cast2zoocat: Cast a data frame to a 'zoocat' object

In ran-ran/zoocat: 'zoo' Objects with Column Attributes

Description

Cast a data frame to a "zoocat" object. The data frame should be a long format data frame (for example, melted by reshape2::melt).

Usage

cast2zoocat(x, index.var, value.var, attr.var = NULL, fun.aggregate = NULL,
  del.unique.cattr = TRUE)

Arguments

x	a data frame.
index.var	the name of the column to be treated as the index of the zoocat object.
value.var	the name of the column which stored the values.
attr.var	the name of the column which will be used as column attributes of the zoocat object. If NULL, all columns except value.var and index.var will be used.
fun.aggregate	aggregation function needed if variables do not identify a single observation for each output cell. Defaults to length (with a message) if needed but not specified. See dcast.
del.unique.cattr	logical. If TRUE, the column attibutes with unique value will be deleted.

Value

a "zoocat" object.

Examples

df <- data.frame(year = rep(1991 : 1995, each = 24), month = rep(1 : 12, 10),
                 varname = rep(c('a', 'b'), each = 12), city = rep(1 : 3, each = 40),
                 value = 1 : 120)
cast2zoocat(df, index.var = 'year', value.var = 'value')
cast2zoocat(df, index.var = 'year', value.var = 'value', attr.var = 'varname')

## This is the air quality example from package reshape2
names(airquality) <- tolower(names(airquality))
aqm <- melt(airquality, id = c("month", "day"), na.rm=TRUE) 
head(aqm)
cast2zoocat(aqm, index.var = 'month', value.var = 'value', attr.var = 'variable')
cast2zoocat(aqm, index.var = 'month', value.var = 'value')

ran-ran/zoocat documentation built on May 26, 2019, 10:56 p.m.