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`dfr std` for expression

Creates a std expression for an aggregation of std value from columns in a dataframe

Signature

> dfr std {flags}

Input/output types:

input	output
any	any

Examples

Std value from columns in a dataframe

> [[ab]; [62] [42] [22]] |dfr into-df|dfr std
╭───┬──────┬──────╮
│# │  a   │  b   │
├───┼──────┼──────┤
│0│2.00│0.00│
╰───┴──────┴──────╯

Std aggregation for a group-by

> [[ab]; [one2] [one2] [two1] [two1]]
|dfr into-df
|dfr group-bya
|dfr agg (dfr colb|dfr std)
╭───┬─────┬──────╮
│# │  a  │  b   │
├───┼─────┼──────┤
│0│one│0.00│
│1│two│0.00│
╰───┴─────┴──────╯

Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag

dfr std for expression

Signature

Input/output types:

Examples

`dfr std` for expression