reshape-4u: Casting workhorse.

In reshape: Flexibly Reshape Data

Casting workhorse.

Description

Takes data frame and variable list and casts data.

Usage

reshape1(data, vars = list(NULL, NULL), fun.aggregate=NULL, margins,
  df=FALSE, fill=NA, add.missing=FALSE, ...)

Arguments

data	data frame
vars	variables to appear in columns
fun.aggregate	variables to appear in rows
margins	aggregation function
df	should the aggregating function be supplied with the entire data frame, or just the relevant entries from the values column
fill	vector of variable names (can include "grand_col" and "grand_row") to compute margins for, or TRUE to computer all margins
add.missing	value with which to fill in structural missings
...	further arguments are passed to aggregating function

Author(s)

Hadley Wickham <[e-mail]>

See Also

cast

Examples

ffm <- melt(french_fries, id=1:4, na.rm = TRUE)
# Casting lists ----------------------------
cast(ffm, treatment ~ rep | variable, mean)
cast(ffm, treatment ~ rep | subject, mean)
cast(ffm, treatment ~ rep | time, mean)
cast(ffm, treatment ~ rep | time + variable, mean)
names(airquality) <- tolower(names(airquality))
aqm <- melt(airquality, id=c("month", "day"), preserve=FALSE)
#Basic call
reshape1(aqm, list("month", NULL), mean)
reshape1(aqm, list("month", "variable"), mean)
reshape1(aqm, list("day", "month"), mean)

#Explore margins  ----------------------------
reshape1(aqm, list("month", NULL), mean, "month")
reshape1(aqm, list("month", NULL) , mean, "grand_col")
reshape1(aqm, list("month", NULL) , mean, "grand_row")

reshape1(aqm, list(c("month", "day"), NULL), mean, "month")
reshape1(aqm, list(c("month"), "variable"), mean, "month")
reshape1(aqm, list(c("variable"), "month"), mean, "month")
reshape1(aqm, list(c("month"), "variable"), mean, c("month","variable"))

reshape1(aqm, list(c("month"), "variable"), mean, c("grand_row"))
reshape1(aqm, list(c("month"), "variable"), mean, c("grand_col"))
reshape1(aqm, list(c("month"), "variable"), mean, c("grand_row","grand_col"))

reshape1(aqm, list(c("variable","day"),"month"), mean,c("variable"))
reshape1(aqm, list(c("variable","day"),"month"), mean,c("variable","grand_row"))
reshape1(aqm, list(c("month","day"), "variable"), mean, "month")

# Multiple fnction returns  ----------------------------
reshape1(aqm, list(c("month", "result_variable"), NULL), range)
reshape1(aqm, list(c("month"),"result_variable") , range)
reshape1(aqm, list(c("result_variable", "month"), NULL), range)

reshape1(aqm, list(c("month", "result_variable"), "variable"), range, "month")
reshape1(aqm, list(c("month", "result_variable"), "variable"), range, "variable")
reshape1(aqm, list(c("month", "result_variable"), "variable"), range, c("variable","month"))
reshape1(aqm, list(c("month", "result_variable"), "variable"), range, c("grand_col"))
reshape1(aqm, list(c("month", "result_variable"), "variable"), range, c("grand_row"))

reshape1(aqm, list(c("month"), c("variable")), function(x) diff(range(x))) 

reshape documentation built on June 19, 2025, 5:08 p.m.