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Ameer Hamza


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Hong Kong Polytechnic University

3,276 total contributions since 2016

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Answered
How to randomly select 2 rows
You can use the output of randperm as index M = rand(10, 5); % random matrix rows = randperm(size(M,1), 2) M_new = M(rows, :)...

1 hour ago | 1

Answered
how to export value of a Variable vector to dedicated coulmn in UITable app designer
The correct solution depends on how you initialized the Data property of UITable and how did you define T. But my guess is that ...

3 hours ago | 0

Answered
Division of two matrices
mrdivide: http://xl48.cn/help/fixedpoint/ref/embedded.fi.mrdivide.html B = C/A

4 hours ago | 0

Answered
calculation of eigenvalues and eigenvectors
See eig(): http://xl48.cn/help/matlab/ref/eig.html. Normal eigenvalue assumes to be one along the diagonal. You will ...

5 hours ago | 0

Answered
how to plot given plane in matlab (It will be 3d)
A simple solution is to use fimplicit3 f = @(x, y, z) 4.7243+1.1351*x + 3.1351*z - y; fimplicit3(f); An alternative solution ...

6 hours ago | 0

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Answered
Extract non-zero cells from array (of non-uniform vectors)
isempty() with cellfun() will work datas=cell(20,5); datas{15,2}=[1 0 1 0 1]; datas{7,3}=[1 0 1 ]; datas{5,5}=[1 0 1 0 1 1 1...

7 hours ago | 1

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Answered
How to include text in a running figure
Something like this t = linspace(0, 2*pi); y = sin(t); ax = axes(); ax.XLim = [0 2*pi]; ax.YLim = [-1.5 1.5]; hold(ax); ...

10 hours ago | 0

Answered
How can i take ds/dx and ds/dy of a function numerically
The numerical gradient can not be exactly equal to the analytical gradient, except in very simple cases. For any nonlinear funct...

22 hours ago | 0

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Answered
How to find values in structure?
Like this MyRegionFirstParameter(1).data(x) = S(1).data(x);

22 hours ago | 1

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Answered
How can I form a vector operating with another?
n = 0:100; y = (2.^n)./(2*n); You need to use element-wise operators: http://xl48.cn/help/matlab/matlab_prog/array-...

22 hours ago | 0

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Answered
Generate random numbers matrix with different probabilities
This is one way candidates = [-5:0 -5:0 1:23]; % twice as many candidates from -5 to 0 idx = randi(numel(candidates), 15, 20);...

22 hours ago | 0

Answered
How Can I Save a Struct Array to a Text File?
You can directly create a matrix M = cell2mat(struct2cell(s(:)).') writematrix(M, 'filename.txt')

22 hours ago | 0

Answered
how to code simple pendulum motion using ode45
The equation of simple pendulum is , which can be converted to two first order ODEs and then using ode45 like this theta_ic ...

22 hours ago | 0

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Answered
Sum matrix from n=1 to n
Try this m = [2 1 2 3]; out = zeros(size(EGSE_bat,1), 1, size(EGSE_bat,3)); for i = 1:size(EGSE_bat,3) out(:,:,i) = su...

23 hours ago | 1

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Answered
Dimensions of arrays being concatenated are not consistent.
The cell array is made for such cases: http://xl48.cn/help/matlab/cell-arrays.html. It works almost the same, except...

1 day ago | 0

Answered
Work with Symbolic Math Toolbox with units and export data to Simulink´s models parameters
As the error message also mentions, you need to use separateUnits before converting it to double L_LV_dato = double(separateUni...

1 day ago | 0

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Answered
How to display the filename correctly?
You are using the command format of export_fig. MATLAB does not understand fig_name is used to refer a variable and just conside...

1 day ago | 0

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Answered
Function to chop a decimal to a variable number of digits
MATLAB does not recognize what does 'x' means inside fprintf() function call. Try the following code chop(3,4.333352312) func...

2 days ago | 0

Answered
Format coefficients of the derivative of a function
Convert everthing to symbolic to prevent the loss of precision syms x e = exp(sym(1)); f = x * e^x^2; format short df = di...

2 days ago | 0

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Answered
How to read multiple .wav files and plot them as separate signals?
Check this code files = dir('file*'); f = figure(); destination_folder = ''; % put location of destimation folder for i = ...

2 days ago | 0

Answered
String input saves as character.
The correct function name is str2double(), not str2dbl().http://xl48.cn/help/releases/R2020b/matlab/ref/str2double.ht...

2 days ago | 0

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Answered
How do I plot the intersections of two functions???
See this FEX package: http://xl48.cn/matlabcentral/fileexchange/22441-curve-intersections

2 days ago | 0

Answered
Loading variables & using 'for' loop for comman polyeig()
It is not a good idea to name variable like K1, K2, K3, ... It makes code complicated: http://xl48.cn/matlabcentral/a...

2 days ago | 0

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Answered
Extracting the mathematical equation from the Neural Network
Why use a neural network if you want a polynomial fit. Simply use polyfit(): http://xl48.cn/help/matlab/ref/polyfit.h...

2 days ago | 0

Answered
Normalize using first element of vector
A = [10 20 15 12]; A_new = A/A(1)*100; Using normalize() normalize(A, 'scale', 'first')*100

2 days ago | 0

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Answered
Accessing Table entries in MATLAB
There are several ways to access data in MATLAB table: http://xl48.cn/help/matlab/matlab_prog/access-data-in-a-table....

2 days ago | 0

Answered
How to convert from FORTRAN TO MATLAB
I don't think you can automatically convert your FORTRAN code to MATLAB; however, you can compile it as mex file and use it in M...

2 days ago | 0

Answered
Pair the index of aray's same values
Try this b=[1 2 2 1 3 4 1 3 4 3 5 6]; [r, c] = find(squareform(pdist(b.'))==0); pairs = sortrows([r(c > r) c(c > r)]); Res...

2 days ago | 2

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Answered
Use subscript and superscript in legend
plot(1:10); legend('$\overline{H}_{debris}^{front}$', ... 'Interpreter', 'latex', ... 'FontSize', 16, ... 'loc...

2 days ago | 0

Answered
Numerical Integration in Matlab
If you have symbolic toolbox syms x y = ((x.^4 .* exp(x))) ./ ((exp(x) - 1) .* (exp(x) - 1) ); I = int(y, x, 0, inf) Result ...

2 days ago | 0

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