Community Profile # PChoppala

### UNSw

Active since 2011

My research interests include Bayesian statistics, spatial modelling, machine learning, stochastic signal processing and particle filtering.

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Question

covariance of weighted multidimensional samples
I have a multidimensional weighted sample set, e.g. D=2; % dimension N=100; % number of samples x=randn(D,N); % samples ...

6 years ago | 0 answers | 0

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Question

sampling from a normal distribution
I usually generate a sample from a normal distribution N(mu,sigmasq) (where mu is the mean and sigmasq is the variance) as follo...

6 years ago | 0 answers | 0

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Define a matrix A of dimension 2*4 whose (i , j) entry is A(i , j)=i+j
[P1,P2]=meshgrid(1:4,1:2) result=P1+P2

6 years ago | 0

I can't put two lines in one legend on matlab in my plot
string1 = 'xyz'; string2 = 'abc'; value=3.14; sprintf('%.2f %s %s \n %s',value,string1,string2,string2)

6 years ago | 0

Problem with legend in a plot
An example (although there are better ways of doing it), n=50; x=linspace(1/n,1,n); y1=sin(4*pi*x); y2=cos(4*pi*x(10:3...

6 years ago | 0

object detection from frames
This is not a MATLAB specific question. Look here <http://au.mathworks.com/discovery/object-recognition.html> or try machine lea...

6 years ago | 0

Question

accessing elements inside cell arrays
I am not a great user of cell arrays and haven't found my answer precisely on other links, hence the question. I have a cell arr...

6 years ago | 1 answer | 0

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Question

Color coding commented statements and comments following a statement
Hi, I would like to know if there is a possibility of having a different color for a commented statement and a comment that ...

6 years ago | 3 answers | 5

### 3

Question

plotting with different colors
Hi, I have to plot something like x=0.1:0.1:1; n=length(x); f=exp(x); y=f+0.1*randn(1,n); figure ...

6 years ago | 1 answer | 0

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Question

Bar plot with a single bar across multiple x-axis values
I need to plot a single horizontal bar across multiple x-axis values, e.g., y=[2 1 3]; bar(1:6,y(1),'c', 2:5,y(2)...

7 years ago | 1 answer | 0

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Question

using rand to generate numbers
Hi I have a simple question. I understand that both a and b vectors (please see below) will generate 5 random numbers from 0 ...

8 years ago | 2 answers | 0

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Question

cdf of multivariate normal random numbers
Hi I want to find the cdf of a set of 1000 bivariate normal random numbers that are generated by X=mvnrnd([3,12],[1,.2;....

9 years ago | 1 answer | 0

### 1

Question

finding the starting points of the steps in a staircase like function
Hi I will appreciate help on this problem: I generate a vector C from a set of weighted samples (you can see in the figure...

9 years ago | 1 answer | 0

### 1

Question

Sharing the values between vectors
Hi I will appreciate your support on this: I have a 3 x 9 matrix f with some finite and non-finite values. I have to manip...

9 years ago | 1 answer | 0

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Question

integrating the product of two pdf's
Hi I have a small query, and will appreciate your help. I am supposed to find the integral of the product of two probabil...

9 years ago | 2 answers | 0

### 2

Question

bimodal Gaussian distribution function
Hi Greetings. I have a simple problem and will appreciate your help. I am trying to plot the bimodal Gaussian distribution...

9 years ago | 2 answers | 0

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Question

filter, decay, delayed versions
Hello everyone, I need advice on a simple query. I need a FIR filter which has decay time specified by me. The filter...

9 years ago | 1 answer | 0

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Question

finding multiple maxima in a Gaussian distribution
Hi I have a query and will appreciate your help. If we try the code below, >> c1=1; >> for p=-50:50 c2=1; fo...

10 years ago | 2 answers | 0

### 2

Question

round, randn
Hello Simple query. Suppose I assign y=randn(4,1), I get a 4X1 matrix with random numbers which have (may be) 3-4 number a...

10 years ago | 1 answer | 0

### 1

Question

reverberation in matlab
Hi I have a broadband signal x(t) as x = randn(1,100); Fs = 48e3; Do we have any inbuilt function or a standard procedur...

10 years ago | 0 answers | 0

### 0

Question

surf, plotting, axis
Hi Simple question.... I have an output 'P' which is a 10X10 matrix. I start with for i=1:10 for j=1:10 P...

10 years ago | 1 answer | 0

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Question

fft
Hi Just an urgent but simple question. I have a signal s = randn(1,100), with Fs = 48e3 Hz. I want to add a delay of 1.3ms...

10 years ago | 0 answers | 0

### 0

Question

upsampling and adding delay to a sequence
Hi I have a simple query. Suppose i have a signal s = randn(1,10), if I want to add delay 100ms to this signal, what sho...

10 years ago | 1 answer | 0

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Question

Hi Another simple question with regard to my last question on broadband signal delay. Can we treat t=0:1/100:1 s=sin(2*...

10 years ago | 0 answers | 0

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Question

how to add delay to a signal
Hi I have a small query. Can you help me to add delay to a signal s=randn(1,100); But the delay is given in time domain, ...

10 years ago | 3 answers | 1

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Question

Hi there For my simulations, I need to generate a broadband signal s(t). Also, at a later stage, I need s(t-D),(I will sep...

10 years ago | 0 answers | 0

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Question

mathematical expectation
Hi Suppose we have a vector X=[1 2 -1 5 2], I want the mathematical expectation E{x*x'}, can you please help me with that sta...

10 years ago | 2 answers | 0

### 2

Question

randn, awgn, wgn
Hi I have a small doubt. Is a = awgn(randn(20,20), 6.7) and a = wgn(20,20,6.7) the same Aim is, I want a 20X20 fram...

10 years ago | 1 answer | 0

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Question

secons max number in a vector
Hi I need to find maximum and second maximum number in a vector. Can you please help? For max, its max(X), but for second max...

10 years ago | 1 answer | 0