modSubset function provides a tidy wrapper for the ExprsArray
subset method. pipeSubset provides a tidy wrapper for the
ExprsPipeline subset method.
modSubset(object, colBy, include)
pipeSubset(object, colBy, include)ExprsArray or ExprsPipeline object to subset.colBy
to include in the subset.ExprsArray or ExprsPipeline object.
pipeSubset: The ExprsPipeline analogue of modSubset.