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512289
2013 Jun 23
1
stats::convolve documentation enhancement
...articular the latter may not be obvious to first time users, who may
think that stats::convolve is slow, even though it is fast, if applied
correctly.
Moreover for zero padding, one may apply stats::nextn to (a) length(x)
or (b) length(x)+length(y)-1.
#Example:
#correct usage:
x <- rnorm(514289)
y <- rnorm(10000)
#length(x) + length(y) - 1 = 2^19
system.time(convolve(x, y, type="open"))
# user system elapsed
# 1.17 0.02 1.18
#incorrect usage:
x <- rnorm(300000)
y <- rnorm(10000)
system.time(convolve(x, y, type = "open"))
# user system elapsed...
2009 Aug 10
4
Encrypted File Storage
Anyone got any experience/suggestions for a way to store a directory of
sensitive information on a CentOS box? This directory contains many scripts
and output files, I need it backed up but not unencrypted and don't want
to store it in a tar file type archive as when it needs to be accessed and
have scripts executed/data generated, it needs to be untarred/unencrypted and
I don't know the