Displaying 4 results from an estimated 4 matches for "espression".
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epression
2008 Mar 26
0
approxfun + save: problem as R_approx changed package
Hi all,
I recently switched to R version 2.6.2 (from 2.5.0 I was using) on Windows XP.
I have a fair amount of previous data saved in the form of "approxfun" objects created by version 2.5.0, with code basically like this:
> x <- rlnorm(100,10,2)
> f <- approxfun(1:100,x)
> f(5)
[1] 313811.3
> save(f, file="mytest_approx.Rdata")
Now on 2.6.2, when I try to
2010 Nov 03
3
optim works on command-line but not inside a function
Dear all,
I am trying to optimize a logistic function using optim, inside the
following functions:
#Estimating a and b from thetas and outcomes by ML
IRT.estimate.abFromThetaX <- function(t, X, inits, lw=c(-Inf,-Inf),
up=rep(Inf,2)){
optRes <- optim(inits, method="L-BFGS-B", fn=IRT.llZetaLambdaCorrNan,
gr=IRT.gradZL,
lower=lw, upper=up, t=t, X=X)
2012 Jan 03
1
higher derivatives using deriv
Dear everyone,
the following is obviously used to compute the nth derivative, which seems
to work
(deriv(sqrt(1 - x^2),x,n))
However, before using this, I wanted to make sure it does what I think it
does
but can't figure it out when reading the ?deriv info or any other
documentation on deriv for that matter:
deriv(expr, namevec, function.arg = NULL, tag = ".expr", hessian = FALSE,
2005 Nov 10
2
R: bug in windows GUI/script editor (PR#8288)
Hi Duncan,
I am running R in MDI mode (with localisation not installed because I need to use RWinEdt), on an Italian version of Windows 2000 Pro.
I just logged in today and tried to reproduce the bug: the first three times all was fine, the fourth one I got the bug, and finally noticed one detail: the bug appears when I open an R script (I tried several) which causes the "part of the