Creates a Seurat object containing only a subset of the cells in the
original object. Takes either a list of cells to use as a subset, or a
parameter (for example, a gene), to subset on.
A vector of cell names to use as a subset. If NULL
(default), then this list will be computed based on the next three
arguments. Otherwise, will return an object consissting only of these cells
subset.name
Parameter to subset on. Eg, the name of a gene, PC1, a
column name in [email protected], etc. Any argument that can be retreived
using fetch.data