Hi everyone
thanks for the replies.
The issue was NOT a font problem; I deliberately chose ll1 and l11 as
examples of easily confused variable names (evidently these were too
easily confused ;-). The code snippet was written as intended, and
increment() contained a deliberate, highlighted, bug. I was asking
for guidance on avoiding/finding this sort of coding error.
That was why I wrote "#bug here" in the original code, and why the
function was called increment()---because the function should have
incremented x by adding a variable whose value was 1 (of course, the
function as written, contrary to the desired functionality of
increment(), added a variable whose value was 2). I guess I wasn't
explicit enough here. Sorry.
The fundamental problem was, how to tell that a variable being used in
a function is not local?
One answer (thanks Patrick!): conflicts() shows masked objects on the
search path, which is not quite what I need: I want some way to list
all non-local variables that increment() uses in its body.
[The original variable names referred to genetic bandsharing data for
possums, eg
coates.female.pouchyoung.allbands.method5
and
huapai.young.male.sibling.relatedness.method3
and
huapai.old.female.nonsibling.relatedness.justdarkbands.method1
ad nauseum...hence the need for shorter example variable names!]
ll1 <- 2 #sic
increment <- function(x)
{
l11 <- 1 #sic
return(x+ll1) #sic; deliberate bug here (sic)
}
--
Robin Hankin, Lecturer,
School of Geography and Environmental Science
Tamaki Campus
Private Bag 92019 Auckland
New Zealand
[EMAIL PROTECTED]
tel 0064-9-373-7599 x6820; FAX 0064-9-373-7042
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