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tderiv
2006 Aug 15
0
Help with workaround for: Function '`[`' is not in thederivatives table
...--Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Earl F. Glynn
> Sent: Tuesday, 15 August 2006 8:44 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Help with workaround for: Function '`[`' is not in
thederivatives table
>
> # This works fine:
> > a <- 1
> > b <- 2
> > c <- 3
> > E <- expression(a * exp(b*X) + c)
> > X <- c(0.5, 1.0, 2.0)
> > eval(E)
> [1] 5.718282 10.389056 57.598150
> > D(E, "b")
> a * (exp(b * X) * X)
&g...
2006 Aug 14
1
Help with workaround for: Function '`[`' is not in the derivatives table
# This works fine:
> a <- 1
> b <- 2
> c <- 3
> E <- expression(a * exp(b*X) + c)
> X <- c(0.5, 1.0, 2.0)
> eval(E)
[1] 5.718282 10.389056 57.598150
> D(E, "b")
a * (exp(b * X) * X)
> eval(D(E, "b"))
[1] 1.359141 7.389056 109.196300
# But if (a,b,c) are replaced with (A[1], A[2], A[3]), how can I get a
derivative