.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "11_demos\python_packages\matplotlib\demo_log.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

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

        :ref:`Go to the end <sphx_glr_download_11_demos_python_packages_matplotlib_demo_log.py>`
        to download the full example code.

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

.. _sphx_glr_11_demos_python_packages_matplotlib_demo_log.py:

Logarithmus
==============

.. GENERATED FROM PYTHON SOURCE LINES 5-55



.. image-sg:: /11_demos/python_packages/matplotlib/images/sphx_glr_demo_log_001.png
   :alt: semilogy, semilogx, loglog base 4 on x, Errorbars go negative
   :srcset: /11_demos/python_packages/matplotlib/images/sphx_glr_demo_log_001.png
   :class: sphx-glr-single-img





.. code-block:: Python


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

    plt.figure()

    plt.subplots_adjust(hspace=0.4)
    t = np.arange(0.01, 20.0, 0.01)

    # log y axis
    plt.subplot(221)
    plt.semilogy(t, np.exp(-t / 5.0))
    plt.title("semilogy")
    plt.grid(True)

    # log x axis
    plt.subplot(222)
    plt.semilogx(t, np.sin(2 * np.pi * t))
    plt.title("semilogx")
    plt.grid(True)

    # log x and y axis
    plt.subplot(223)

    if matplotlib.__version__ < "3.3.0":
        plt.loglog(t, 20 * np.exp(-t / 10.0), basex=2)
    else:
        plt.loglog(t, 20 * np.exp(-t / 10.0), base=2)
    plt.grid(True)
    plt.title("loglog base 4 on x")

    # with errorbars: clip non-positive values
    ax = plt.subplot(224)

    if matplotlib.__version__ < "3.3.0":
        ax.set_xscale("log", nonposx="clip")
        ax.set_yscale("log", nonposy="clip")
    else:
        ax.set_xscale("log", nonpositive="clip")
        ax.set_yscale("log", nonpositive="clip")

    x = 10.0 ** np.linspace(0.0, 2.0, 20)
    y = x**2.0
    plt.errorbar(x, y, xerr=0.1 * x, yerr=5.0 + 0.75 * y)
    ax.set_ylim(ymin=0.1)
    ax.set_title("Errorbars go negative")


    plt.show()


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

   **Total running time of the script:** (0 minutes 0.250 seconds)


.. _sphx_glr_download_11_demos_python_packages_matplotlib_demo_log.py:

.. only:: html

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

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

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

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

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

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

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