dfidx (version 0.1-0)

methods.dfidx: Methods for dfidx

Description

A dfidx is a data.frame with a "sticky" data.frame column which contains the indexes. Specific methods of functions that extract lines and/or columns of a data.frame are provided.

Usage

# S3 method for dfidx
[(x, i, j, drop)
# S3 method for dfidx
as.data.frame(x, row.names = NULL, optional = FALSE, ...)
# S3 method for dfidx
print(x, ..., n = 10L)
# S3 method for dfidx
head(x, n = 10L, ...)
# S3 method for dfidx
[[(x, y)
# S3 method for dfidx
$(x, y)
# S3 method for dfidx
$(object, y) <- value
# S3 method for dfidx
[[(object, y) <- value
# S3 method for xseries
print(x, ..., n = 10L)
# S3 method for idx
print(x, ..., n = 10L)
# S3 method for dfidx
mean(x, ...)

Value

as.data.frame and mean return a data.frame, [[ and $ a vector, [ either a dfidx or a vector, $<-

and [[<- modify the values of an existing column or create a new column of a dfidx object, print is called for its side effect

Arguments

x, object

a dfidx object

i

the row index

j

the column index

drop

if TRUE a vector is returned if the result is a one column data.frame

row.names, optional

arguments of the generic as.data.frame method, not used

...

further arguments

n

the number of rows for the print method

y

the name or the position of the series one wishes to extract

value

the value for the replacement method

Author

Yves Croissant

Examples

mn <- dfidx(munnell)
# extract a series (returns as a xseries object)
mn$gsp
# or
mn[["gsp"]]
# extract a subset of series (returns as a dfidx object)
mn[c("gsp", "unemp")]
# extract a subset of rows and columns
mn[mn$unemp > 10, c("utilities", "water")]
# dfidx, idx and xseries have print methods as (like tibbles), a n
# argument
print(mn, n = 3)
print(idx(mn), n = 3)
print(mn$gsp, n = 3)
# a dfidx object can be coerced to a data.frame
head(as.data.frame(mn))