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
Simon Gatehouse
CSIRO Exploration and Mining,
Newbigin Close off Julius Ave
North Ryde, NSW
Mail: PO Box 136, North Ryde
NSW 1670, Australia
Phone: 61 (2) 9490 8677
Fax: 61 (2) 9490 8921
Mobile: 61 0407 130 635
E-mail: simon.gatehouse at csiro.au
Web Page: http://www.csiro.au/
vectorize an expression
3 messages · Simon.Gatehouse@csiro.au, Uwe Ligges, Brian Ripley
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,
Newbigin Close off Julius Ave
North Ryde, NSW
Mail: PO Box 136, North Ryde
NSW 1670, Australia
Phone: 61 (2) 9490 8677
Fax: 61 (2) 9490 8921
Mobile: 61 0407 130 635
E-mail: simon.gatehouse at csiro.au
Web Page: http://www.csiro.au/
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On Wed, 2 Apr 2003 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]]
aa <- bb[cbind(1:n, cc[1:n])]
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595