[R] Simple seq() boolean equality problem

2009-02-23 Thread Daniel G Polhamus 

Hi all, thanks in advance for the help.

Can someone explain to me the following result, and what I'm doing wrong 
in the second case?


 seq(-43.7,-43.69,.001)[3]==-43.698
[1] TRUE
 seq(-43.7,-43.69,.001)[2]==-43.699
[1] FALSE
 seq(-43.7,-43.69,.001)[1]==-43.7
[1] TRUE

Dan

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Re: [R] Simple seq() boolean equality problem

2009-02-23 Thread Rolf Turner 


On 24/02/2009, at 2:29 PM, Daniel G Polhamus wrote:


Hi all, thanks in advance for the help.

Can someone explain to me the following result, and what I'm doing  
wrong

in the second case?


seq(-43.7,-43.69,.001)[3]==-43.698

[1] TRUE

seq(-43.7,-43.69,.001)[2]==-43.699

[1] FALSE

seq(-43.7,-43.69,.001)[1]==-43.7

[1] TRUE


Floating point arithmetic.  FAQ 7.31.  RTFFAQ.

cheers,

Rolf Turner

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