as.symbols memisc 0.99.26.3

Construction of Lists of Symbols

Description

as.symbols and syms are functions potentially useful in connection with foreach and xapply. as.symbols produces a list of symbols from a character vector, while syms returns a list of symbols from symbols given as arguments, but it can be used to construct patterns of symbols.

Usage

as.symbols(x)
syms(...,paste=FALSE,sep="")

Arguments

x

a character vector

...

character strings or (unquoted) variable names

paste

logical value; should the character strings ``paste``d into one string?

sep

a separator string, passed to paste.

Value

A list of language symbols (results of as.symbol - not graphical symbols!).

Examples

as.symbols(letters[1:8])

[[1]]
a

[[2]]
b

[[3]]
c

[[4]]
d

[[5]]
e

[[6]]
f

[[7]]
g

[[8]]
h

syms("a",1:3,paste=TRUE)

[[1]]
a1

[[2]]
a2

[[3]]
a3

sapply(syms("a",1:3,paste=TRUE),typeof)

[1] "symbol" "symbol" "symbol"