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liangjian


Active since 2011

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why LIBSVM runs so slowly for 0/1-based feature matrix
I am using Libsvm to perform text classification tasks. I normally uses binary occurrence, TF/IDF to build feature set for the i...

9 years ago | 0 answers | 0

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answers

Question


Urgent help, how to plot two groups of data and mark them with different color using MDSCALE?
I have two groups of data, e.g., A and B. Both of these data groups are of high-dimensions, 10. A group has about 100 points and...

10 years ago | 0 answers | 0

0

answers

Question


different result is obtained for the same input using self-organizing map
I used Neural Network Toolbox to train a self-organizing map for a given data set. I found that each run gave me a quite differe...

10 years ago | 1 answer | 0

1

answer

Question


Regarding the size of matrix that Matlab can handle
How big matrix that matlab can handle? In my project, the program may need to generate and operate on a matrix with size of 5000...

10 years ago | 3 answers | 0

3

answers

Question


how to improve the resolution of generated eps file
I generate a dendrogram plot with a lot of leaf node. It become quite difficult to read the node label on the saved eps file. ...

10 years ago | 1 answer | 0

1

answer

Question


extract clusters based on the dendrogram
In the generated dendrogram graph, the column marks the distance cutoff. Is there a way to get the cluster information for each ...

10 years ago | 0 answers | 0

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answers

Question


Regarding the returned vector of dendrogram function
I am drawing dendrogram using matlab function like the following [h1,t1,perm1] = dendrogram(z,3); According to MATLAB docu...

10 years ago | 1 answer | 1

1

answer

Question


how to use regular expression to remove a prefix string with all 0s.
I have a set of strings, some of them are prefixed with 0, and others are not. For instance, there have five strings: 012AB...

10 years ago | 1 answer | 0

1

answer

Question


about saving the numerical value and string altogether
I have a string matrix with N rows and 2 columns. Each cell stores a string. I have another N*1 vector, where each entry is a nu...

10 years ago | 1 answer | 0

1

answer

Question


regarding storage issues for mixed-type value matrix
There has a loop in my program, and during each iteration an ID will be generated. I want to store these IDs into a two dimensio...

10 years ago | 2 answers | 0

2

answers

Question


problem of using patternnet in Neural network toolbox
I use the pattern recognition network (patternnet) to train a set of data, whose dimension is 7100 and there have 2000 data poin...

10 years ago | 1 answer | 0

1

answer

Question


how to set the number of hidden neurons in the neural network toolbox
I am trying to use the feedforward neural network to cluster a set of data. The network architecture design requires to set the ...

10 years ago | 1 answer | 0

1

answer

Question


supervised training of SOM in MATLAB
I have a labelled data set, each data entry is of six dimensional. Each data entry is pre-labelled as belonging to one of 10 clu...

10 years ago | 2 answers | 0

2

answers

Question


Is there an elegant way to create dynamic array in MATLAB?
Is there an elegant way to create dynamic array in MATLAB? For instance, my program has a loop, as program iterates over the ...

10 years ago | 4 answers | 1

4

answers

Question


The function for determining the position of a given value in an array.
I have an array storing numerical values, I know the last part of this array are all zero values. How can I find the starting po...

10 years ago | 1 answer | 0

1

answer

Question


How to load a specially formatted data file into matlab?
I need to load a data file, test.dat, into Matlab. The contents of data file are like *a682 1233~0.2 *a2345 233~0.8 345~0.2...

10 years ago | 1 answer | 0

1

answer