.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "tutorials/intermediate/gridspec.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_tutorials_intermediate_gridspec.py: ============================================================= Customizing Figure Layouts Using GridSpec and Other Functions ============================================================= How to create grid-shaped combinations of axes. :func:`~matplotlib.pyplot.subplots` Perhaps the primary function used to create figures and axes. It's also similar to :func:`.matplotlib.pyplot.subplot`, but creates and places all axes on the figure at once. See also `matplotlib.figure.Figure.subplots`. :class:`~matplotlib.gridspec.GridSpec` Specifies the geometry of the grid that a subplot will be placed. 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. :class:`~matplotlib.gridspec.SubplotSpec` Specifies the location of the subplot in the given *GridSpec*. :func:`~matplotlib.pyplot.subplot2grid` A helper function that is similar to :func:`~matplotlib.pyplot.subplot`, but uses 0-based indexing and let subplot to occupy multiple cells. This function is not covered in this tutorial. .. GENERATED FROM PYTHON SOURCE LINES 30-34 .. code-block:: default import matplotlib.pyplot as plt import matplotlib.gridspec as gridspec .. GENERATED FROM PYTHON SOURCE LINES 35-44 Basic Quickstart Guide ====================== These first two examples show how to create a basic 2-by-2 grid using both :func:`~matplotlib.pyplot.subplots` and :mod:`~matplotlib.gridspec`. Using :func:`~matplotlib.pyplot.subplots` is quite simple. It returns a :class:`~matplotlib.figure.Figure` instance and an array of :class:`~matplotlib.axes.Axes` objects. .. GENERATED FROM PYTHON SOURCE LINES 44-47 .. code-block:: default fig1, f1_axes = plt.subplots(ncols=2, nrows=2, constrained_layout=True) .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_001.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 48-56 For a simple use case such as this, :mod:`~matplotlib.gridspec` is perhaps overly verbose. You have to create the figure and :class:`~matplotlib.gridspec.GridSpec` instance separately, then pass elements of gridspec instance to the :func:`~matplotlib.figure.Figure.add_subplot` method to create the axes objects. The elements of the gridspec are accessed in generally the same manner as numpy arrays. .. GENERATED FROM PYTHON SOURCE LINES 56-64 .. code-block:: default fig2 = plt.figure(constrained_layout=True) spec2 = gridspec.GridSpec(ncols=2, nrows=2, figure=fig2) f2_ax1 = fig2.add_subplot(spec2[0, 0]) f2_ax2 = fig2.add_subplot(spec2[0, 1]) f2_ax3 = fig2.add_subplot(spec2[1, 0]) f2_ax4 = fig2.add_subplot(spec2[1, 1]) .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_002.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 65-73 The power of gridspec comes in being able to create subplots that span rows and columns. Note the `NumPy slice syntax `_ for selecting the part of the gridspec each subplot will occupy. Note that we have also used the convenience method `.Figure.add_gridspec` instead of `.gridspec.GridSpec`, potentially saving the user an import, and keeping the namespace cleaner. .. GENERATED FROM PYTHON SOURCE LINES 73-87 .. code-block:: default fig3 = plt.figure(constrained_layout=True) gs = fig3.add_gridspec(3, 3) f3_ax1 = fig3.add_subplot(gs[0, :]) f3_ax1.set_title('gs[0, :]') f3_ax2 = fig3.add_subplot(gs[1, :-1]) f3_ax2.set_title('gs[1, :-1]') f3_ax3 = fig3.add_subplot(gs[1:, -1]) f3_ax3.set_title('gs[1:, -1]') f3_ax4 = fig3.add_subplot(gs[-1, 0]) f3_ax4.set_title('gs[-1, 0]') f3_ax5 = fig3.add_subplot(gs[-1, -2]) f3_ax5.set_title('gs[-1, -2]') .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_003.png :alt: gs[0, :], gs[1, :-1], gs[1:, -1], gs[-1, 0], gs[-1, -2] :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out Out: .. code-block:: none Text(0.5, 1.0, 'gs[-1, -2]') .. GENERATED FROM PYTHON SOURCE LINES 88-95 :mod:`~matplotlib.gridspec` is also indispensable for creating subplots of different widths via a couple of methods. The method shown here is similar to the one above and initializes a uniform grid specification, and then uses numpy indexing and slices to allocate multiple "cells" for a given subplot. .. GENERATED FROM PYTHON SOURCE LINES 95-107 .. code-block:: default fig4 = plt.figure(constrained_layout=True) spec4 = fig4.add_gridspec(ncols=2, nrows=2) anno_opts = dict(xy=(0.5, 0.5), xycoords='axes fraction', va='center', ha='center') f4_ax1 = fig4.add_subplot(spec4[0, 0]) f4_ax1.annotate('GridSpec[0, 0]', **anno_opts) fig4.add_subplot(spec4[0, 1]).annotate('GridSpec[0, 1:]', **anno_opts) fig4.add_subplot(spec4[1, 0]).annotate('GridSpec[1:, 0]', **anno_opts) fig4.add_subplot(spec4[1, 1]).annotate('GridSpec[1:, 1:]', **anno_opts) .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_004.png :alt: gridspec :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out Out: .. code-block:: none Text(0.5, 0.5, 'GridSpec[1:, 1:]') .. GENERATED FROM PYTHON SOURCE LINES 108-115 Another option is to use the ``width_ratios`` and ``height_ratios`` parameters. These keyword arguments are lists of numbers. Note that absolute values are meaningless, only their relative ratios matter. That means that ``width_ratios=[2, 4, 8]`` is equivalent to ``width_ratios=[1, 2, 4]`` within equally wide figures. For the sake of demonstration, we'll blindly create the axes within ``for`` loops since we won't need them later. .. GENERATED FROM PYTHON SOURCE LINES 115-127 .. code-block:: default fig5 = plt.figure(constrained_layout=True) widths = [2, 3, 1.5] heights = [1, 3, 2] spec5 = fig5.add_gridspec(ncols=3, nrows=3, width_ratios=widths, height_ratios=heights) for row in range(3): for col in range(3): ax = fig5.add_subplot(spec5[row, col]) label = 'Width: {}\nHeight: {}'.format(widths[col], heights[row]) ax.annotate(label, (0.1, 0.5), xycoords='axes fraction', va='center') .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_005.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 128-136 Learning to use ``width_ratios`` and ``height_ratios`` is particularly useful since the top-level function :func:`~matplotlib.pyplot.subplots` accepts them within the ``gridspec_kw`` parameter. For that matter, any parameter accepted by :class:`~matplotlib.gridspec.GridSpec` can be passed to :func:`~matplotlib.pyplot.subplots` via the ``gridspec_kw`` parameter. This example recreates the previous figure without directly using a gridspec instance. .. GENERATED FROM PYTHON SOURCE LINES 136-145 .. code-block:: default gs_kw = dict(width_ratios=widths, height_ratios=heights) fig6, f6_axes = plt.subplots(ncols=3, nrows=3, constrained_layout=True, gridspec_kw=gs_kw) for r, row in enumerate(f6_axes): for c, ax in enumerate(row): label = 'Width: {}\nHeight: {}'.format(widths[c], heights[r]) ax.annotate(label, (0.1, 0.5), xycoords='axes fraction', va='center') .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_006.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 146-150 The ``subplots`` and ``get_gridspec`` methods can be combined since it is sometimes more convenient to make most of the subplots using ``subplots`` and then remove some and combine them. Here we create a layout with the bottom two axes in the last column combined. .. GENERATED FROM PYTHON SOURCE LINES 150-162 .. code-block:: default fig7, f7_axs = plt.subplots(ncols=3, nrows=3) gs = f7_axs[1, 2].get_gridspec() # remove the underlying axes for ax in f7_axs[1:, -1]: ax.remove() axbig = fig7.add_subplot(gs[1:, -1]) axbig.annotate('Big Axes \nGridSpec[1:, -1]', (0.1, 0.5), xycoords='axes fraction', va='center') fig7.tight_layout() .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_007.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 163-171 Fine Adjustments to a Gridspec Layout ===================================== When a GridSpec is explicitly used, you can adjust the layout parameters of subplots that are created from the GridSpec. Note this option is not compatible with ``constrained_layout`` or `.Figure.tight_layout` which both adjust subplot sizes to fill the figure. .. GENERATED FROM PYTHON SOURCE LINES 171-178 .. code-block:: default fig8 = plt.figure(constrained_layout=False) gs1 = fig8.add_gridspec(nrows=3, ncols=3, left=0.05, right=0.48, wspace=0.05) f8_ax1 = fig8.add_subplot(gs1[:-1, :]) f8_ax2 = fig8.add_subplot(gs1[-1, :-1]) f8_ax3 = fig8.add_subplot(gs1[-1, -1]) .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_008.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 179-183 This is similar to :func:`~matplotlib.pyplot.subplots_adjust`, but it only affects the subplots that are created from the given GridSpec. For example, compare the left and right sides of this figure: .. GENERATED FROM PYTHON SOURCE LINES 183-197 .. code-block:: default fig9 = plt.figure(constrained_layout=False) gs1 = fig9.add_gridspec(nrows=3, ncols=3, left=0.05, right=0.48, wspace=0.05) f9_ax1 = fig9.add_subplot(gs1[:-1, :]) f9_ax2 = fig9.add_subplot(gs1[-1, :-1]) f9_ax3 = fig9.add_subplot(gs1[-1, -1]) gs2 = fig9.add_gridspec(nrows=3, ncols=3, left=0.55, right=0.98, hspace=0.05) f9_ax4 = fig9.add_subplot(gs2[:, :-1]) f9_ax5 = fig9.add_subplot(gs2[:-1, -1]) f9_ax6 = fig9.add_subplot(gs2[-1, -1]) .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_009.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 198-207 GridSpec using SubplotSpec ========================== You can create GridSpec from the :class:`~matplotlib.gridspec.SubplotSpec`, in which case its layout parameters are set to that of the location of the given SubplotSpec. Note this is also available from the more verbose `.gridspec.GridSpecFromSubplotSpec`. .. GENERATED FROM PYTHON SOURCE LINES 207-219 .. code-block:: default fig10 = plt.figure(constrained_layout=True) gs0 = fig10.add_gridspec(1, 2) gs00 = gs0[0].subgridspec(2, 3) gs01 = gs0[1].subgridspec(3, 2) for a in range(2): for b in range(3): fig10.add_subplot(gs00[a, b]) fig10.add_subplot(gs01[b, a]) .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_010.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 220-226 A Complex Nested GridSpec using SubplotSpec =========================================== Here's a more sophisticated example of nested GridSpec where we put a box around each cell of the outer 4x4 grid, by hiding appropriate spines in each of the inner 3x3 grids. .. GENERATED FROM PYTHON SOURCE LINES 226-256 .. code-block:: default import numpy as np def squiggle_xy(a, b, c, d, i=np.arange(0.0, 2*np.pi, 0.05)): return np.sin(i*a)*np.cos(i*b), np.sin(i*c)*np.cos(i*d) fig11 = plt.figure(figsize=(8, 8), constrained_layout=False) outer_grid = fig11.add_gridspec(4, 4, wspace=0, hspace=0) for a in range(4): for b in range(4): # gridspec inside gridspec inner_grid = outer_grid[a, b].subgridspec(3, 3, wspace=0, hspace=0) axs = inner_grid.subplots() # Create all subplots for the inner grid. for (c, d), ax in np.ndenumerate(axs): ax.plot(*squiggle_xy(a + 1, b + 1, c + 1, d + 1)) ax.set(xticks=[], yticks=[]) # show only the outside spines for ax in fig11.get_axes(): ss = ax.get_subplotspec() ax.spines.top.set_visible(ss.is_first_row()) ax.spines.bottom.set_visible(ss.is_last_row()) ax.spines.left.set_visible(ss.is_first_col()) ax.spines.right.set_visible(ss.is_last_col()) plt.show() .. image:: /tutorials/intermediate/images/sphx_glr_gridspec_011.png :alt: gridspec :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 257-268 .. admonition:: References The use of the following functions, methods, classes and modules is shown in this example: - `matplotlib.pyplot.subplots` - `matplotlib.figure.Figure.add_gridspec` - `matplotlib.figure.Figure.add_subplot` - `matplotlib.gridspec.GridSpec` - `matplotlib.gridspec.SubplotSpec.subgridspec` - `matplotlib.gridspec.GridSpecFromSubplotSpec` .. rst-class:: sphx-glr-timing **Total running time of the script:** ( 0 minutes 8.524 seconds) .. _sphx_glr_download_tutorials_intermediate_gridspec.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: gridspec.py ` .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: gridspec.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_