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

.. only:: html

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

        Click :ref:`here <sphx_glr_download_gallery_plot_speed_of_sound.py>`
        to download the full example code or to run this example in your browser via Binder

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

.. _sphx_glr_gallery_plot_speed_of_sound.py:


Speed of Sound
==============

This example shows how to compute the speed of sound by fitting phonon frequencies
along selected directions by linear least-squares fit.
For a command line interface use:

    abiview.py ddb_vs input_DDB

.. GENERATED FROM PYTHON SOURCE LINES 12-31



.. image:: /gallery/images/sphx_glr_plot_speed_of_sound_001.png
    :alt: [0.707, 0.000, 0.707] - X, [0.408, 0.408, 0.816] - K, [0.577, 0.577, 0.577] - L
    :class: sphx-glr-single-img



.. raw:: html

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    </div>
    <br />
    <br />

.. code-block:: default

    from __future__ import print_function

    import os
    import abipy.data as abidata

    from abipy import abilab
    from abipy.dfpt.vsound import SoundVelocity

    # Initialize object from DDB file.
    ddb_path = os.path.join(abidata.dirpath, "refs", "si_sound_vel", "Si_DDB")
    sv = SoundVelocity.from_ddb(ddb_path)

    # Get pandas dataframe with results.
    df = sv.get_dataframe()
    abilab.print_dataframe(df)

    # Plot fit
    sv.plot()
    sv.plotly()


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

   **Total running time of the script:** ( 0 minutes  1.555 seconds)


.. _sphx_glr_download_gallery_plot_speed_of_sound.py:


.. only :: html

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


  .. container:: binder-badge

    .. image:: images/binder_badge_logo.svg
      :target: https://mybinder.org/v2/gh/abinit/abipy/gh-pages?filepath=notebooks/gallery/plot_speed_of_sound.ipynb
      :alt: Launch binder
      :width: 150 px


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

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



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

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


.. only:: html

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

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