Re: [R] problem with for()

From: Simone Gabbriellini <ogabbrie_at_tin.it>
Date: Thu 04 Aug 2005 - 08:25:15 EST

how can I have a 0 evaluated in my loop then? it is important for my algorithm

do you have any hints?

simone

Il giorno 03/ago/05, alle ore 23:37, Marc Schwartz ha scritto:

> On Wed, 2005-08-03 at 23:24 +0200, Simone Gabbriellini wrote:
>
>> Dear list,
>> can someone tell me why this two pieces of code give me the same
>> results?
>>
>>
>>> for(i in 0:5){ sum[i] = i }
>>> sum
>>>
>> [1] 1 2 3 4 5
>>
>>
>>> for(i in 1:5){ sum[i] = i }
>>> sum
>>>
>> [1] 1 2 3 4 5
>>
>> shouldn't the first one be
>>
>> 0 1 2 3 4 5
>>
>> thank you,
>> simone
>>
>
> No....the indexing of R objects is 1 based. Thus your first loop tried
> to set i[0], which is a non-existent entry.
>
>
>> i <- 0:5
>>
>
>
>> i
>>
> [1] 0 1 2 3 4 5
>
>
>> i[0]
>>
> numeric(0)
>
>
>> i[1]
>>
> [1] 0
>
> HTH,
>
> Marc Schwartz
>
>
>
>



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