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Ameer Hamza


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Hong Kong Polytechnic University

4 338 total contributions since 2016

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Answered
how to solve a system of equations in matlab
An alternate from symbolic toolbox syms x F = piecewise(x<=0, x+2, x>0, -x+2); fplot(F, [-2 2])

ungefär 2 timmar ago | 0

Answered
How I can extract an object entry from an index of cell array?
Use the curly brackets to access the content inside the cell arrays tempCell{1,1}.dist = 100;

ungefär 2 timmar ago | 0

Answered
Question about constraints in optimization problems
This is due to the finite precision of floating-point numbers. Calculations on floating points numbers can accumulate errors, so...

ungefär 2 timmar ago | 0

Answered
How to form a binary matrix from a given two vectors?
I am not sure how the elements of B are used in C. Consider following code A = 1:10; n = 10; C = arrayfun(@(x) {repmat(x, 1...

ungefär 3 timmar ago | 0

Answered
Determine the frequency with find and diff
You can use findpeaks(): https://www.mathworks.com/help/signal/ref/findpeaks.html or islocalmax(): https://www.mathworks.com/hel...

ungefär 5 timmar ago | 0

Answered
I have two 3d points, A(1,0,0) and B(0,1,0). And I connect these two points as a line AB. How to divide this line into 10 equally segments and get their coordinates?
This is one way A = [1,0,0]; B = [0,1,0]; n = 10; X = [A; B]; t = linspace(0, 1, n+1); points = interp1([0 1], X, t) Re...

ungefär 21 timmar ago | 1

| accepted

Answered
Can one save the filename as a variable in 'readtable'?
you can save char arrays in a variable and then concatenate it with the extension using [] operator. filename = 'texas'; T = r...

ungefär 21 timmar ago | 1

Answered
difference between adjacent elements of a vector
A = [1,4,6,10,33,200]; out = A(1:end-1) - A(2:end); Read about indexing here: https://www.mathworks.com/company/newsletters/ar...

ungefär 21 timmar ago | 0

| accepted

Answered
How to find and plot the absolut average error of a fittet curve to a Set of Data
You can add the absolute error between actual datapoints and fitted curve like this p{i} = polyfit(x_relevant{i}, y_relevant{i}...

ungefär 24 timmar ago | 0

Answered
Array indices must be positive or logical values.
In MATLAB, the index of an array starts from 1 (as compared to many other languages where it starts from 0). Therefore, these li...

en dag ago | 2

| accepted

Answered
How to draw line graph with same values in this bar graph?
Are you looking for something like this x = [1 2 3 4 5 6 7]; temp_high = [149.1350 143.9020 19.1230 19.0350 11.8150 19.8610 1...

en dag ago | 0

Answered
why Matlab websave function doesn't work?
websave() was introduced in R2014b. There is no way to use it in R2014a.

en dag ago | 0

Answered
3D plot of 3 vectors
You first need to convert your data into a grid format using scattered interpolation x = data(:,1); y = data(:,2); z = data(:...

en dag ago | 0

| accepted

Answered
How to use For loop or any other loop to rearrange elements in a matrix using Matlab?
Try this M = readmatrix('Boundary_closed_1s_3s.txt'); for i = 1:size(M,1) idx1 = find(M(i,:), 1, 'first'); idx2 = ...

en dag ago | 1

Answered
How to add values at blue dots in graphs?
There is no general way. You can use text() to place the values, but to customize the location will require manual tweaking. For...

en dag ago | 0

| accepted

Answered
how to make if accept letters?
Several problem: 1. = is an operator for assignment in MATLAB. For comparison, you need to use == if yesno == y 2. You want t...

en dag ago | 0

| accepted

Answered
Property validation for a vector
You can use mustBeVector validation function. properties Col {mustBeVector} end Functions are listed here: h...

2 dagar ago | 0

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Answered
1x2 Cell with each ?field? containing 2 values
You have 'a' like this a = {[1 2], [3 4]}; To access first elemets, you need to use indexing like this a{1,1}(1) a{1,2}(1) ...

2 dagar ago | 1

Answered
Indexing of a size() object
Unlink some other languages, such a chain of indexing is not supported in MATLAB. You can find the discussion on this issue on t...

2 dagar ago | 1

| accepted

Answered
arg min for Optimization problem
You can use fminunc(): https://www.mathworks.com/help/optim/ug/fminunc.html or fmincon():https://www.mathworks.com/help/optim/ug...

2 dagar ago | 0

Answered
add labels to x axis
Add this line at the end of your code xticklabels(X)

2 dagar ago | 0

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Answered
Problem in putting limit to the variable
'x' is already in this range. You are printing the value of 'extreme_values', not 'extreme_points' syms x f=0.3*(x-0.6)*(x-0.9...

2 dagar ago | 0

Answered
How can we do for following fprintf formating
It is not possible to do such thing in command window currently: https://www.mathworks.com/matlabcentral/answers/255568-putting-...

2 dagar ago | 0

Answered
Create matrix with two matrices
You can do something like this A = [1 2 3; 4 5 6;7 8 9]; B = [ 11 12 13;14 15 16;17 18 19]; Matrix = zeros(size(A,1)+size(B,1...

2 dagar ago | 0

Answered
How to create a Nx3 array from Nx4 array
You can use cellfun() C1; % 100x1 with Nx4 matrices C2 = cellfun(@(x) {x(:,2:end)}, C1);

2 dagar ago | 0

| accepted

Answered
Non-linearly spaced axis
You need to set the xscale to 'log'. Run the following line after creating the plot xlim([0.01 1000]) set(gca, 'XScale', 'log'...

2 dagar ago | 0

| accepted

Answered
Plotting the given Trigonometric functions
You can use fimplicit() fun = @(x, y) y.*sin(2*x) - x.*cos(2*y); fimplicit(fun, [-10 10 -10 10])

2 dagar ago | 0

| accepted

Answered
solution of a system non linear equations
If your system of equations has multiple solutions, fsolve() can only give you a single solution based on the initial point x0. ...

2 dagar ago | 1

Answered
how do i substract the first value from the last one on an array taking out zero values?
If all the non-zero values are in increasing order, the try this M(M~=0) = M(M~=0) - min(M(M~=0)); Result >> M = [ 0 ...

2 dagar ago | 0

Answered
get the image from the NYu depth dataset
The screenshow shows that the dataset loads images in a 4D array. You need to specify which image you want to see. For example ...

2 dagar ago | 0

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