datatable.rowmax()

datatable.

rowmax

(

*cols

)

sourcetests

For each row, find the largest value among the columns from cols.

Parameters

cols

FExpr

Input columns.

return

FExpr

f-expression consisting of one column that has the same number of rows as in cols. The column stype is the smallest common stype for cols, but not less than int32.

except

TypeError

The exception is raised when cols has non-numeric columns.

Examples

from datatable import dt, f DT = dt.Frame({"A": [1, 1, 2, 1, 2], "B": [None, 2, 3, 4, None], "C":[True, False, False, True, True]}) DT

	A	B	C
	int32	int32	bool8
0	1	NA	1
1	1	2	0
2	2	3	0
3	1	4	1
4	2	NA	1

5 rows × 3 columns

DT[:, dt.rowmax(f[:])]

	C0
	int32
0	1
1	2
2	3
3	4
4	2

5 rows × 1 column

See Also

• rowmin() – find the smallest element row-wise.