Decision tree why do I need to prune again although matlab has an automatic pruning included?

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Tania
Tania 2014-7-31
Hi! I would like to know why matlab recommends to prune again, although the function fitrtree already includes the function prune (default:on)?
Eg.: http://www.mathworks.co.uk/help/stats/classification-trees-and-regression-trees.html#bsw6bhd
Thank you!

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