Displaying 3 results from an estimated 3 matches for "evalf".
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eval
2000 Oct 11
5
"Executing" a string
In Matlab or Octave I can evaluate (evalf) the content of
a string. In R I have looked around in the docs, but have not
found a way to do something equivalent (which is possible, I think).
Can anybody give me a pointer?
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Thomas Hoffmann, Institut fuer Halbleit...
2007 Feb 18
3
User defined split function in rpart
...ing functions. However, I am having
troubles with addressing the data frame used in calling rpart in my split
functions.
For example, in the evaluation function that is called once per node, I want
to fit a proportional odds model to the data in the node and use its
deviance as node deviance:
evalf <- function(y,x,parms) {
pomnode<-polr(dataframe$y~dataframe$x,dataframe,weights=dataframe$Freq)
more code
}
The dataframe used in the polr call should be the data of the current node.
How can I address the data of the current node and assign it to the
dataframe?
Tha...
2012 Mar 23
3
R numerical integration
Hi all,
Is there any other packages to do numerical integration other than the
default 'integrate'?
Basically, I am integrating:
integrate(function(x) dnorm(x,mu,sigma)/(1+exp(-x)),-Inf,Inf)$value
The integration is ok provided sigma is >0.
However, when mu=-1.645074 and sigma=17535.26
It stopped working. On the other hand, Maple gives me a value of
0.5005299403.
It is an