[R] Manipulating code?

[bogdan romocea]

Macro stuff à la SAS is something that should be avoided whenever
possible - it's messy, limited, and limiting. (I've done it
ocasionally and it works, but I think it's best not to go there.) Read
the documentation on lists (in particular named lists), and keep
everything in one or more lists. For example:
lst <- list()
for (v in c("var1","var2","var3")) lst[[v]] <- runif(sample(c(50,100),1))
for (v in c("var1","var2","var3")) print(sd(lst[[v]]))


> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Johannes Hüsing
> Sent: Tuesday, May 23, 2006 12:26 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Manipulating code?
>
> Dear expeRts,
> I am currently struggling with the problem of finding
> cut points for a set of stimulus variables. I would like
> to obtain cut points iteratively for each variable by
> re-applying a dichotomised variable in the model and then
> recalculate it. I planned to have fixed names for the
> dichotomised variables so I could use the same syntax
> for every recalculation of the whole model. I furthermore
> want to reiterate the process until no cut point changes
> any more.
>
> My problem is in accomplishing this syntactically. How can
> I pass a variable name to a function without getting lost
> in "as.symbol" and "eval" and "parse" mayhem? I am feeling
> I am thinking too much in macro expansion à la SAS when
> trying to tackle this.
>
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