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Ameer Hamza


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Hong Kong Polytechnic University

4.629 total contributions since 2016

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Answered
append sections of column by n rows to subsequent column
You can use reshape() v; % 1032x1 vector M = reshape(v, 43, [])

14 días ago | 0

Answered
Please Help Optimization using PSO
Check the code of this FEX package: https://www.mathworks.com/matlabcentral/fileexchange/75101-non-linear-equality-and-inequalit...

14 días ago | 0

Answered
How can I find distances between 100 points such that I have a set of distances of each point from rest of the points.
Just use pdist() function X = [..]; % create 100x3 matrix dists = pdist(X)

17 días ago | 1

Answered
Binary value convert.
Read about logical indexing A = [0 1 0 1;1 0 0 1; 0 0 0 1; 1 0 0 1]; A(A==0) = -1;

17 días ago | 0

| accepted

Answered
matrix arithmetic numbers short way
Yes, quite easily. A = 1:30; Read about colon operator: https://www.mathworks.com/help/matlab/ref/colon.html

17 días ago | 0

Answered
Change the sign of column of imported file in matlab.
Something like this M_new = M.*[-1 1]; % change sign of 1st column M_new = M.*[1 -1]; % change sign of 2nd column or M_new =...

18 días ago | 0

Answered
obtaining large numbers while using syms
Specify the number of digits in vpa() to vpa(x, 4)

18 días ago | 0

Answered
Consider preallocating for speed
It is not an error message; it is just a warning. Pre-allocation helps make the code faster. Read my answer here to get a genera...

19 días ago | 0

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Answered
How can increase a binary image in size by padding ?
See padarray(): https://www.mathworks.com/help/images/ref/padarray.html For example im = imread('https://www.mathworks.com/ma...

19 días ago | 0

| accepted

Answered
finding all roots of a trignometric equation
range of tan(x) is (-inf inf), so this equation has an infinite number of solutions. Also, the solutions to this equation cannot...

19 días ago | 0

Answered
Add elements to a matrix
Use repelem() A = [1 2 3; 4 5 6; 7 8 9] B = repelem(A, 1, 2) Note: In MATLAB [ ] are used to create arrays.

19 días ago | 1

| accepted

Answered
Logical Indexing Within a Symbolic Array
Try this syms w1 w2 w3 w4 w5 w6 w7 w8 w9 w10 A = [0 0 0 w7 0 0; 0 0 0 0 w9 0; 0 w3 0 0 0 0; 0 0 w5 0 0 0; ...

19 días ago | 0

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Answered
How do I replace elements in a vector with other vectors?
Don't create variable name dynamically like rectColor1, rectColor2, .. It always makes code more difficult. Following shows how ...

19 días ago | 0

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Answered
Read STL FILE on MATLAB
No, this is not how a function is called in MATLAB. Read here: https://www.mathworks.com/help/matlab/matlab_prog/create-function...

19 días ago | 0

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Answered
Difference between datetime values in minutes
Try this col = minutes([all_combined_short{:,1}].'-all_combined_short{1,1})+1; all_combined_short = [num2cell(col), all_combin...

19 días ago | 2

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Answered
Placing data in a matrix
Directly use reshape() B = reshape(A, [36 353]).'

19 días ago | 0

| accepted

Answered
How to generating surface without plotting?
Since it is a graphical object, you cannot create it without plotting somewhere. However, you can make the figure invisible so t...

19 días ago | 0

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Answered
Calculate mean value from different matrices
How are 5 matrices available? Is it a cell array? Try something like this C = {M1, M2, M3, M4, M5}; M = cat(3, C{:}); M_mean ...

19 días ago | 0

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Answered
Create function such that for each element of the vector it applies different function
Try something like this a = 1; b = 1; x = [2; 4]; f1 = @(x) a*x(1) + 1; f2 = @(x) b*x(2) - 1; F = @(x) [f1(x); f2(x)];...

19 días ago | 0

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Answered
call function for each combination of rows in A and columns in B
Try this Xtrain = [1 2; 3 4; 5 6]; Xtest = [7 8 ; 9 10]; kernel = @(x1,x2) norm(x1 - x2); m = size(Xtrain, 1); n = size(X...

19 días ago | 1

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Answered
caxis equivalent for slice plot
caxis() also works for slice(). See the difference between two figures [X,Y,Z] = meshgrid(-2:.2:2); V = X.*exp(-X.^2-Y.^2-Z.^2...

19 días ago | 0

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Answered
How do i make this code as simple as possible? :(
First, naming variables like final_1, final_2, ... is a bad coding practise: https://www.mathworks.com/matlabcentral/answers/304...

20 días ago | 0

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Answered
Taylor expansion calculation of exp(x^2)
The formula for taylor series is correct. Just increase the number of terms. x = -3.0:0.1:3.0; N = 12; Taylor_p2 = 0; for n ...

20 días ago | 1

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Answered
Outputing a correspond element of another variable
Try this A = ["Bayo" "Tun" "s"]; B = [21, 45, 11]; [~, idx] = max(B); output = A(idx); Result >> output output = ...

20 días ago | 1

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Answered
How can I interpolate a datetime data series to have an interval of 1 minute in MATLAB?
Try something like this T = readtable('sample.xlsx'); [grps, unique_mmsi] = findgroups(T.mmsi); tts = splitapply(@(la,lo,da...

20 días ago | 1

| accepted

Answered
separet value in one colone to many colone
Try this mtx= [1 101; 2 011; 3 111; 4 110; 5 110]; cols = reshape(sprintf('%03d', mtx(:,2)), 3...

20 días ago | 1

Answered
How to perform high-precision fitting of points on unknown trajectories? And calculate the fitting coefficient.
If you don't have the equation, then use a non-parametric curve fitting: https://www.mathworks.com/help/curvefit/nonparametric-f...

20 días ago | 0

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Answered
How can I solve this complex 4 equation with 4 unknowns variables
You can specify 'MaxDegree' as input to solve() syms K1 K2 K3 K4 equ1 = K2+K4-36 equ2 = K2*K4+K3+K1-486 equ3 = K2+2*K2*K3+2*...

20 días ago | 0

Answered
Do I need to uninstall another version of MATLAB before installing an new version with different products?
MATLAB installations are independent of each other. You can delete the previous installation directory directly before installin...

20 días ago | 0

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Answered
Contour plot of XYZ data
Try this x = hfm(:,1); y = hfm(:,2); z = hfm(:,3); xg = linspace(min(x),max(x)); yg = linspace(min(y),max(y)); [Xg, Yg] ...

20 días ago | 0

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