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Allow calling correlation_heatmap on Table with non-numerical columns #89

@lars-reimann

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@lars-reimann

Is your feature request related to a problem?

Currently, calling correlation_heatmap on a Table with non-numerical columns raises a NonNumericColumnError. Because of this, a user first must create a Table containing only the numerical columns before the method can be called. This Table may not be needed afterwards, so this is just an unnecessary step for users. For a visualization method meant to provide an overview of the data, that's too cumbersome.

Desired solution

Just ignore the non-numerical columns and plot the others.

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