miceadds (version 1.5-0)

Reval: RUtilities: Evaluates a String as an Expression in R

Description

This function evaluates a string as an Rexpression.

Usage

Reval(Rstring, print.string=TRUE)

Revalpr(Rstring, print.string=TRUE)	# = Reval( print(Rstring) )

Revalprstr(Rstring, print.string=TRUE)   #  = Reval( print(str(Rstring)) )

Arguments

Rstring

String which shall be evaluated in R

print.string

Should the string printed on the console?

Details

The string is evaluated in the parent environment. See base::eval for the definition of environments in R.

Examples

# This function is simply a shortage function
# See the definition of this function:
Reval <- function( Rstring , print.string=TRUE){ 
    if (print.string){ cat( paste( Rstring ) , ""  ) }
    	eval.parent( parse( text = paste( Rstring )) , n=1 )
            }
  
Reval( "a <- 2^3" )
  ## a <- 2^3 
a
  ## [1] 8