[R] figure out whether 1 is between two numbers

[Duncan Murdoch]

On 2/18/2006 1:13 AM, Robert W. Baer, Ph.D. wrote:
> Try:
> (X>1 & Y<1) | (X<1 & Y>1)

This is a minor stylistic suggestion: when translating the mathematical 
expression (a < b < c), write it as (a < b) & (b < c).  It has no effect 
on the outcome, but keeping the inequalities in the same direction makes 
the meaning more obvious.

If you do this, your expression becomes

(Y<1 & 1<X) | (X<1 & 1<Y)

and it's clear at a glance what's going on.

I think I originally read this suggestion in something written by 
Kernighan and/or Plauger, I can't claim credit for it.

Duncan Murdoch

> 
> Rob
> ----- Original Message ----- 
> From: "Taka Matzmoto" <sell_mirage_ne at hotmail.com>
> To: <r-help at stat.math.ethz.ch>
> Sent: Friday, February 17, 2006 11:20 PM
> Subject: [R] figure out whether 1 is between two numbers
> 
> 
>> Hi R users
>>
>> I have two variables (X and Y)
>>
>> X <-  rnorm(100,.7,.5)
>> Y <-  rnorm (100,.3,.1)
>>
>> I like to know whether 1 is between each pair of X and Y or not.
>>
>> Thanks
>>
>> TM
>>
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> 
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