# Shoaibur Rahman

### Baylor College of Medicine

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

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**Content Feed**

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])...

4 years ago | 0 answers | 0

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answersQuestion

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...

4 years ago | 0 answers | 0

### 0

answersQuestion

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...

7 years ago | 1 answer | 0

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answerQuestion

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 ...

7 years ago | 2 answers | 0

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answersReceiving 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...

7 years 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 ...

7 years ago | 1

About 3D surface plot

a = ...your 100 x 1 x 51 data; bb = squeeze(a); surf(bb)

7 years 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...

7 years ago | 1

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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...

7 years 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)

7 years ago | 1

Find a value with cell array.

A = your cell... out = A(cell2mat(A(:,1))==7,2)

7 years 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...

7 years 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]

7 years 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...

7 years 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...

7 years ago | 1

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How to check two unbalanced matrix?

Another way may be: X=[1;2;3;4;5]; Y=[2]; Z = X(X==Y)

7 years 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...

7 years ago | 1

how can i display a gray scale image instead of mapping 0,255 , between 0 , 127 ?

NewImage = 127*mat2gray(Image)

7 years 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...

7 years ago | 1

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How can convert a image from type of double(unit16) to a grayscale image?

ImageGray = mat2gray(ImageDouble);

7 years 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...

7 years 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...

7 years 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...

7 years 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); ...

7 years 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; ...

7 years ago | 1

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Solving system of nonlinear euations

syms x y [x,y] = vpasolve(x^2 + y^3 == 1, 2*x + 3*y == 4, x,y)

7 years ago | 1

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

Try: roipoly

7 years ago | 1

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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...

7 years 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...

7 years ago | 1

| accepted

How is this an exponential curve?

Convert your difference equation into differential equation: y(i+1) = y(i)-y(i)*h; y(i+1) - y(i) = -y(i)*h; (y(i+1) -...

7 years ago | 1

| accepted