On Tue, 13 May 2008, Charles Plessy wrote:
Dear list,I realised by chance when analysing a 1521862 × 8 matrix that plotting was much faster when using "." as the argument of `pch'.
Why is that surprising? Drawing a small square is rather easy compared to a circle, say.
I was just wondering if there were other ways to get this speed improvement: it is otherwise quite difficult to explore such big matrices, especially given that X11 redraws the plot whenever its window is covered/uncovered by another window, or when I switch virtual desktops.
That is a function of your X setup. R does ask for backing store to be used, and so it seeems your setup is not doing so. Also, the type="cairo" in X11() will repaint from a backing pixmap.
You might want to contemplate better ways to visualize 1.5m points. It is not clear what plot you are actually doing, but a density plot is likely to be more informative (especially a 2D pairs plot of densities), or a hexbin plot (from the BioC package or that name) or ....
Best regards, -- Charles Plessy, Wakō, Saitama, Japan ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help 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, [EMAIL PROTECTED] 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
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
