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

.. only:: html

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

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

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

.. _sphx_glr_auto_examples_ppm_example.py:


ppm Example
===========

Demonstrates how to convert from offset in Hz to 
ppm scale

.. GENERATED FROM PYTHON SOURCE LINES 8-56



.. rst-class:: sphx-glr-horizontal


    *

      .. image-sg:: /auto_examples/images/sphx_glr_ppm_example_001.png
         :alt: full spectrum, Hz
         :srcset: /auto_examples/images/sphx_glr_ppm_example_001.png, /auto_examples/images/sphx_glr_ppm_example_001_2_00x.png 2.00x
         :class: sphx-glr-multi-img

    *

      .. image-sg:: /auto_examples/images/sphx_glr_ppm_example_002.png
         :alt: full spectrum, ppm
         :srcset: /auto_examples/images/sphx_glr_ppm_example_002.png, /auto_examples/images/sphx_glr_ppm_example_002_2_00x.png 2.00x
         :class: sphx-glr-multi-img

    *

      .. image-sg:: /auto_examples/images/sphx_glr_ppm_example_003.png
         :alt: sliced spectrum, Hz
         :srcset: /auto_examples/images/sphx_glr_ppm_example_003.png, /auto_examples/images/sphx_glr_ppm_example_003_2_00x.png 2.00x
         :class: sphx-glr-multi-img

    *

      .. image-sg:: /auto_examples/images/sphx_glr_ppm_example_004.png
         :alt: sliced spectrum, ppm
         :srcset: /auto_examples/images/sphx_glr_ppm_example_004.png, /auto_examples/images/sphx_glr_ppm_example_004_2_00x.png 2.00x
         :class: sphx-glr-multi-img


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

 .. code-block:: none

    1: full spectrum, Hz |||Hz
    2: full spectrum, ppm |||ppm
    3: sliced spectrum, Hz |||Hz
    4: sliced spectrum, ppm |||ppm







|

.. code-block:: Python

    from pylab import *
    from pyspecdata import *
    #pull parameters from RM1_sept30_1H_211001 expno 1

    # make peaks on a frequency axis
    x = nddata(r_[0:6.8157439:32768j], "t2")
    x.set_units("t2", "s")

    # generate time-domain signal
    SW_h = 1./(x.getaxis('t2')[1] - x.getaxis('t2')[0])
    signal = 0 * x  # create an array of zeros that's the right shape
    SFO1 = 400.1307334
    BF1 = 400.13
    SF = 400.1301846
    TMS_shift = (SF-SFO1)*1e6
    for A, nu, R in [
        (0.3, TMS_shift, 0.04),
        (1, 25, 0.08),
        (1, 50, 1.2),
        (1, 20, 0.45),
        (1, 750, 1.2),
        (1, 10, 0.08),
    ]:
        #nu = SFO1 + nu # it's really unclear why this is done!
        signal += A * exp(1j * 2 * pi * nu * x - x / R)
    signal.set_units("t2", "s")
    signal.ft("t2", shift=True)

    OFFSET = (SFO1/SF-1) * 1.0e6 + 0.5 * SW_h * SFO1/SF
    signal.set_prop('acq',{'SFO1':SFO1,'SW_h':SW_h})
    signal.set_prop('proc',{'SF':SF,
        'OFFSET':OFFSET})

    # Copy of signal to demonstrate truncation
    signal_sliced = signal.C

    with figlist_var() as fl:
        fl.next("full spectrum, Hz")
        fl.plot(signal)
        signal.to_ppm()
        fl.next("full spectrum, ppm")
        fl.plot(signal)
        signal_sliced = signal_sliced["t2":(0.2e3, 1.4e3)]
        fl.next("sliced spectrum, Hz")
        fl.plot(signal_sliced)
        signal_sliced.to_ppm()
        fl.next("sliced spectrum, ppm")
        fl.plot(signal_sliced)


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

   **Total running time of the script:** (0 minutes 1.402 seconds)


.. _sphx_glr_download_auto_examples_ppm_example.py:

.. only:: html

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

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

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

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

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


.. only:: html

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

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