[R] question on extracting binary data from pdf image
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Sep 8 18:47:41 CEST 2008
On Mon, 8 Sep 2008, Li, Xiaochun wrote:
> Dear List,
> If I use the following code to generate a pdf,
> image(x, y, !is.na(z), col=c("green","black"))
> Can someone extract the 0-1 data (that is, is.na(z)) from the Adobe source?
Yes (from the PDF file, which is not due to Adobe but R). Indeed, a PDF
viewer has to do that to show you the image. In fact given the way R's
pdf driver works it is rather easy to do.
> Thank you.
> [[alternative HTML version deleted]]
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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
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