Message-ID: <49CFD2E8.8090908@unicas.it>
Date: 2009-03-29T19:58:32Z
From: Domenico Vistocco
Subject: binary AND operators in R
In-Reply-To: <6B32C438581E5D4C8A34C377C3B334A401752A39@FBCMST11V04.fbc.local>
You should find the functions:
bitAnd, bitOr and bitXor
in the bitops package.
Ciao,
domenico
mauede at alice.it wrote:
> I cannot find any R function or operator that performs a binary AND operation, as performed by Fortran built-in function "iand".
> Ideally either R operator "&" or "&&" should do that. But some tests proved they do not:
>
>> A<- 1
>> B <- 2
>> A
>>
> [1] 1
>
>> B
>>
> [1] 2
>
>> as.numeric(A&B)
>>
> [1] 1
>
>> as.numeric(A&&B)
>>
> [1] 1
>
> The binary content of A should be "10000"
> The binary content of B should be "01000"
> Therefore the bitwise AND operator should yield 0 !
> I do not know how to fore the binary representation of an unsigned integer when writing R code.
> Do you know how to get around this problem ?
>
> Thank you so much.
> Maura
>
>
> tutti i telefonini TIM!
>
>
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