bydf

Description

apply a function to a group of rows in the input data frame (similar to the sql group by statememnt).

Usage

bydf(df, groupColName, valColName, fun, newColName="temp_by_col_name")

bydfa(df, groupColName, valColName, fun, newColName="temp_by_col_name")

Arguments

Details

The methods currently depend on the type of to:

bydf

apply a function to a group of rows in the input data frame (similar to the sql group by statememnt). Put the results of this function in a new data frame that is returned as output.

bydfa

apply a function to a group of rows in the input data frame (similar to the sql group by statememnt). return the same data frame with an additional column with the results of the function.

Value

bydf: data frame with the function applied to the grouping bydfa: input data frame with an additional column with the results of the function applied to the grouping.

Author(s)

Andrea Franceschini

Examples

	data(uuk_screen)
	screen=add_seed(uuk_screen[1:1000,])
	screen_sd = bydf(screen, groupColName="seed7", "score", sd, "sd")

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> library(scsR)
Error in library(scsR) : there is no package called 'scsR'
Execution halted