datatable.rowfirst()

datatable.

rowfirst

(

cols

)

sourcetests

For each row, find the first non-missing value in cols. If all values in a row are missing, then this function will also produce a missing value.

Parameters

cols

Expr

Input columns.

return

Expr

f-expression consisting of one column and the same number of rows as in cols.

except

TypeError

The exception is raised when input columns have incompatible types.

See Also

• rowlast() – find the last non-missing value row-wise.