Questions tagged [cluster-analysis]
Questions on the cluster analysis functions of Mathematica, including the Hierarchical Clustering Package.
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K-medians clustering computation
Is there a built-in function for data clustering using k-medians algorithm? I found out about the ClusterDissimilarityFunction of the ...
0
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1answer
79 views
map cellular automaton to planar surface
Im exploring possibility to apply a CA to a portion of a region in an image.
Think that I can process an image to identify a region, as an example, a green area.
I would like to confine that area, ...
0
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0answers
30 views
Clustering irregular (x,y) coordinates
I have coordinates of bubbles rising in a fluid (with some horizontal velocity). I need to cluster them by source.
data = data in .nb format
Graphic version of the data containing multiple sources
...
1
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0answers
75 views
Programming a DBSCAN in Mathematica
FindClusters has a built-in Method called "DBSCAN". You can find it on this page:
https://...
2
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0answers
112 views
Adjacency Matrix to Clusters of Equal Sizes
I have a system with 72 nodes.
I have a binary adjacency matrix $S$ of size $72\times 72$. If $S_{i,j}=1$, then node $i$ is adjacent to node $j$. So, we also have $S_{i,j}=S{j,i}$. So, $S$ is a ...
0
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1answer
88 views
How to find clusters with same cluster sizes?
I have a set of 71 data points. Each data point is represented by its latitude and longitude. I want to divide them into 12 clusters. The first 11 cluster will have exactly 6 points each and 12th ...
2
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2answers
124 views
How to form multiple clusters of given size from a set of points?
Let us consider a 2 dimensional space. There are 100 points in it. So, each point has its $x$ and $y$ coordinates. I want to form 10 clusters. Each cluster has 10 points.
How can I form such ...
1
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1answer
65 views
Using Density Histogram on FindCluster
I have some data which I want to put in a DensityHistogram after i have clustered
it. The different clusters should have different colors and based on how many are ...
6
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1answer
115 views
How do we cluster separate curves in a set of data?
Below, I have included some data. (It is long, but I don't like to host data elsewhere and provide links that might some day be broken.)
Plotting this set of data,...
5
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1answer
47 views
ClusteringComponent and FindClusters are returning the wrong number of clusters and are inconsistent
I am trying to find the optimum number of clusters in a correlation matrix.
To do this I run a clustering algorithm that loops through 3 variables ( number of clusters, ...
0
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0answers
26 views
clustering data on a spectrum with a custom distance function
I have recently been faced with a problem on spectral analysis which may find a solution with data clustering techniques. I have an energy spectrum with around 200 energy levels: many of them ...
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0answers
30 views
How to ask FindClusters to return the loss function value in the output?
I have some data points pts as below:-
pts = BlockRandom[SeedRandom[123]; RandomReal[1, {100, 2}]];
Now I want to separate ...
4
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0answers
35 views
What is the default method of FindClusters?
I used Method -> Automatic on FindClusters and obtain a cluster autoCts as below:-
...
5
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0answers
58 views
How to make the clustering result of version 11.2 and 11.3 same?
I was doing clustering analysis in version 11.2, with codes like below, and then got 12 clusters as the output:
...
1
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2answers
62 views
Number of contiguous ones of an element in a 2d binary array
I have a 2d binary array of 0s and 1s. I select an element and would like to know how many 1s are in the contiguous cluster that includes the selected point. If the selected element is 0, the answer ...
7
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2answers
202 views
How to Wrap the Points of a 3D Clustering Plot?
I am doing clustering and have a plot as below:-
...
6
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0answers
63 views
Why does FindClusters put closer points into different clusters?
I am trying to do clustering and then obtained a plot as below:-
...
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0answers
53 views
6
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3answers
146 views
How to know the layout about these points
I have such points
pts=Uncompress[FromCharacterCode[
Flatten[ImageData[Import["http://i.stack.imgur.com/hkAK8.png"],"Byte"]]]];
...
1
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2answers
88 views
How to cluster the elements of a list based on connectivity?
Consider a list (coordpairs) of coordinate pairs as
...
3
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1answer
72 views
Finding the size of connected clusters with specific patterns in an array
I have a $w \times h$ array with either $-1$ or $+1$.
I wish to monitor the size of the largest connected clusters with specific patterns that occur during a Monte Carlo simulation, i.e.,
a ...
1
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0answers
47 views
How does DominantColors work?
I'm trying to understand the algorithms behind DominantColors[]. Unfortunately Trace[] and ...
4
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1answer
51 views
How to specify radius for “MeanShift” Method of FindClusters
I would like to specify the radius used for the "MeanShift" Method of FindClusters. Where ...
0
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1answer
97 views
How to segment an image based on MeanEuclideanDistance?
Consider an image (img) as
Now I have partitioned the image using the following command
parts = ImagePartition[img, 32];
...
6
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0answers
47 views
What method does FindGraphCommunities use with Method -> “Centrality”?
Cross-posted to W Community
I would like to know what method FindGraphCommunities uses with the option Method -> "Centrality"...
3
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0answers
44 views
“Optimize” find clustering by local optimization
There is a method of clustering in Mathematica named "Optimize" which find clustering by local optimization. Here is the ref http://reference.wolfram.com/language/tutorial/PartitioningDataIntoClusters....
2
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0answers
59 views
ClusterClassify and FeatureTypes
I have a dataset that I want to classify in clusters. All values are numbers.
For some variables, the values can represent a real measure (a distance, a weight...) but for some other variables, the ...
0
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1answer
87 views
How to visualize several groups of points?
I have generated a dataset that clustered some of data points into three groups, the output was three -column data like this:
there are some points with X,Y coordinates and I already labeled each of ...
2
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0answers
103 views
1
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0answers
79 views
How can I rotate labels in a Dendrogram when using pre-clustered data?
I have some pre-clustered data that I want to visualize with Dendrogram. I am using Dendrogram purely for visualization in this ...
7
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2answers
127 views
Impact of Linkage and DistanceFunction on Agglomerate clustering
I'm using Agglomerate function to find clusters of my experimental points. I have about 20 points with 10 parameters each. It seems it works fine, but there are plenty of Linkage and DistanceFunction ...
7
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0answers
93 views
FindCluster only finds cluster “with a little help”
Currently I made some slides to illustrate clustering. As an example I made a point set of two clusters:
...
0
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0answers
63 views
How can I improve effect of Clustering of MNIST?
Limit us with Clustering technology, like FindClusters, ClusteringComponents,ClusterClassify,...
5
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2answers
119 views
How to detect the frequency of gene pairings in lists of genetic profiles
We have a list of >1000 gene profiles each consisting typically of 4 genes. Many profiles share pairs of identical genes. Can we derive clusters of profiles which share pairs or even trios of genes? ...
14
votes
4answers
551 views
How to split data into clusters based on fitting to function
I have data which looks somewhat like this:
On the picture, you can see that the data can be described by 2 linear functions - if you manage to split it into 2 groups, each can easily be fitted with <...
0
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0answers
56 views
FindCluster gives same grouping each time in Mathematica 9 and different in 11.1
This is my dataset:
...
3
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2answers
556 views
Plot density of discrete data
I have some discrete data in the form {{x1,y1},{x2,y2},...} and when I produce a ListLogLogPlot they look like this:
I would ...
5
votes
2answers
175 views
Inexplicable results from ClusteringComponents Agglomerate in version 11.1
I have data like this:
data = {5, 12, 18, 19, 20, 23, 24, 26};
On Mathematica 11.1, clustering produces a variable final choice of clusters. For example:
...
4
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1answer
194 views
How to rapidly find the nearest pairs of points in different clusters
Background
For speed up this question or this question,I have such need.
Current try:
Suppose I have $3$ clusters of points:
...
-5
votes
1answer
78 views
Import, DirectAgglomerate, DendogramPlot- why must I execute every command seperately? [closed]
I have a big distance matrix in a file and I want to do clustering and plot dendgoram. I've tried:
...
8
votes
2answers
230 views
FindClusters doesn't accept custom DistanceFunction
Bug introduced in 11.0 and persisting through 11.1.0
I have a problem with using custom DistanceFunction in FindClusters. To make the issue as simple as possible, consider clustering odd & even ...
3
votes
1answer
53 views
Most Computationally Efficient Way To Rejoin Related List Elements?
I am working with a large list of elements, each of which are assigned five values. The first 3 are coordinates, while the remainder are other important properties. I need to cluster these elements ...
0
votes
1answer
159 views
FindClusters versus ClusteringComponents
[Cross-posted on the Wolfram Community.]
I just found out that there's a difference in the number clusters retrieved when using FindClusters and ...
1
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1answer
63 views
Average Clusters of x,y coordinates [closed]
This seems like an easy question but I am a bit rusty with Mathematica. I have a list of x,y coordinates and I would like to average the first number of each group. E.g. The mean of 10,9,and 9. And ...
4
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0answers
93 views
1
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3answers
82 views
Clustering with a certain number of members
Is it possible to find exact number of clusters with exact numbers of members in each cluster?
Something like this:
...
4
votes
1answer
245 views
Dendrogram: control label position and formatting
How can I control the label position and formatting using Dendrogram? I am looking for a way which is also easy to use when passing a clustering tree as input (...
3
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0answers
35 views
“DistanceCombiner” option of Dendrogram – what is it?
Dendrogram has the following non-graphics options:
...
5
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1answer
147 views
Why doesn't Mathematica find the obvious clusters?
I run into this problem when analyzing data with obvious clusters. Why doesn't Mathematica find the four clusters?
...
3
votes
2answers
798 views
Conditional Clustering of a set of 3D points
I have a set of 3D points and I would like to know how to cluster them such that every point in a given cluster is at most a certain distance (let's assume ...
