Community Profile # Shoaibur Rahman

### Baylor College of Medicine

Active since 2014

Specialities: Systems Neuroscience, Machine Learning, Data Science, Statistical Inference, Signal Processing, and Image Processing

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Question

Frequency scaling of audio signals
I have an audio signal x[n], whose frequency varies over time. It's FT is X[k]. I want to reconstruct an audio signal (x_hat[n])...

ongeveer 4 jaar ago | 0 answers | 0

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Question

Inverse Fourier Transformation with a function in the exponent
I have a signal x[n] with it's Fourier Transform X[k]. I want a frequency-warped signal (x_warp[n]) by taking the inverse Fourie...

ongeveer 4 jaar ago | 0 answers | 0

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Question

Shuffling a vector for n times to generate a new vector
A is a vector. I want to shuffle its elements for n times to generate a new vector. For example: A = [3 5 1]; out = [Shu...

ongeveer 7 jaar ago | 1 answer | 0

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Question

Generating a long vector from two other vectors
I got stuck with a (may be) simple problem. Here are two vectors, like: a = [20 13 24 ...]; b = [3 2 4 ...]; How can ...

ongeveer 7 jaar ago | 2 answers | 0

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Receiving Matrix Dimensions Do Not Agree Error
Instead of Y use Y transpose as Y' in the last line of your code. X=inv(A)*Y' However if you use the following line inst...

meer dan 7 jaar ago | 2

| accepted

How to delete a row from a Financial Time Series?
This works here, delete rows 2 from 4: A = [1 2 3; 4 5 6; 7 8 9; 2 4 6; 1 3 5]; A(2:4,:)=[] When using your code, do ...

meer dan 7 jaar ago | 1

About 3D surface plot
a = ...your 100 x 1 x 51 data; bb = squeeze(a); surf(bb)

meer dan 7 jaar ago | 2

| accepted

Bump --> How to change tick label fonts in Matlab figure
Here is an example on how you could use set function to accomplish your job. Delete any pairs of input arguments if not required...

meer dan 7 jaar ago | 1

| accepted

how to convert an image into bits???
It is not clear to me exactly what is your goal? Are you trying to convert image pixels into binary bits? If so, you can use dec...

meer dan 7 jaar ago | 2

Save cubic spline coefficients to use as response in regression
pp = spline(x,y); NewValue = [1 2]; % may be scaler or vector out = ppval(pp,NewValue)

meer dan 7 jaar ago | 1

Find a value with cell array.
A = your cell... out = A(cell2mat(A(:,1))==7,2)

meer dan 7 jaar ago | 1

how to calculate a serie of a function with two variables
% xi eta x =[1 2;... 3 4;... 4 5;... 6 7]; y = sum(x) % only sum of all elements alon...

meer dan 7 jaar ago | 1

How can I fill a matrix column with dta coming from another matrix according to index
A = [(1:9)' ones(9,1)]; B = [1 10; 2 10; 4 10; 7 10]; C = NaN(size(A,1),1); C(B(:,1)) = B(:,2); C = [A C]

meer dan 7 jaar ago | 1

how to find peaks in jpeg image
You can try with Mablab's findpeaks function, or see the attached code in file exchange: <http://www.mathworks.com/matlabcent...

meer dan 7 jaar ago | 1

I need to match following images
There are many sophisticated methods to do so. However, you can try with: out = ssim(TestImage,refImage) This computes t...

meer dan 7 jaar ago | 1

| accepted

How to check two unbalanced matrix?
Another way may be: X=[1;2;3;4;5]; Y=; Z = X(X==Y)

meer dan 7 jaar ago | 1

how to crop an image
I don't see any image attached. Anyway, you can try with: *roipoly* to select the image region and crop manually, or *imcrop...

meer dan 7 jaar ago | 1

how can i display a gray scale image instead of mapping 0,255 , between 0 , 127 ?
NewImage = 127*mat2gray(Image)

meer dan 7 jaar ago | 1

A simple fsolve problem from a MATLAB beginner
Define underwoodroot function separately, and call them from another m-file. In one m-file, write the following code, and sav...

meer dan 7 jaar ago | 1

| accepted

How can convert a image from type of double(unit16) to a grayscale image?
ImageGray = mat2gray(ImageDouble);

meer dan 7 jaar ago | 1

how can i find a fuction which define input and output of a system?
Use: p = polyfit(x,y,n) % n is degree of polynomial, use a value that best fit your data To check the fitting: y_fi...

meer dan 7 jaar ago | 2

| accepted

How to concatenate several matrices into one matrix?
Perhaps, you mistyped. It is C = [A; B] for different number of rows, but similar number of columns. Anyway, how your matrices a...

meer dan 7 jaar ago | 3

| accepted

Multi level sorting and filtering
[~, ~, D] = xlsread('Multilevel_sorting.xlsx'); A = D(3:end,1:2); % your data in table 1 G = {'Group1','Group2','Gro...

meer dan 7 jaar ago | 1

Acceleration vs Time data into FFT
Define the number of DFT points N, and then perform the fft. N = pow2(nextpow2(length(signal))); y = fft(signal,N); ...

meer dan 7 jaar ago | 1

Recode strings in Cell array
indx = 0; for k = 1:size(codes,1) if strcmp(codes(k,1),'Home') && strcmp(codes(k,2),'5') indx = indx+1; ...

meer dan 7 jaar ago | 1

| accepted

Solving system of nonlinear euations
syms x y [x,y] = vpasolve(x^2 + y^3 == 1, 2*x + 3*y == 4, x,y)

meer dan 7 jaar ago | 1

| accepted

manually draw shapes (like using a pencil to draw on figure) on opened image
Try: roipoly

meer dan 7 jaar ago | 1

| accepted

How Can I Assign variable Name?
x = 1:5; eval([datestr(date,'mmmm_dd_yyyy') '= x']); x is stored in a new variable named based on today's date. If you r...

meer dan 7 jaar ago | 1

Compound Poisson Distribution Model
I am not sure if I understand your question correctly. I guess once you get P, then you would like to choose its elements random...

meer dan 7 jaar ago | 1

| accepted