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Categorical colorscales #1747

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@alanocallaghan

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@alanocallaghan

Would it be possible to add the ability to use categorical (ie, String) values in a heatmap, mapped to a color scale?

This is currently possible only by mapping to numeric values and spoofing a colorscale and colorbar.

EG: https://i.stack.imgur.com/1MS66.png

Again apologies, in this case I realise this could require a radical overhaul of that trace

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