Between the values
Shubha Vishwanath Karanth wrote:
Or at least anyways of defining a vector/(or something like that) which has all values between 0 and 1? For example: C(0,1) is incorrect, seq(0,1,0.2) is also incorrect, seq(0,1,0.00001) is also incorrect.... How does one specify this?
Hi Shubha, What are you trying to do? The set of all real numbers between 0 and 1 is infinitely large. Obviously you can't explicitly construct an infinitely large vector in R. If you want to construct an implicit specification of that set, then I think I've already given you a good answer in R: define a predicate function and use it. E.g. between <- function(x, low, high) x > low && x < high I don't know much at all about symbolic mathematics packages like Maple and Mathematica, but maybe you're thinking of something you can do in those softwares? R is not trying to be a competitor to them; they do lots of things R doesn't, and vice versa. Dan
Shubha Vishwanath Karanth wrote:
Thanks, Shubha -----Original Message----- From: Dan Davison [mailto:davison at stats.ox.ac.uk] Sent: Tuesday, August 12, 2008 5:54 PM To: Shubha Vishwanath Karanth Cc: r-help at stat.math.ethz.ch Subject: Re: [R] Between the values On Tue, Aug 12, 2008 at 05:16:01PM +0530, Shubha Vishwanath Karanth wrote:
Hi R, This is a very trivial one.... C=0.1 I want to check whether my value of C is between 0 and 1
exclusively....
I don't want to use (C>0 & C<1). And I can't use a single statement
like
(0<C<1). Is there a between function? Or how do we specify from 0 to
1?
Does %in% help me?
If you don't like (C > 0 && C < 1), then just write your own function is.between(x, low, high) (NB1 you've basically written it already; NB2 single '&' for the vectorised version 'are.between'). People's personal tastes about what's desirable will vary, and anyway it's good practice to build up your own personal library of functions. Ultimately if you have a high quality collection of related functions for working on a particular sort of problem, then you should publish them as an R package on CRAN. Dan
Many Thanks, Shubha This e-mail may contain confidential and/or privileged
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