.. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_images_contours_and_fields_barb_demo.py: ========= Barb Demo ========= Demonstration of wind barb plots .. code-block:: default 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 # Identical plot to panel 2 in the first figure, but with the point at # (0.5, 0.25) missing (masked) fig2, ax2 = plt.subplots() ax2.barbs(data['x'], data['y'], masked_u, data['v'], length=8, pivot='middle') plt.show() .. rst-class:: sphx-glr-horizontal * .. image:: /gallery/images_contours_and_fields/images/sphx_glr_barb_demo_001.png :class: sphx-glr-multi-img * .. image:: /gallery/images_contours_and_fields/images/sphx_glr_barb_demo_002.png :class: sphx-glr-multi-img ------------ References """""""""" The use of the following functions, methods and classes is shown in this example: .. code-block:: default import matplotlib matplotlib.axes.Axes.barbs matplotlib.pyplot.barbs .. rst-class:: sphx-glr-script-out Out: .. code-block:: none .. _sphx_glr_download_gallery_images_contours_and_fields_barb_demo.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download :download:`Download Python source code: barb_demo.py ` .. container:: sphx-glr-download :download:`Download Jupyter notebook: barb_demo.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_