[R] Conditional operations in R

[Rui Barradas]

Hello,

In R you would use vectorized instructions, not a do while loop.


dat <- read.table(text="
client   pct_total
A          15%
B          10%
C          10%
D          9%
E           8%
F          6%
G          4%
", header = TRUE)

# Make it numeric
dat$pct_total <- with(dat, as.numeric(sub("%", "", pct_total))/100)
str(dat)  # see its STRucture

top <- which(dat$pct_total >= median(dat$pct_total))  # make index vector
sum(dat$pct_total[top])

Hope this helps,

Rui Barradas
Em 18-09-2012 15:41, ramoss escreveu:
> Hello,
>
> I am a newbie to R coming from SAS background. I am trying to program the
> following:
> I have a monthly data frame with 2 variables:
>
> client   pct_total
> A          15%
> B          10%
> C          10%
> D          9%
> E           8%
> F          6%
> G          4%
>
> I need to come up w/ a monthly list of clients that make 50% or just above
> it every month so I can pass them to the rest of the program.  In this case
> the list would contain the first 4 rows.
> top <- client[c(1,4),]
> toptot <- sum(top$PCTTOT)
> How can I make this automatic?  In SAS I would use macro w/ a do while.
> Thanks for your help.
>
>
>
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