# DEVANAND

### The Institute of Mathematical Sciences, Chennai

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Question

Visualizing an aggregation pattern properly?

So my program is giving me an aggregation pattern output whose video is available <https://www.youtube.com/watch?v=qujmGZCtj6k&f...

9 years ago | 0 answers | 0

### 0

answersQuestion

Lagrange interpolation for 2D inputs like images?

Hi everyone. Do any one has code or link for lagrange interpolator in matlab for 2D data ( like for image interpolation etc ). T...

9 years ago | 0 answers | 1

### 0

answersQuestion

Can someone help vectorize this loop?

Hi, Can this code be vectorized. If so, can someone help me to do so. Thanks in advance. C is a 201*201 2D matrix. ...

9 years ago | 1 answer | 0

### 1

answerQuestion

How to generate a second order markov chain?

I have 27 symbols (numbers 1 to 27) and a probability transition matrix of size 729*27 for generating a second order markov chai...

9 years ago | 0 answers | 1

### 0

answersQuestion

How to make this long if-else chain compact?

I am trying to generate a markov chain based text generator of 2nd order. As a first step, I did a zeroth order Markov chain.But...

9 years ago | 1 answer | 0

### 1

answerHow to query for all the nitrogen coordinates in pdb file?

pdb1 ='/home/devanandt/Documents/VMD/1UBQ.pdb'; x=pdbread(pdb1); atom={x.Model.Atom.AtomName}; n_i=find(strcmp(at...

9 years ago | 1

| accepted

Question

How to query for all the nitrogen coordinates in pdb file?

0 down vote favorite I was trying to extract Nitrogen coordinates from ubiquitin protein. I have the 1UBQ.pdb file from h...

9 years ago | 1 answer | 0

### 1

answerQuestion

How to modify my 1D random walk sequence to a reflecting type random walk?

I have a sequence 'x' generated as below (for simulating 1D random walk): r=rand(1,1000); r(r>.5)=1; r(r<=.5)=-1; ...

10 years ago | 1 answer | 0

### 1

answerQuestion

How to extract the vein pattern from an IR image of finger?

I am trying to isolate (or segment to be precise) the vein pattern from Infra red image of a finger (using MATLAB) like shown ...

10 years ago | 2 answers | 0

### 2

answersHow to write this cell to a csvfile?

OK I did it. This is how I did: fid = fopen('junk.csv','w'); fprintf(fid,'%s,%s\n',xx{1,:}); % cell name xx with 4*2 ele...

10 years ago | 0

Question

How to write this cell to a csvfile?

Hi all, If I have a cell with contents like {'X','Y'; 1,'a'; 2,'c'; 3,'c'} Now I want to convert this cell to...

10 years ago | 1 answer | 0

### 1

answerQuestion

How to efficiently write an alternate code for the below given code?

I have a piece of code, which reads 100000 images, convert it to grayscale and find the histogram of each and finally concatenat...

10 years ago | 1 answer | 0

### 1

answerQuestion

How can I read huge amount of image files and take the corresponding histogram data to a matrix in order?

Hi all, Suppose I have a database of 100000 image files (the names of files are numbers 1.jpg to 100000.jpg) . I want to compute...

10 years ago | 3 answers | 0

### 3

answersQuestion

Doubt on Covariance matrix of 3 vectors in MATLAB

Hi all, The covariance matrix of 3 vectors x y and z is defined by cov_matrix(x,y,z) =[var(x) cov(x,y) cov(x,z); ...

11 years ago | 2 answers | 0

### 2

answersQuestion

How to realize this vector operation ?

I have a vector X and 5 states (each state is a vector like A B C D E as below). A = [10 11 12]; B = [20 25]; C = [37 ...

11 years ago | 2 answers | 0

### 2

answersSolved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

12 years ago

Question

I have a n symbols and a conditional probability matrix, how do I generate an output sequence from this n symbols using their respective conditional probability?

Hi all, I have a n symbols and a conditional probability matrix, how do I generate an output sequence from this n symbols usi...

12 years ago | 0 answers | 0