Necesito practicar con reshape2,

Necesito practicar con las funciones metl y dcast, no acabo de entender muy bien como funcionan. Si alguien tuviera una guía de ejercicios que me lo indique por favor.
I need to practice with the metl and dcast functions, I don't quite understand how they work. If anyone had an exercise guide to tell me please.
Thank you

Hi @SilviaDB, this covers the newer versions of those functions, and may be helpful.

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