Message-ID: <1123105050.4100.13.camel@localhost.localdomain>
Date: 2005-08-03T21:37:30Z
From: Marc Schwartz
Subject: problem with for()
In-Reply-To: <5860A155-CE7B-4BDF-A184-282E5D23F9F4@tin.it>
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