Generate x +/- y terms in table.

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Description

This function generates a component of a table formula to output two columns separated by a +/- sign. It is designed only for LaTeX output.

Usage

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PlusMinus(x, y, head, xhead, yhead, digits = 2, ...)

Arguments

x,y

Expressions to be displayed in the columns on the left and right of the +/- sign, respectively.

head

If not missing, this will be used as a column heading for the two columns.

xhead, yhead

If not missing, these will be used as individual column headings.

digits, ...

Parameters to pass to the format function.

Value

An expression which will produce the requested output in LaTeX.

Examples

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stderr <- function(x) sd(x)/sqrt(length(x))
latex( tabular( (Species+1) ~ Sepal.Length*
          PlusMinus(mean, stderr, digits=1), data=iris ) )