[R] == operand

[Gustavo Carvalho]

Hello,

You assigned 53 to c, not cc. Also, take a look at this:

http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f


On Tue, Dec 9, 2008 at 9:36 PM, Renny Li <rennyli at yahoo.com> wrote:
> Hi,
>
> I am trying to compare two values using "==" operand, please take a look of the following example (I copied ALL what I did here without deleting any line)
>
>>    bb<-1
>> cc<-50
>> cc==abs(bb+52)
> [1] FALSE
>> C<-53
>> C<-53
>> c<-53
>> cc==abs(bb+52)
> [1] FALSE
>
> I am expecting to see a TRUE here. Then I tried another way,
>
>> abs(1+52)
> [1] 53
>> cc==abs(1+52)
> [1] FALSE
>
> Why it is FALSE. Then I tried
>
>
>> d<-abs(b+52)
> Error: object "b" not found
>> d<-abs(bb+52)
>> d
> [1] 53
>> c==d
> [1] TRUE
>
> Now it is TRUE, but a wired thing is as following,
>> c==abs(bb+52)
> [1] TRUE
>
> The coding "c==abs(bb+52)" is just the same from the 3line in the top, why 2 different results? HOWEVER, it is not repeatable, I am glad I did not close the window.
>
> Also,
>> c<-0.5-0.1
>> n<-0.6-0.2
>> n==c
> [1] FALSE
>
> So, is "==" comparing formula or result?
>
> Thanks,
> Renny
>
>
>
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>
>
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