Add checks for the correct column type in all necessary commands
Framework for numerical computations, data analysis and visualisation
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Commands should evaluate, whether the passed dataset actually contains valid data columns (i.e. if a command needs numerical values, the column type should not be string). Especially valid for spline.
For simplification, we'll create a central method to query, whether the selected columns do actually only contain numerical data. Using this, it's only a matter of going through each command, adding the check and throw an error if necessary.
Tested the new checks with some random commands. No deviation was detected.
Anonymous
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Commit: [r1317]
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