[R] Conditional operations in R

[ramoss]

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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