R version 3.1.1 (2014-07-10) -- Sock it to Me
Copyright (C) 2014 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64-bit)
Dear friends - I have a small problem with diff (I guess)
I made a sequence with fixed interval between consecutive elements - and
hence thought
See FAQ 7.31.
cheers,
Rolf Turner
On 11/01/15 21:29, Troels Ring wrote:
R version 3.1.1 (2014-07-10) -- Sock it to Me
Copyright (C) 2014 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64-bit)
Dear friends - I have a small problem with diff (I guess)
I made a
Troels, this is due to the usual tiny difference between numbers
as computed by R and the numbers that you think they are!
tt - seq(0,20,by=0.02)
dtt - diff(tt)
length(dtt)
# [1] 1000
r02 - rep(0.02,1000)
unique(r02 - dtt)
# [1] 0.00e+00 3.469447e-18 -3.469447e-18
I should have added an extra line to the code below, to complete
the picture. Here it is (see below line ##.
Ted.
On 11-Jan-2015 08:48:06 Ted Harding wrote:
Troels, this is due to the usual tiny difference between numbers
as computed by R and the numbers that you think they are!
tt
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