Enh: SymNorm for normalizing symmetrical data around a center#17709

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jklymak merged 14 commits intomatplotlib:masterfrom

jpmattern:symnorm

Oct 22, 2020

Commits on Oct 2, 2020

Added SymNorm for normalizing symmetrical data around a center (0 by default).
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added suggested protection against changes to vmin
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now using halfrange, renamed SymNorm to CenteredNorm
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added comment
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bugfix and small improvements
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small set of tests for CenteredNorm
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added example code to tutorial
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added reference to CenteredNorm
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Commits on Oct 4, 2020

Update lib/matplotlib/colors.py
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QuLogic
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Update tutorials/colors/colormapnorms.py
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Commits on Oct 5, 2020

added whats new entry for CenteredNorm and expanded testing to setters
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Commits on Oct 12, 2020

cleaned CenteredNorm code
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Commits on Oct 18, 2020

expanded CenteredNorm testing
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