Maas James Dr (MED) wrote:
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?
Probably ?cat is what you're looking for.
Also look at the ?debug package, or
http://www.stats.uwo.ca/faculty/murdoch/software/debuggingR/
Thanks
Jim
================================== ## 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)
=============================== Dr. Jim Maas University of East
Anglia Norwich, UK NR4 7TJ
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