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Ameer Hamza


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Hong Kong Polytechnic University

3,113 total contributions since 2016

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Answered
How to convert script into a function
Defining a function needs you to specify what are inputs and outputs. There are several ways you can write this as a function. R...

1 hour ago | 0

| accepted

Answered
How to find out the minimum error and its index number by comparing two coulmns of matrices?
You can do something like this [min_E1, idx_E1] = min(E1); [min_E2, idx_E2] = min(E2); min_E1 is the minimum value, and idx_E...

1 hour ago | 0

Answered
Plotting Intersection point on plot
You may also have look at this FEX package: https://www.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections.

1 hour ago | 0

Answered
If I want to add the previous 3 terms in a sequence how would I do it?
Just write down in MATLAB what you described in words. The syntax is pretty intuitive n = 10; % number of terms x = zeros(1, n...

1 hour ago | 0

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Answered
String scalar or character vector must have valid interpreter syntax
Here are two options to write this axis ([0,20,0,20]) text(3.0, 8.0,'$\omega=2 \pi*f=2 \pi*c /\lambda$', ... 'Interpreter...

2 hours ago | 0

Answered
Error when plotting.... No points shown in graph
The left side of the line f(x)= (2*(Po-Patm)*A)*x; is not correct. f(x) represent indexing into f using x vector, which is onl...

14 hours ago | 0

Answered
How to write a Transfer Function
You need to have the control system toolbox: https://www.mathworks.com/help/control/index.html for using tf() function. It seems...

18 hours ago | 0

Answered
Use the MATLAB wavread command to import your.wav“chickens.wav”file and, verify that the sampling rate is 8000 Hz. Read the file: “chickens.wav”.
wavread have been removed since R2016a. Use audioread: https://www.mathworks.com/help/matlab/ref/audioread.html instead.

18 hours ago | 0

Answered
Executing save command in App triggers warning "Unable to save App Designer app object"
This link shows how to disable warning temporarily: https://www.mathworks.com/help/matlab/matlab_prog/suppress-warnings.html

19 hours ago | 0

Answered
acos(x) returns complex values. Why do they describe ?
But why do these complex values describe? To understand this, you need to study calculus. This is not just limited to cos(), al...

22 hours ago | 0

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Answered
Sum of cell array columns
Using cellfun, it is a one-liner. XX % 7x50 cell array XX_new = cellfun(@(x) {sum(x,2)}, XX);

23 hours ago | 1

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Answered
Why F vs T graph are not plotted , it shows only blank figure and how i can get all the values of F and T in the workspace as it shows only last value.
You are not specifying the marker type in plot() and also you are not saving vaues of F at each iteration c1 = 27.742*10.^8; c...

1 day ago | 0

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Answered
i want to write code for a question
Although this equation is linear is x, and you can write the equation of x. For a general case, you can use fsolve() c = 0.0038...

1 day ago | 0

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Answered
tf function doesn't work
You need to have the control system toolbox: https://www.mathworks.com/help/control/index.html for using tf() function. It seems...

1 day ago | 0

Answered
How can I assign a number to another number and then create sequences in which I can swap them at will?
Check this code numbers=1:40; numbers_b=[11:14, 21:24, 31:34, 41:44, 51:54, 61:64, 71:74, 81:84, 91:94, 101:104]; assigned=[n...

1 day ago | 0

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Answered
Integrate planck function between two intervals
Check this code and compare it with your code to see the mistakes. c1 = 27.742*10.^8; c2 = 1.43878*10.^4; sigma = 5.67*10.^-8...

1 day ago | 0

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Answered
Plotting coordinate points using plot()
It is giving you points, but the size is so small that they are barely visible. Also, transpose is not needed here. The followin...

1 day ago | 0

Answered
Help.. how would i get 7* to 1*
You can run the for-loop in reverse order too N = 7; for mm = N:-1:1 % equivalent to mm = flip(1:N) for nn = 1:mm ...

1 day ago | 0

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Answered
2d to 3d array conversion
First convert tables to arrays and then use cat() for i=1:14641 a{i} = readtable(strcat('output_',num2str(i),'.csv')); end a...

1 day ago | 0

Answered
VolumeViewer ScaleFactors not working in R2018b
ScaleFactor was not present in R2018b: https://www.mathworks.com/help/releases/R2018b/images/ref/volumeviewer-app.html?searchHig...

1 day ago | 0

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Answered
expanding a given function as a power series?
You need the symbolic toolbox for this problem! syms x y f(x) = x^3+2*x; g = f(exp(y)); g_approx = taylor(g, y, 'Order', 1...

2 days ago | 1

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Answered
how to get data from an interval
You can use logical indexing. Add these lines at the end of your code x = sol.x; y = sol.y; idx = (x > 50) & (x < 180); fi...

2 days ago | 0

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Answered
How can I change the linewidth in a pzmap?
This is one way fig = figure(); ax = axes(); s = tf('s'); G=s+3/((s+4)*(s^2+1)); pzmap(ax, G); l_zero = findall(ax, 'tag...

2 days ago | 1

Answered
Count using mod function
The following example show how to find the even number in a vector using mod(). You can extend it to other cases x = [1 4 3 2 1...

2 days ago | 0

Answered
Additive White Gaussian Noise
You can generate the sine wave using sin() function: https://www.mathworks.com/help/matlab/ref/sin.html. Note that you can get a...

2 days ago | 0

Answered
Averaging oscillating data points
Try lowpass filter if you have signal processing toolbox data = readmatrix('SampleTempData.xlsx'); t = data(:,1); x = data(...

2 days ago | 1

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Answered
My Colored image gets read as a bw image
MATLAB is loading it as an indexed image: https://www.mathworks.com/help/images/image-types-in-the-toolbox.html#f14-17587. The f...

2 days ago | 0

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Answered
syntax of matlab code
You can write-click on the name of the function and click open "Function name". It will take you to the corresponding function u...

2 days ago | 0

Answered
Entering Data to plot Graphs
Just entering as an array would be fine. See plot(): https://www.mathworks.com/help/matlab/ref/plot.html. Here is a very simple ...

2 days ago | 0

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