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2001 Oct 07
1
Bug in Deriv? (PR#1119)
...expression not shown, it is the same for all versions.
_
platform i386-pc-mingw32
arch x86
os Win32
system x86, Win32
status
major 1
minor 3.0
year 2001
month 06
day 22
language R
-----------------------------------------------------------------
> deriv(~offv+Asym/(1+exp(-(x-xmid)/scal)),"x")
expression({
.expr4 <- exp(-x - xmid/scal) #### Wrong !!!!
> deriv(~offv+Asym/(1+exp(-x/scal+xmid/scal)),"x")
expression({
.expr5 <- exp(-x/scal + xmid/scal) ## Correct
> deriv(~offv+Asym/(1+exp((xmid-x)/scal)),"x&qu...