Create a specular colormap

2019 3 15
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I'm using the patch function with a "hot" colormap.
However, I'd like the colormap to be specular; namely I'd like it to be centered on zero and have the same color for positive and negative values with the same absolute value.
Is it possible to do it?

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Adam
Adam 2019-3-15
编辑：Adam 2019-3-15

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figure; imagesc( rand(100) - 0.5 ); % Random data centred on 0
baseCmap = hot( 256 );
cmap = [ flip( baseCmap(2:end,:) ); baseCmap ];
colormap( cmap )
caxis( [-0.5 0.5] )

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