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Active since 2011

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element wise concatenation of square matrices
This is what I wanted. A=magic(3); B=magic(3); C = arrayfun(@(x) [num2str(A(x)) ' ' num2str(B(x))],1:numel(A), 'un...

11 years ago | 0

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element wise concatenation of square matrices
Hi, I have the following two square matrices: A= 17 24 1 23 65 7 4 6 13 ...

11 years ago | 4 answers | 0

4

Question

Hello, I have a small question on FFT based adaptive beamforming based on Spectral Matrix Inversion technique. I have est...

12 years ago | 3 answers | 0

3

Question

relation between the fft of full and segmented signal
Hello, Suppose I the following signal of 10s: fs=1e4; t_duration=10; % duration of signal (seconds) t = 0:1/fs:t...

12 years ago | 1 answer | 0

1

Question

extract a thin band of frequencies from entire spectrum using FFT
Hello, I have following program: fs=1e4; x=randn(1,1e4); %gaussian dist random signal x_fft=fft(x); %fft of the si...

12 years ago | 2 answers | 0

2

Question

values in falling in each histogram bin
Hello, sig=randn(1,440); %random data set bin1=round(1+log2(size(sig,2))); %optimal number of bins edges = linsp...

12 years ago | 1 answer | 0

1

Question

moving a histogram to correct skewness
I have the following histogram: <<http://i50.tinypic.com/2j0k29j.png>> If _x_ is a vector containing my dataset, k=sk...

12 years ago | 2 answers | 0

2

Question

Changing the unknown variable in a matlab line
I have the following line in matlab: y=sum(bin(xout>xout(1) & xout < -lim)); In the above line, Iam computing the value ...

12 years ago | 2 answers | 0

2

Question

Steepness of a Histogram
I have following two histograms: <http://i48.tinypic.com/vso185.png> The Histogram-1 is more spread out as compared to His...

12 years ago | 3 answers | 0

3

Question

divide area under Histogram
Hello, I have the following histogram (normalised to maximum frequency) as shown: <http://i49.tinypic.com/313hj40.png> ...

12 years ago | 1 answer | 0

1

Question

Extract values from Histogram
Hello, How can I extract the elements from certain bins in a Histogram (save in a row vector), so that I can use them for thr...

12 years ago | 1 answer | 0

1

Question

inverse CWT using coif4
Hello, I have an ECG signal _s(t)_ to be analysed using *'coif4'* mother wavelet. My scales are linear from 1 to 10. For each...

12 years ago | 2 answers | 0

2

Question

numerical operation
Suppose I have two 3.6 and 10.75. 10.75 is not divisible by 3.6 but 10.80 is perfectly divisible (difference being 0.05). ...

12 years ago | 1 answer | 0

1

Question

x-coordinate of peaks in 1D plot
Hello, I have the following 1D plot: http://i46.tinypic.com/35clydu.jpg I want to find all the x-coordinate values of t...

12 years ago | 2 answers | 0

2

Question

Uncorrelated sinuoids
How can I create two uncorrelated sinusoidal signals of same frequency (say 900Hz)? f1=900; %frequency in Hertz t_durati...

12 years ago | 2 answers | 0

2

Question

covariance matrix estimation in MVDR beamforming
Iam working on Minimum Variance Distortionless beamforming in frequency domain. I have 8 microphones in a spiral shape with ...

12 years ago | 1 answer | 0

1

Question

band pass filter a signal using FFT
I have a random signal containing frequencies from 1Hz to 1000Hz (as viewed on a spectrogram). I want to extract the signal c...

12 years ago | 3 answers | 0

3

Question

creating mxn matrix from mxnxp matrix [without jumbling elements]
I have a matrix _A(60x100x6)_. I want to place the matrix from each of the 6th index one below the other to have _B(360x100)_....

12 years ago | 1 answer | 0

1

Question

adding same variables to single .mat file
Hello, I have 30 .mat files [data_1,data_2...data_30] containing same variable _x_ with different values (row vectors) each o...

12 years ago | 1 answer | 0

1

Question

saving variables in a single .mat file
Hello, I have 360 .mat files containing same variable _in_ with different data (row vectors) each of size _in(1x3800000)_ sto...

12 years ago | 3 answers | 0

3

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append/save same variable with updated values into .mat file(row-wise)
What is the syntax for appending same variable with different values to an existing .mat file? When I use -append, I end up repl...

12 years ago | 5 answers | 2

5

Question

append rows to same .mat file (without replacing)
What is the syntax for appending values to a existing .mat file? When I use _-append_, I end up replacing the values! Examp...

12 years ago | 1 answer | 0

1

Question

read and write data from .mat file
I have a .mat file containing matrix of size 8x3800000. I need to read 8x980 matrix twice at a time, process it(overlap add t...

12 years ago | 1 answer | 0

1

Question

difference between FFT(X) and FFT(X,N)
Hello, I have the following: clc clear all close all Fs=1000; T = 1/Fs; % Sample time...

12 years ago | 1 answer | 0

1

Question

cross correlation mismatch
I am facing a strange situation. I have a signal _x_ (sum of sines and cosines) of length 50000 samples. One hand, I delay it ...

12 years ago | 0 answers | 0

0

Question

delay random signal using FFT
This doubt has been pinching me since long. Please help me. I have done the following: clc clear all d= 0.000875564...

12 years ago | 0 answers | 0

0

Question

saving a value and reseting other variables in a loop
I have the following situation: for d=1:numel(Time_delay) % time delay is a (8x1000) matrix if rem(d,8)==0; mic...

12 years ago | 1 answer | 0

1

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saving values without index
%***question updated***% I have the following situation:- for d=1:numel(Time_delay) % time delay is (8x1000)...

12 years ago | 2 answers | 0

2

Question

random signal delay
clc clear all close all fs=10000; % sampling frequency in Hz f1=500; % frequency of signal in Hz f2=2...

12 years ago | 2 answers | 0