Community lambdas.

Copyable definitions. Tested. Tagged. Star the ones you use.

Name	Signature	Description	Tags	★
PIVOT.CAST	(table, rows, cols, value, [agg])	Pivot a long table to wide. agg defaults to SUM.	reshape	488
PIVOT.MELT	(table, id_cols)	Unpivot a wide table into a tall one. Keeps id columns, melts everything else into name/value rows.	reshape, array	412