datatable.FExpr.__lt__()¶
Compare whether x < y
.
Like all other FExpr operators, the less-than operator is elementwise:
it produces a column where each element is the result of comparison
x[i] < y[i]
.
If x
or y
are multi-column expressions, then they must have the
same number of columns, and the <
operator will be applied to each
corresponding pair of columns. If either x
or y
are single-column
while the other is multi-column, then the single-column expression
will be repeated to the same number of columns as its opponent.
The less-than operator can be applied to columns of any type, and the
types of x
and y
are allowed to be different. In the latter
case the columns will be converted into a common stype before the
comparison.
Parameters¶
FExpr
The arguments must be either FExpr
s, or expressions that can be
converted into FExpr
s.
FExpr
An expression that evaluates x < y
. The produced column will
have stype bool8
.