From s.blomberg1 at uq.edu.au  Mon Apr 14 09:03:23 2008
From: s.blomberg1 at uq.edu.au (Simon Blomberg)
Date: Mon, 14 Apr 2008 17:03:23 +1000
Subject: [Rd] && and ||
In-Reply-To: <119453.25747.qm@web46003.mail.sp1.yahoo.com>
References: <119453.25747.qm@web46003.mail.sp1.yahoo.com>
Message-ID: <1208156603.4279.77.camel@sib-sblomber01d.sib.uq.edu.au>

Use the vector versions: & and |

Cheers,

Simon.

On Sun, 2008-04-13 at 23:48 -0700, Yuan Jian wrote:
> Hello there,
>    
>   I got a small problem about logical calculation:
>   we can get a sequene from a+b as below:
>    
>   > a<-c(1,2)
> > b<-c(3,4)
> > a+b
> [1] 4 6
>    
>   but when the sequences are logical. (I want to get (True,False) && (True, True) ==> (True, False), but when I do as below.
> > e<-c(T,T)
> > f<-c(F,T)
> > e
> [1] TRUE TRUE
> > f
> [1] FALSE  TRUE
> > g<-e && f
>   **g becomes one logical value only
> > g
> [1] FALSE
> > 
> what should I do when I want to get a sequence for operate && or ||?
>    
>   kind regards
>   Yu
>    
> 
>         
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
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-- 
Simon Blomberg, BSc (Hons), PhD, MAppStat. 
Lecturer and Consultant Statistician 
Faculty of Biological and Chemical Sciences 
The University of Queensland 
St. Lucia Queensland 4072 
Australia
Room 320 Goddard Building (8)
T: +61 7 3365 2506
http://www.uq.edu.au/~uqsblomb
email: S.Blomberg1_at_uq.edu.au

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The combination of some data and an aching desire for 
an answer does not ensure that a reasonable answer can 
be extracted from a given body of data. - John Tukey.



[Rd] && and ||
Simon Blomberg