Re: [R] recursively divide a value to get a sequence

From: Daniel Malter <daniel_at_umd.edu>
Date: Wed, 09 Jul 2008 06:10:23 -0400

your.number=15000
your.denominator=5
your.favorite.n=9
your.vector=NULL

for(i in 0:your.favorite.n){

    your.vector[i+1]=your.number/your.denominator^i     your.vector[your.favorite.n+1]=0
    }
your.vector ##check

Best,
Daniel



cuncta stricte discussurus

-----Ursprüngliche Nachricht-----
Von: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org] Im Auftrag von Anne-Marie Ternes
Gesendet: Wednesday, July 09, 2008 5:40 AM An: r-help_at_r-project.org
Betreff: [R] recursively divide a value to get a sequence

Hi,

if given the value of, say, 15000, I would like to be able to divide that value recursively by, say, 5, and to get a vector of a determined length, say 9, the last value being (set to) zero- i.e. like this:

15000 3000 600 120 24 4.8 0.96 0.192 0

These are in fact concentration values from an experiment. For my script, I get only the starting value (here 15000), and the factor by which concentration is divided for each well, the last one having, by definition, no antagonist at all.

I have tried to use "seq", but it can "only" do positive or negative increment. I didn't either find a way with "rep", "sweep" etc. These function normally start from an existing vector, which is not the case here, I have only got a single value to start with.

I suppose I could do something "loopy", but I'm sure there is a better way to do it.

Thanks a lot for your help, hope the question is not too dumb...

Anne-Marie



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