Is it possible to get R to output the value of an expression, that is being calculated within a function?  I've attached a very simple example but for more complicated ones would like to be able to debug by seeing what the value of specific expressions are each time it cycles through a loop that executes the expression.  I'm relatively new to this so there may be much simpler more elegant ways to do it.

For example, is there a command I can put within the function "funct01" that will output the value of z1 to the screen?

Thanks

Jim

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## Practice file to try out evaluations

y <- 5

(x <- y^2)

funct01 <- function (x,y) {

    z1 <- x + y
    z2 <- x * y
    z3 <- x^y

    results <- data.frame (z1=z1, z2=z2, z3=z3)
    return(results)

}

funct01(7,9)


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Dr. Jim Maas
University of East Anglia
Norwich, UK
NR4 7TJ

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