R help - Feb 2009 - Simple seq() boolean equality problem

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

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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