The function is a parameter to the tune function of library e1071. The
other parameters of the tune.control() function specify more or less the
sampling method (cross-validation, fixed or bootstrap+attributes for those)
tune itself iterates over valuevectors of the parameters (e.g. C and
gamma) and calculates errors in the classification for each combination
(using the provided sampling method in tune.control() i would guess)
also: e1071 = libsvm
and i have enough problems with R, i definetly wont start with python now ;)
The question is rather of "academic" interest, i can do what i want to
do already. But it COULD be something useful, after all it is the first
argument of the function^^
On 03.04.12 14:13, Alekseiy Beloshitskiy wrote:
Hello, Jessica,
Can you please elaborate what you're trying to find with that function.
If e.g. you want to find best parameters C and gamma for RBF model (SVM), you
can use grid.py, check here:
http://www.csie.ntu.edu.tw/~cjlin/libsvm/
Function tune.control() in package e1071 is an R interface to this algorithm.
Best,
-Alex
________________________________________
From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] on behalf of
Jessica Streicher [j.streic...@micromata.de]
Sent: 03 April 2012 11:05
To: r-help@r-project.org
Subject: [R] e1071 tune.control() random parameter
I'm not sure what the parameter specifies:
random
if an integer value is specified, random parameter vectors are drawn from the
parameter space.
What are the parameter vectors and what is the parameter space? What means
drawn?
greetings
Jessi
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