Hi all,
I was wondering 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
Hi all,
Recently I have written a small application, SOMviewer, that is able to
graphically display a self organizing map produced with the som
algorithm found in the GeneSOM package, clustered by any hierarchical
clustering method that produces a merge matrix (agnes, diana, hclust
etc..).
Hi Ian,
Not 100% sure on this, but I've recently been wrestling with producing
plots in R and I think I know the answer to your question. As far as I
could tell, all the parameters for graphics are stored using par().
There is a parameter $bg, which for me is set to transparent, but
I'll bet
Hi all,
I am running a series of experiments where after manipulating my data I
run several clustering algorithms (agnes, diana and a clustering method
of my own) on the data. I wanted to determine which clustering method
did the best job, so therefore I had defined my own quality measure
Hi,
Maybe I'm not understanding you correctly, but wouldn't the following
be the fastest way to compute the sum of a column:
x - matrix(c(1:4462), nrow=4462, ncol=1) #setting up a column of
4462 elements to be able to make a comparison
sum(x[,1])
[1] 9956953
system.time(sum(x[,1]))
[1] 0 0 0
Hi all,
A short while ago I asked a question about multiple imputation and I
got several helpful replies, thanks! I have untill now tried to use the
packages mice and norm but both give me errors however.
mice does not even run to start with and gives me the following error
right away:
iter
Hi all,
I'm currently working with a dataset that has quite a few missing
values and after some investigation I figured that multiple imputation
is probably the best solution to handle the missing data in my case. I
found several references to functions in S-Plus that perform multiple
Hi all,
I have (yet another) question about a function in R. What I would like
to do is test for the presence of a certain value in a vector, and have
the positions that this value is at returned to me.
For example, let's say I have a vector:
x - c(1,1,2,2,3,3,4,4)
Now I would like a function
Hi all,
I am having a bit of trouble with the array structure of R. What I want
to do is dynamically add/remove elements to an array. For example:
Let's say I have created an array:
myArray - array(c(3,8), dim=c(1,2))
myArray
[,1] [,2]
[1,]38
And I now want to, for example, push
