.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/images_contours_and_fields/barb_demo.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. meta::
        :keywords: codex

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_gallery_images_contours_and_fields_barb_demo.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_images_contours_and_fields_barb_demo.py:


==========
Wind Barbs
==========

Demonstration of wind barb plots.

.. GENERATED FROM PYTHON SOURCE LINES 8-50

.. code-block:: Python

    import matplotlib.pyplot as plt
    import numpy as np

    x = np.linspace(-5, 5, 5)
    X, Y = np.meshgrid(x, x)
    U, V = 12 * X, 12 * Y

    data = [(-1.5, .5, -6, -6),
            (1, -1, -46, 46),
            (-3, -1, 11, -11),
            (1, 1.5, 80, 80),
            (0.5, 0.25, 25, 15),
            (-1.5, -0.5, -5, 40)]

    data = np.array(data, dtype=[('x', np.float32), ('y', np.float32),
                                 ('u', np.float32), ('v', np.float32)])

    fig1, axs1 = plt.subplots(nrows=2, ncols=2)
    # Default parameters, uniform grid
    axs1[0, 0].barbs(X, Y, U, V)

    # Arbitrary set of vectors, make them longer and change the pivot point
    # (point around which they're rotated) to be the middle
    axs1[0, 1].barbs(
        data['x'], data['y'], data['u'], data['v'], length=8, pivot='middle')

    # Showing colormapping with uniform grid.  Fill the circle for an empty barb,
    # don't round the values, and change some of the size parameters
    axs1[1, 0].barbs(
        X, Y, U, V, np.sqrt(U ** 2 + V ** 2), fill_empty=True, rounding=False,
        sizes=dict(emptybarb=0.25, spacing=0.2, height=0.3))

    # Change colors as well as the increments for parts of the barbs
    axs1[1, 1].barbs(data['x'], data['y'], data['u'], data['v'], flagcolor='r',
                     barbcolor=['b', 'g'], flip_barb=True,
                     barb_increments=dict(half=10, full=20, flag=100))

    # Masked arrays are also supported
    masked_u = np.ma.masked_array(data['u'])
    masked_u[4] = 1000  # Bad value that should not be plotted when masked
    masked_u[4] = np.ma.masked




.. image-sg:: /gallery/images_contours_and_fields/images/sphx_glr_barb_demo_001.png
   :alt: barb demo
   :srcset: /gallery/images_contours_and_fields/images/sphx_glr_barb_demo_001.png, /gallery/images_contours_and_fields/images/sphx_glr_barb_demo_001_2_00x.png 2.00x
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 51-53

Identical plot to panel 2 in the first figure, but with the point at
(0.5, 0.25) missing (masked)

.. GENERATED FROM PYTHON SOURCE LINES 53-58

.. code-block:: Python

    fig2, ax2 = plt.subplots()
    ax2.barbs(data['x'], data['y'], masked_u, data['v'], length=8, pivot='middle')

    plt.show()




.. image-sg:: /gallery/images_contours_and_fields/images/sphx_glr_barb_demo_002.png
   :alt: barb demo
   :srcset: /gallery/images_contours_and_fields/images/sphx_glr_barb_demo_002.png, /gallery/images_contours_and_fields/images/sphx_glr_barb_demo_002_2_00x.png 2.00x
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 59-65

.. admonition:: References

   The use of the following functions, methods, classes and modules is shown
   in this example:

   - `matplotlib.axes.Axes.barbs` / `matplotlib.pyplot.barbs`


.. _sphx_glr_download_gallery_images_contours_and_fields_barb_demo.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: barb_demo.ipynb <barb_demo.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: barb_demo.py <barb_demo.py>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_