Add additional spectrum-related plots and improve underlying structure#2522

Merged

mdboom merged 9 commits intomatplotlib:masterfrom

toddrjen:spectrum

Oct 24, 2013

Commits on Oct 22, 2013

add more spectrum functions and add new spectrum types to specgram in mlab.py, and clean up window and detrend functions in mlab.py
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add mlab tests for new spectrum types, window and detrend functions, and greatly expand existing tests
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add CleanupTestCase, a unittest.TestCase with cleanup
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refactor mlab spectrum, window, and detrend functions to improve modularity, testability, and performance
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implement tests for refactored mlab spectrum, windowing, and detrend functions, with 100% coverage
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add more spectral plots and add new spectrum types to specgram in _axes
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add tests for new spectrum types in _axes
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add demo for new spectral plot types
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added information regarding new spectrum functions to CHANGELOG, whats_new, and api_changes
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