add_subplot(gs0[0])

ax2 = fig.add_subplot(gs0[1])

gssub = gs0[2].subgridspec(1, 3)

for i in range(3):

fig.add_subplot(gssub[0, i])

"""

return GridSpecFromSubplotSpec(nrows, ncols, self, **kwargs)

</pre></div>

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Last updated on Oct 28, 2019.

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