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added a reversing section

Co-authored-by: Jody Klymak <jklymak@gmail.com>Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>

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examples/color
- colormap_reference.py

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`‎examples/color/colormap_reference.py`

Lines changed: 10 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -6,7 +6,7 @@`
`6`	`6`	`Reference for colormaps included with Matplotlib.`
`7`	`7`
`8`	`8`	`A reversed version of each of these colormaps is available by appending`
`9`		-``_r`` to the name,e.g., ``viridis_r``.
	`9`	+``_r`` to the name,as shown in :ref:`reverse-cmap`.
`10`	`10`
`11`	`11`	See :doc:`/tutorials/colors/colormaps` for an in-depth discussion about
`12`	`12`	`colormaps, including colorblind-friendliness.`
`@@ -15,7 +15,6 @@`
`15`	`15`	`importnumpyasnp`
`16`	`16`	`importmatplotlib.pyplotasplt`
`17`	`17`
`18`		`-`
`19`	`18`	`cmaps= [('Perceptually Uniform Sequential', [`
`20`	`19`	`'viridis','plasma','inferno','magma','cividis']),`
`21`	`20`	`('Sequential', [`
`@@ -40,7 +39,6 @@`
`40`	`39`	`'gist_rainbow','rainbow','jet','turbo','nipy_spectral',`
`41`	`40`	`'gist_ncar'])]`
`42`	`41`
`43`		`-`
`44`	`42`	`gradient=np.linspace(0,1,256)`
`45`	`43`	`gradient=np.vstack((gradient,gradient))`
`46`	`44`
`@@ -67,7 +65,15 @@ def plot_color_gradients(cmap_category, cmap_list):`
`67`	`65`	`forcmap_category,cmap_listincmaps:`
`68`	`66`	`plot_color_gradients(cmap_category,cmap_list)`
`69`	`67`
`70`		`-plt.show()`
	`68`	`+`
	`69`	`+###############################################################################`
	`70`	`+# .. _reverse-cmap:`
	`71`	`+# Reversing a colormap`
	`72`	`+# --------------------`
	`73`	`+#`
	`74`	+# A colormap can be reversed by appending ``_r`` to the name. For example:
	`75`	`+`
	`76`	`+plot_color_gradients("Original and reversed ", ['viridis','viridis_r'])`
`71`	`77`
`72`	`78`	`#############################################################################`
`73`	`79`	`#`

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`‎examples/color/colormap_reference.py`

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