The sfsmisc Package - NexTag Supports Open Source Initiatives

4 D1D2
Details
Value
Only codes in 0:127 make up the ASCII encoding which should be identical for all R versions,
whereas the ‘upper’ half is often determined from the ISO-8859-1 (aka “ISO-Latin 1)” encoding,
but may well differ, depending on the locale setting, see also Sys.setlocale.
AsciiToInt (and hence ichar) and chars8bit return a vector of the same length as their
argument.
strcodes(x, tab) returns a list of the same length and names as x with list components
of integer vectors with codes in 0:255.
Author(s)
Martin Maechler, partly in 1991 for S-plus
Examples
chars8bit(65:70)#-> "A" "B" .. "F"
stopifnot(identical(LETTERS, chars8bit(65:90)),
identical(AsciiToInt(LETTERS), 65:90))
## Not run:
## may only work in ISO-latin1 locale (not in UTF-8):
strcodes(c(a= "ABC", ch="1234", place = "Zürich"))
## gives
$a
[1] 65 66 67
$ch
[1] 49 50 51 52
$place
[1] 90 252 114 105 99 104
## End(Not run)
D1D2
Numerical Derivatives of (x,y) Data via Smoothing Splines
Description
Usage
Compute numerical derivatives of f() given observations (x,y), using cubic smoothing splines
with GCV, see smooth.spline. In other words, estimate f ′ () and/or f ′′ () for the model
Y i = f(x i ) + E i , i = 1, . . . n,
D1D2(x, y, xout = x, spar.offset = 0.1384, deriv = 1:2, spl.spar = NULL)