Message-ID: <3E8A9362.2090100@statistik.uni-dortmund.de>
Date: 2003-04-02T07:38:10Z
From: Uwe Ligges
Subject: vectorize an expression
In-Reply-To: <FFE02AF26875734B82A728403821CB2EFB043A@asp-ri.riverside.csiro.au>
Simon.Gatehouse at csiro.au wrote:
> Dear listers,
> I'm having a bad R day. I just can't think of the vectorized equivalent of:
>
> for (ii in 1:n) aa[ii] = bb[ii,cc[ii]]
>
> Any suggestion received with embarrassment and gratitude
a <- b[cbind(1:n, cc[1:n])]
Uwe Ligges
> Simon Gatehouse
> CSIRO Exploration and Mining,
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>
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