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Merge pull request matplotlib#2522 from toddrjen/spectrum
Add additional spectrum-related plots and improve underlying structure
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‎CHANGELOG

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2013-10-06 Add stride-based functions to mlab for easy creation of 2D arrays
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with less memory.
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2013-10-06 Improve window and detrend functions in mlab, particulart support for
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2D arrays.
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2013-10-06 Improve performance of all spectrum-related mlab functions and plots.
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2013-10-06 Added support for magnitude, phase, and angle spectrums to
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axes.specgram, and support for magnitude, phase, angle, and complex
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spectrums to mlab-specgram.
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2013-10-06 Added magnitude_spectrum, angle_spectrum, and phase_spectrum plots,
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as well as magnitude_spectrum, angle_spectrum, phase_spectrum,
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and complex_spectrum functions to mlab
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2013-07-12 Added support for datetime axes to 2d plots. Axis values are passed
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through Axes.convert_xunits/Axes.convert_yunits before being used by
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contour/contourf, pcolormesh and pcolor.

‎boilerplate.py

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# name.
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_plotcommands = (
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'acorr',
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'angle_spectrum',
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'arrow',
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'axhline',
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'axhspan',
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'hlines',
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'imshow',
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'loglog',
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'magnitude_spectrum',
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'pcolor',
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'pcolormesh',
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'phase_spectrum',
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'pie',
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'plot',
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'plot_date',

‎doc/api/api_changes.rst

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- `xycoords` -> set the units of the point location
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- `set_position()` -> `Annotation` only set location of annotation
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* NFFT being even is now enforced in `matplotlib.mlab.specgram`,
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`matplotlib.mlab.psd`, `matplotlib.mlab.csd`,
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`matplotlib.mlab.cohere`, `matplotlib.mlab.cohere_pairs`,
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`matplotlib.pyplot.specgram`, `matplotlib.pyplot.psd`,
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`matplotlib.pyplot.csd`, and `matplotlib.pyplot.cohere`. This was
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listed as a requirement but was not actually checked.
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* `matplotlib.mlab.specgram`, `matplotlib.mlab.psd`, `matplotlib.mlab.csd`,
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`matplotlib.mlab.cohere`, `matplotlib.mlab.cohere_pairs`,
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`matplotlib.pyplot.specgram`, `matplotlib.pyplot.psd`,
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`matplotlib.pyplot.csd`, and `matplotlib.pyplot.cohere` now raise
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ValueError where they previously raised AssertionError.
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* For `matplotlib.mlab.psd`, `matplotlib.mlab.csd`,
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`matplotlib.mlab.cohere`, `matplotlib.mlab.cohere_pairs`,
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`matplotlib.pyplot.specgram`, `matplotlib.pyplot.psd`,
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`matplotlib.pyplot.csd`, and `matplotlib.pyplot.cohere`, in cases
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where a shape (n, 1) array is returned, this is now converted to a (n, )
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array. Previously, (n, m) arrays were averaged to an (n, ) array, but
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(n, 1) arrays were returend unchanged. This change makes the dimensions
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consistent in both cases.
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.. _changes_in_1_3:
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‎doc/users/whats_new.rst

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:func:`~matplotlib.pyplot.contour`, :func:`~matplotlib.pyplot.contourf`,
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:func:`~matplotlib.pyplot.pcolormesh` and :func:`~matplotlib.pyplot.pcolor`.
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Support for additional spectrum types
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`````````````````````````````````````
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Todd Jennings added support for new types of frequency spectrum plots:
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:func:`~matplotlib.pyplot.magnitude_spectrum`,
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:func:`~matplotlib.pyplot.phase_spectrum`, and
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:func:`~matplotlib.pyplot.angle_spectrum`, as well as corresponding functions
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in mlab.
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He also added these spectrum types to :func:`~matplotlib.pyplot.specgram`,
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as well as adding support for linear scaling there (in addition to the
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existing dB scaling). Support for additional spectrum types was also added to
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:func:`~matplotlib.mlab.specgram`.
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He also increased the performance for all of these functions and plot types.
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Support for detrending and windowing 2D arrays in mlab
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``````````````````````````````````````````````````````
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Todd Jennings added support for 2D arrays in the
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:func:`~matplotlib.mlab.detrend_mean`, :func:`~matplotlib.mlab.detrend_none`,
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and :func:`~matplotlib.mlab.detrend`, as well as adding
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:func:`~matplotlib.mlab.apply_window` which support windowing 2D arrays.
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Support for strides in mlab
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```````````````````````````
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Todd Jennings added some functions to mlab to make it easier to use numpy
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strides to create memory-efficient 2D arrays. This includes
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:func:`~matplotlib.mlab.stride_repeat`, which repeats an array to create a 2D
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array, and :func:`~matplotlib.mlab.stride_windows`, which uses a moving window
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to create a 2D array from a 1D array.
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Date handling
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-------------

‎examples/pylab_examples/spectrum_demo.py

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#!/usr/bin/env python
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# python
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from pylab import *
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dt = 0.01
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Fs = 1/dt
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t = arange(0, 10, dt)
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nse = randn(len(t))
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r = exp(-t/0.05)
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cnse = convolve(nse, r)*dt
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cnse = cnse[:len(t)]
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s = 0.1*sin(2*pi*t) + cnse
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subplot(3, 2, 1)
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plot(t, s)
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subplot(3, 2, 3)
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magnitude_spectrum(s, Fs=Fs)
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subplot(3, 2, 4)
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magnitude_spectrum(s, Fs=Fs, scale='dB')
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subplot(3, 2, 5)
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angle_spectrum(s, Fs=Fs)
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subplot(3, 2, 6)
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phase_spectrum(s, Fs=Fs)
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show()

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