if.R {HH}

Conditional Execution for R or S-Plus

Description

if.R uses the is.R function to determine whether to execute the expression in the r argument or the expression in the s argument. is.R, copied from the now defunct base R function, returns TRUE if running under R and returns FALSE otherwise (initially designed for S/S-PLUS).

Usage

if.R(r, s)

is.R()

Arguments

r

Any R expression, including a group of expressions nested in braces. Assignments made in this expression are available to the enclosing function.

s

Any S-Plus expression, including a group of expressions nested in braces. Assignments made in this expression are available to the enclosing function.

Details

Not all functions are in both implementations of the S language. In particular, panel functions for lattice in R (based on grid graphics) are very different from panel functions for trellis (based on the older graphics technology) in S-Plus.

is.R is copied from the now defunct base R function of the same name.

Value

For if.R the result of the executed expression.

is.R returns TRUE if we are using R and FALSE otherwise.

Author(s)

Richard M. Heiberger <[e-mail]>

See Also

R.Version

Examples

 if.R(r={"This is R."},
      s={"This is S-Plus"})

 is.R()