Displaying 20 results from an estimated 10000 matches similar to: "hclust.identify problem"
2011 Sep 13
2
help with hclust and cutree
Hello,
I would like to cut a hclust tree into several groups at a specific
similarity. I assume this can be achieved by specifying the "h" argument
with the specified similarity, e.g.:
clust<-hclust(dist,"average")
cut<-cutree(clust,h=0.65)
Now, I would like to draw rectangles around the branches of the
dendrogram highlighting the corresponding clusters, as is done by
2011 Sep 16
1
cutree() and rect.hclust(): different labelling of classes
I've found that while cutree() and rect.hclust() make the same classes
for a given height in the dendrogram, the actual labeling of the classes
is different. For example, both produce the same 4 classes but
class 1 according to cutree() is class 4 according to rect.hclust().
Would it be possible that future versions provide the same labeling?
rect.hclust() is useful to display the classes
2012 Oct 11
2
extracting groups from hclust() for a very large matrix
Hello,
I'm having trouble figuring out how to see resulting groups (clusters)
from my hclust() output. I have a very large matrix of 4371 plots and 29
species, so simply looking at the graph is impossible. There must be a
way to 'print' the results to a table that shows which plots were in
what group, correct?
I've attached the matrix I'm working with (the whole thing
2012 Jul 10
1
identify.hclust() doesn't cut tree at the vertical position of the mouse pointer
Dear All
According to the identify.hclust documentation the function "cuts the tree at the vertical position of the pointer and highlights the cluster containing the horizontal position of the pointer".
When I carry out this, the tree isn't cut where I click - in fact, there seems to be a limit below which I cannot go.
Consider the following code:
mat <- matrix(rnorm(5000),
2004 Apr 05
1
rect.hclust fails when k is specified (PR#6740)
Full_Name: Ivan Egorov
Version: 1.8.1
OS: MS Windows 2000, SP4
Submission from: (NULL) (194.186.91.129)
V<-t(matrix(scan('C:/V3.dat'),3))
d<-dist(V)
hc<-hclust(d)
rect.hclust(hc,5)
Error message is displayed:
Read 24 items
Error in rect(m[which[n]] + 0.66, par("usr")[3], m[which[n] + 1] + 0.33, :
plot.new has not been called yet
Here's my data file
2004 May 10
3
Colouring hclust() trees
I have a data set with 6 variables and 251 cases.
The people who supplied me with this data set believe that it falls
naturally into three groups, and have given me a rule for determining
group number from these 6 variables.
If I do
scaled.stuff <- scale(stuff, TRUE, c(...the design ranges...))
stuff.dist <- dist(scaled.stuff)
stuff.hc <- hclust(stuff.dist)
2005 Jul 06
1
Help: Mahalanobis distances between 'Species' from iris
Dear R list,
I'm trying to calculate Mahalanobis distances for 'Species' of 'iris' data
as obtained below:
Squared Distance to Species From Species:
Setosa Versicolor Virginica
Setosa 0 89.86419 179.38471
Versicolor 89.86419 0 17.20107
Virginica 179.38471 17.20107 0
This distances above were obtained with proc
2006 Mar 09
1
Identifying or searching for labels in a hclust/dendrogram/heatmap
Hi
Sorry if this is in the help :-S
I've looked at example(dendrogram) and though it gives some indication of what I want, it doesn't do all.
OK, so here is what I want to do: draw a tree, and then have an action, on user-click, to either draw a sub tree or a plot of the data. I also want users to be able to search for a particular label and have it highlighted on the tree, say in
2005 Jul 08
5
Help with Mahalanobis
Dear R list,
I'm trying to calculate Mahalanobis distances for 'Species' of 'iris' data
as obtained below:
Squared Distance to Species From Species:
Setosa Versicolor Virginica
Setosa 0 89.86419 179.38471
Versicolor 89.86419 0 17.20107
Virginica 179.38471 17.20107 0
These distances were obtained with proc 'CANDISC'
2002 Feb 20
1
plot.hclust: strange behaviour with "manufactured" hclust object
I've been trying to get plot.hclust to work with a hclust object I
created and have not had much success. It seems that there is some
"hidden" characteristic of a hclust object that I can't see. This is
most easily seen in the following example, where plot.hclust works on
one object, but when this object is "dumped" and then re-read,
plot.hclust no longer works. Is
2010 Aug 09
1
Need help on heatmap, K-means and hhierarchical clustering methods
Hi folks,
I am new to the R software. I have been going through different materials to
know more about R.
I have the R software installed on my windows machine.I would like to know
the R source code for the following problems on iris flower data set.
I need to do the cluster analysis project with the iris data set. The goal
is to cluster the flowers
according to their Sepal.Length, Sepal.Width,
2011 Sep 02
2
How to keep the same class?
Hello
Please see the example below
> class(testX)
[1] "matrix"
> class(testX[1,])
[1] "numeric"
Why not matrix? What am I missing here? Is there a way to keep the same
class?
The reason for the question is that I want to implement a k-step ahead
prediction for my own routines and R wrecks does not seem to like [1,] as
shown below.
>
2012 May 24
4
Manually modifying an hclust dendrogram to remove singletons
Dear R-Help,
I have a clustering problem with hclust that I hope someone can help
me with. Consider the classic hclust example:
hc <- hclust(dist(USArrests), "ave")
plot(hc)
I would like to cut the tree up in such a way so as to avoid small
clusters, so that we get a minimum number of items in each cluster,
and therefore avoid singletons. e.g. in this example, you can see
2010 Dec 27
1
Any functions to manipulate (merge, cut, remove) hclust objects? (maybe through phylo?)
Hello all,
I'm now working with hclust objects and was hoping to perform some basic
editing on them like:
- Joining = the merging of two hclust objects (so they will share one
root)
- Splicing = So to cut/extract a branch out of an hclust object - that by
itself will be an hclust object.
I noticed I could extract one element of an hclust object by turning it into
a dendrogram,
2004 Dec 15
1
hclust and heatmap - slightly different dendrograms?
Good afternoon,
I ran heatmap and hclust on the same matrix x (strictly, I ran
heatmap(x), and hclust(dist(t(x))), and realized that the two
dendrograms were slightly different, in that the left-right
arrangement of one pair of subclusters (columns) was reversed in the
two functions (but all individual columns were grouped correctly).
Looking through the code for heatmap as a most definite
2003 Nov 04
1
hclust doesn't return merge details [Solved]
Thanks to Andy and Thomas,
Reading help(hclust) more carefully would have done it but sometimes you do not
see the wood for the trees...
So hc$merge does exactly what I want.
I have never been aware of the command str to get the structure of an R-object. It
seems pretty useful to me.
Thanks,
Arne
> -----Original Message-----
> From: Liaw, Andy [mailto:andy_liaw at merck.com]
>
2009 Apr 03
0
dendrogram rect.hclust() not working?
I have tried to use rect.hclust() to draw a rectangle around a set of
leaves, but am running into trouble.
The rect.hclust() is drawing two rects instead of one, and of the
wrong size:
--------------------
scoreClusterObj <- hclust(scoreDistanceObj, method=clustMethod)
order <- scoreClusterObj$order
orderedLabels <- rep(0, length(order))
for (orderIndex in 1:length(order)) {
# this
2012 Jul 04
1
Error in hclust?
Dear R users,
I have noted a difference in the merge distances given by hclust using
centroid method.
For the following data:
x<-c(1009.9,1012.5,1011.1,1011.8,1009.3,1010.6)
and using Euclidean distance, hclust using centroid method gives the
following results:
> x.dist<-dist(x)
> x.aah<-hclust(x.dist,method="centroid")
> x.aah$merge
[,1] [,2]
[1,] -3 -6
2011 Mar 05
1
pvclust crashing R on Ubuntu 10.10
Hi all
I am writing to you with a question regarding the pvclust package. And
yes, before the usual people produce their usual
contact-the-package-maintainers line, ye, I tried that but the emails
one can find on the web either bounce or are not responded to. Also,
yes, this error has already been reported as a bug but been shot down
as not reproducible
2011 Feb 07
1
Creating a list of lists / hclust elements
Dear group,
I am currently struggling with the following problem for a while:
I want to create a list whose elements consists of lists themselves.
More concise: The list elements are HCLUST objects. However, when I
try to append the HCLUST objects to my list via:
cluster_list <- append(cluster_list, HCLUSTobject)
the HCLUST object is appended - but not as an object but as its
components. So