Displaying 10 results from an estimated 10 matches for "jonck".
2003 Jun 17
2
Clustering quality measure
...rs are formed untill
every data instance is a cluster by itself.
Therefore I was wondering if any of you are aware of any libraries or
functions within R that determine quality measures of clusterings, I am
very much intrigued by the definition of quality measures that do work.
Thanks very much, Jonck
2003 Jun 12
3
Multiple imputation
...issing data in my case. I
found several references to functions in S-Plus that perform multiple
imputation (NORM, CAT, MIX, PAN). Does R have corresponding functions?
I searched the archives but was not able to find anything conclusive
there.
Any help on this subject is much appreciated.
Thanks, Jonck
2003 Jul 24
3
Plotting math functions
...ondering whether it is possible to plot math functions, for
example sin, cos or a Gaussian type function, in R, and if so, how to
do it. I have been searching through the archives and the R manual but
had no luck in finding any hints on how to go about this.
Any help is much appreciated!
Thanks, Jonck
2003 Jun 11
3
Multiple match function?
...the first position that a value is found at. Of course I
could write my own function that loops through the vector and tests for
the presence of each value manually but it seems likely that a function
that does this is already present in R. No need to re-invent the wheel
:-)
Thanks very much, Jonck
2003 Apr 16
1
Question on SOM and clustering
Hello everyone,
I'm new to this list, so let me introduce myself: my name is Jonck van
der Kogel and I am a graduate student at the Erasmus University of
Rotterdam. I am currently working on my thesis which is on the use of
artificial intelligence for large data-sets.
To do an analysis of a certain data-set I want to use Kohonen's SOM
algorithm. However, as I understand i...
2003 Jun 09
2
Appending elements to an array
...ve been unable to find how to
dynamically add/remove elements to/from an array.
I've figured out how to do this with lists and vectors, but not with
arrays. For this particular structure I need to work with arrays.
Any help on how to do something like this would be much appreciated.
Thanks, Jonck
2003 Jun 14
1
Missing data augmentation
...ect way to go to me however.
In my opionion the correct way of doing things would be to impute the
missing values and then standardize the dataset. In other words, the
way that seems correct to me is not working.
Any helpful comments on the problems described would be much
appreciated!
Thanks, Jonck
2003 Jun 10
1
SOM random seed
...s it possible to pass the
random-seed as an argument somehow, when choosing the random
initialisation of the lattice?
As it is now, each time I run a SOM on a dataset with the same settings
the resulting SOM will still be slightly different due to the random
initialisation.
Thanks for any help, Jonck
2003 Jun 17
2
Macintosh plots
This may be a dumb question, but I've wasted several hours trying to
find an answer....
When I do a plot with no parameters set eg: ' >plot(d1)' it comes up
with a dark gray background and blue data points. I can modify the
data points using '>plot(d1, col = "red")', but I have not been able to
modify the background color. '>plot(d1, bg =
2003 Jun 27
1
R-help Digest, Vol 4, Issue 27 ( -Reply)
...Brian Ripley)
3. Re: Can't save a graph to pdf in R for MacOS (p.b.pynsent)
4. Re: create help files (Duncan Murdoch)
5. Re: create help files (Uwe Ligges)
6. New web tool (Elio Mineo)
7. Re: Can't save a graph to pdf in R for MacOS (Prof Brian D Ripley)
8. GeneSOM viewer (Jonck van der Kogel)
9. Plots using POSIX (Shawn Way)
10. Re: Plots using POSIX (Prof Brian Ripley)
11. Re: robust regression (l1fit) (Martin Maechler)
12. Bagged clustering and fuzzy c-means (Xu Yun)
13. Message status - undeliverable
(Mailer-Daemon at prv-mx.provo.novell.com)
14. Re:...