# datatable.sd()¶

Calculate the standard deviation for each column from cols.

## Parameters¶

cols
Expr

Input columns.

return
Expr

f-expression having one row, and the same names and number of columns as in cols. The column stypes are float32 for float32 columns, and float64 for all the other numeric types.

except
TypeError

The exception is raised when one of the columns from cols has a non-numeric type.