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summab
2007 Oct 01
1
Speeding up image plots
Dear R-users,
I wonder whether it is possible to speed up plots of 2-dimensional
images (such as image() or levelplot()) in order to export lower quality
versions of the resulting plots.
I intend to export a large number of images in order to construct
animated gifs. For this purpose, I used the png()-function in
conncection with image() and levelplot(). But the underlying arrays are
so big
2019 Jun 21
4
Calculation of e^{z^2/2} for a normal deviate z
You may want to look into using the log option to qnorm
e.g., in round figures:
> log(1e-300)
[1] -690.7755
> qnorm(-691, log=TRUE)
[1] -37.05315
> exp(37^2/2)
[1] 1.881797e+297
> exp(-37^2/2)
[1] 5.314068e-298
Notice that floating point representation cuts out at 1e+/-308 or so. If you want to go outside that range, you may need explicit manipulation of the log values. qnorm()