.. _sphx_glr_examples_plot_bar_with_net_lines.py:


============================================
Plot Data as a Bar Plot with Net Value Lines
============================================




.. code-block:: python

    # sphinx_gallery_thumbnail_number = 2
    import matplotlib.pyplot as plt
    import pyam

    from pyam.plotting import add_net_values_to_bar_plot







Read in some example data



.. code-block:: python


    fname = 'data.csv'
    df = pyam.IamDataFrame(fname, encoding='ISO-8859-1')
    print(df.head())





.. rst-class:: sphx-glr-script-out

 Out::

    model scenario  region       variable       unit  year      value
    9   MESSAGE-GLOBIOM  SSP2-26  R5ASIA  Emissions|CO2  Mt CO2/yr  2005  10488.011
    15  MESSAGE-GLOBIOM  SSP2-26   R5LAM  Emissions|CO2  Mt CO2/yr  2005   5086.483
    12  MESSAGE-GLOBIOM  SSP2-26   R5MAF  Emissions|CO2  Mt CO2/yr  2005   4474.073
    3   MESSAGE-GLOBIOM  SSP2-26  R5OECD  Emissions|CO2  Mt CO2/yr  2005  14486.522
    6   MESSAGE-GLOBIOM  SSP2-26   R5REF  Emissions|CO2  Mt CO2/yr  2005   2742.073


We generated a simple stacked bar chart as below



.. code-block:: python


    data = df.filter({'variable': 'Emissions|CO2|*',
                      'level': 0,
                      'region': 'World',
                      'year': [2040, 2050, 2060]})

    fig, ax = plt.subplots(figsize=(6, 6))
    data.bar_plot(ax=ax, stacked=True)
    fig.subplots_adjust(right=0.55)
    plt.show()




.. image:: /examples/images/sphx_glr_plot_bar_with_net_lines_001.png
    :align: center




Sometimes stacked bar charts have negative entries - in that case it helps to
add a line showing the net value.



.. code-block:: python


    data = df.filter({'variable': 'Emissions|CO2|*',
                      'level': 0,
                      'region': 'World',
                      'year': [2040, 2050, 2060]})

    fig, ax = plt.subplots(figsize=(6, 6))
    data.bar_plot(ax=ax, stacked=True)
    add_net_values_to_bar_plot(ax, color='k')
    fig.subplots_adjust(right=0.55)
    plt.show()



.. image:: /examples/images/sphx_glr_plot_bar_with_net_lines_002.png
    :align: center




**Total running time of the script:** ( 0 minutes  0.203 seconds)



.. only :: html

 .. container:: sphx-glr-footer


  .. container:: sphx-glr-download

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



  .. container:: sphx-glr-download

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


.. only:: html

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

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