.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/XY/NCL_xy_7_2.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

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

        :ref:`Go to the end <sphx_glr_download_gallery_XY_NCL_xy_7_2.py>`
        to download the full example code.

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

.. _sphx_glr_gallery_XY_NCL_xy_7_2.py:


NCL_xy_7_2.py
===============
An example of a double y plot: two separate line with their own unique axis.

This script illustrates the following concepts:
   - Drawing an XY plot with two different Y axes
   - Changing the title on the Y axis
   - Changing the line dash pattern in an XY plot
   - Changing the line color for multiple curves in an XY plot
   - Setting the minimum/maximum value of the Y axis in an XY plot

See following URLs to see the reproduced NCL plot & script:
    - Original NCL script: https://www.ncl.ucar.edu/Applications/Scripts/xy_7.ncl
    - Original NCL plot: https://www.ncl.ucar.edu/Applications/Images/xy_7_2_lg.png

.. GENERATED FROM PYTHON SOURCE LINES 19-20

Import packages:

.. GENERATED FROM PYTHON SOURCE LINES 20-28

.. code-block:: Python


    import matplotlib.pyplot as plt
    import numpy as np
    import xarray as xr

    import geocat.datafiles as gdf
    import geocat.viz as gv








.. GENERATED FROM PYTHON SOURCE LINES 29-30

Read in data:

.. GENERATED FROM PYTHON SOURCE LINES 30-36

.. code-block:: Python


    # Open a netCDF data file using xarray default engine and load the data into xarrays
    ds = xr.open_dataset(gdf.get("netcdf_files/TestData.xy3.nc"))
    # Extract a slice of the data
    ds = ds.isel(case=0, time=slice(0, 36))








.. GENERATED FROM PYTHON SOURCE LINES 37-38

Plot:

.. GENERATED FROM PYTHON SOURCE LINES 38-83

.. code-block:: Python


    # Generate figure (set its size (width, height) in inches) and axes (with two different y-axes)
    fig, ax1 = plt.subplots(figsize=(7, 6.5))

    # Plot data
    ax1.plot(ds.time, ds.T, color="blue", linestyle="-", linewidth=0.9)

    # Usa geocat.viz.util convenience function to add minor and major tick lines
    gv.add_major_minor_ticks(ax1, x_minor_per_major=5, labelsize=14)

    # Usa geocat.viz.util convenience function to set axes parameters without calling several matplotlib functions
    # Set axes limits, and tick values
    gv.set_axes_limits_and_ticks(
        ax1, xlim=(1970, 1973), ylim=(0.0, 16.0), yticks=np.arange(0, 17, 3)
    )

    # Usa geocat.viz.util convenience function to set titles and labels without calling several matplotlib functions
    gv.set_titles_and_labels(
        ax1,
        maintitle="Curves Offset",
        xlabel=ds.time.long_name,
        ylabel=f"{ds.T.long_name} [solid]",
    )

    # Create second y-axis
    ax2 = ax1.twinx()

    # Use geocat.viz.util convenience function to add minor and major tick lines
    gv.add_major_minor_ticks(ax2, x_minor_per_major=5, labelsize=14)

    # Line-plot data
    ax2.plot(ds.time, ds.P, color="red", linestyle="--", dashes=[6.5, 3.7], linewidth=0.9)

    # Use geocat.viz.util convenience function to set axes parameters without calling several matplotlib functions
    # Set axes limits, and tick values
    gv.set_axes_limits_and_ticks(
        ax2, ylim=(1008.0, 1024.0), yticks=np.arange(1008, 1025, 3)
    )

    # Set second y-axis label
    ax2.set_ylabel(f"{ds.P.long_name} [dash]", fontsize=16)

    # Show the plot
    plt.tight_layout()
    plt.show()



.. image-sg:: /gallery/XY/images/sphx_glr_NCL_xy_7_2_001.png
   :alt: Curves Offset
   :srcset: /gallery/XY/images/sphx_glr_NCL_xy_7_2_001.png
   :class: sphx-glr-single-img






.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.395 seconds)


.. _sphx_glr_download_gallery_XY_NCL_xy_7_2.py:

.. only:: html

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

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

      :download:`Download Jupyter notebook: NCL_xy_7_2.ipynb <NCL_xy_7_2.ipynb>`

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

      :download:`Download Python source code: NCL_xy_7_2.py <NCL_xy_7_2.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: NCL_xy_7_2.zip <NCL_xy_7_2.zip>`


.. only:: html

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

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