On Wed, Mar 26, 2003 at 11:20:04PM +1200, Ko-Kang Kevin Wang wrote:> Hi, > > I'm not sure if this can be done but.. > > I know that with ifelse() I can do something like: > ifelse(x <= 3, 1, 2) > to go through each element in my vector x, and if x_i <= 3 substitute the > number with 1 else with 2. Essentially I'll get a vector with 2 levels. > > Can I tweak it so I can get 3-levels? For example: > if(x <= 3) then 1 > elseif(3 < x <= 4) then 2 > elseif(x > 4) then 3You can, like this (1 if zz < 5, 2 if 5 <= zz < 10, 3 if zz >= 10)> zz <- 1:20 > ifelse(zz < 5, 1, ifelse(zz < 10, 2,3))[1] 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 Cheers Jason -- Indigo Industrial Controls Ltd. 64-21-343-545 jasont at indigoindustrial.co.nz
Hi,
I'm not sure if this can be done but..
I know that with ifelse() I can do something like:
ifelse(x <= 3, 1, 2)
to go through each element in my vector x, and if x_i <= 3 substitute the
number with 1 else with 2. Essentially I'll get a vector with 2 levels.
Can I tweak it so I can get 3-levels? For example:
if(x <= 3) then 1
elseif(3 < x <= 4) then 2
elseif(x > 4) then 3
--
Cheers,
Kevin
------------------------------------------------------------------------------
/* Time is the greatest teacher, unfortunately it kills its students */
--
Ko-Kang Kevin Wang
Master of Science (MSc) Student
SLC Tutor and Lab Demonstrator
Department of Statistics
University of Auckland
New Zealand
Homepage: http://www.stat.auckland.ac.nz/~kwan022
Ph: 373-7599
x88475 (City)
x88480 (Tamaki)
Hi, I've found a much better solution than using ifelse(). I found about cut() from MASS4 Page 383, which actually does a better job . On Wed, 26 Mar 2003, Ko-Kang Kevin Wang wrote:> Date: Wed, 26 Mar 2003 23:20:04 +1200 (NZST) > From: Ko-Kang Kevin Wang <kwan022 at stat.auckland.ac.nz> > To: R Help <r-help at stat.math.ethz.ch> > Subject: ifelse() > > Hi, > > I'm not sure if this can be done but.. > > I know that with ifelse() I can do something like: > ifelse(x <= 3, 1, 2) > to go through each element in my vector x, and if x_i <= 3 substitute the > number with 1 else with 2. Essentially I'll get a vector with 2 levels. > > Can I tweak it so I can get 3-levels? For example: > if(x <= 3) then 1 > elseif(3 < x <= 4) then 2 > elseif(x > 4) then 3 > >-- Cheers, Kevin ------------------------------------------------------------------------------ /* Time is the greatest teacher, unfortunately it kills its students */ -- Ko-Kang Kevin Wang Master of Science (MSc) Student SLC Tutor and Lab Demonstrator Department of Statistics University of Auckland New Zealand Homepage: http://www.stat.auckland.ac.nz/~kwan022 Ph: 373-7599 x88475 (City) x88480 (Tamaki)