r_md5sum(C;S)

Function type

Vector only

Syntax

r_md5sum(C;S)

Input

Argument Type Description

Argument	Type	Description
`C`	any	A space- or comma-separated list of column names `C` may also be a string expression (in single quotes) constituting a pattern for matching columns. For instance, `'foo*'` specifies all columns that begin with "foo". If `C` is omitted, the values in all of the columns are included.
`S`	integer	A boolean column or an expression in `rcv_`/`rcn_`/`rct_` which determines whether or not that column is selected to be included in the calculation. See System variables for more information about `rcv_`/`rcn_`/`rct_`. If `S` is omitted, all columns will be considered by the function (subject to any prior column selections).

C

any

A space- or comma-separated list of column names

C may also be a string expression (in single quotes) constituting a pattern for matching columns. For instance, 'foo*' specifies all columns that begin with "foo".

If C is omitted, the values in all of the columns are included.

S

integer

A boolean column or an expression in rcv_/rcn_/rct_ which determines whether or not that column is selected to be included in the calculation. See System variables for more information about rcv_/rcn_/rct_.

If S is omitted, all columns will be considered by the function (subject to any prior column selections).

Return Value

For each row of the table, r_md5sum returns a text value representing the 32-digit hexadecimal number that corresponds to the MD5 hash (checksum) of the values in the columns specified by C.

Sample Usage


`c1`	`c2`	`c3`	`c4`	`r_md5sum(;)`	`r_md5sum(c1 c2;)`
2	5	7	2	f7b45cb967082666461b6e14687ce7ab	11f001789301a4c7a73054491ea608ef
7	7	4	1	3ab5875d55c0d75e778866979be4d178	d3f9e81adfce95fd40dc8ada3b8b8a3a
NA	0	9	3	9f7d520c1d3d58a525972681039f3b22	a8d367e604b13a3e77e34a77ad49c572
NA	NA	NA	NA	df3abb567fd6267b4e3900ad939d0ae5	98dcdc66177e7fdb1bcc21facfb7da8c