Selecting columns from an
laf object works as it does for a
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## S4 method for signature 'laf' x[[i]] ## S4 method for signature 'laf' x$name
an object of type
index of column to select. This should be a numeric or character vector.
the name of the column to select.
Returns an object of type
laf_column. This object behaves almost the
same as an
laf object except that is it no longer necessary
(or possible) to specify which column should be used for functions that
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