Selecting columns from datasets

[mikera]

It is very useful to have a convenient way to select columns from a Dataset-like structure.

Syntax idea:

(select-columns DATA ["Name" "Age" "Height"])
=> [a Nx3 matrix taking the name, age and height columns in that order from DATA]

Logic for selecting columns would be:

• If the selection value is a number, take the numbered column from the dimension as usual
• Otherwise, look up the column in the dataset column names
• Throw an error if the column is still not found

[mikera]

@mschuene we should make sure this lines up well with your select functionality....

[mschuene]

Yes, dataset could just implement the select protocol functions and accept column names there