Chunru

Last seen: Today | Active since 2013

Matlab user since 1990

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How to vectorize the function?
fc=1e+8; % carrier fm=1e+3; % modulate fd=7.5e+4; % frequency deviation r=0.25; t0=0.0005; % reflection and delay w0=2*pi...

environ 2 heures ago | 0

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How do I move an item in an array to the end of that array?
T = [1 5 77 10 15 20 25 33]; T1 = sort(T) % Method 1 T2 = T([1:2 4:end 3]) % Method2

environ 4 heures ago | 0

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How to set x axis in a plot?
subplot(6,1,1:5); imagesc([1 8], [14, 22], randi(100,100)); subplot(8,1,8); imagesc([1 8], 1, [1 2 2 2 2 2 2 3 3]); set(gca, ...

environ 4 heures ago | 0

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How to create a moving average filter to a specific signal
x = readmatrix("2013.txt"); n = 7; % filter order y = filter(ones(n, 1)/n, 1, x); plot(x); hold on; plot(y); legend('Or...

environ 4 heures ago | 0

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use matlab code to draw the joint PMF and CDF
[x, y] = meshgrid([0 1], [0 1]) z = [0.25 0.5; 0.125 0.125]'; stem3(x, y, z) xlabel('x'); ylabel('y'); zlabel('p')

environ 6 heures ago | 0

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Extract Tables from within a cell
s = load("Tables") % i-th tables i = 1; t = s.Tables{i}

1 jour ago | 0

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Populating a vector between upper and lower bound?
e0 = 0; % Initial strain values e_max = 4; % Max strain values inc = 1; % +ve increase, -ve decrease e_t ...

1 jour ago | 0

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Answered
same number in the vector
h=[0.12;0.1;0.1;0.04;0.04;0.04;0.1;0.1;0.1;0.06;0.1] hu = unique(h); idx = sum(h -hu' == 0) > 1; hrep = hu(idx)

1 jour ago | 0

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Answered
cluster points within given radius
n = 300; R = 350; x0 = 50; % Center of the circle in the x direction. y0 = 90; % Center of the circle in the y direction. an...

1 jour ago | 0

Answered
Subplot with Geoaxes.
"geoaxes" cannot be the child of subplot. But we can set its position as follows (2x2 grid for example): for i=1:2 for j...

1 jour ago | 0

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Getting the a day of a month based on Vac(day,month)
calendar(2021, 3)

1 jour ago | 0

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convert real numbers to img form
a = 8 b = a*1i % method 1 c = complex(0, a) % method 2

2 jours ago | 1

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Restricting time on graph with given time
a = datetime(2021, 1, 1:365); b = rand(size(a)); plot(a, b) idx = find(month(a)==1); xlim([a(idx(1)), a(idx(end))])

2 jours ago | 1

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How to add a cylinder to a scattered plot
% A = load ('Data.txt'); A = 0.05*rand(8, 4) x = A (:,1 ) ; y = A (:,2 ) ; z = A (:,3 ) ; Amplitude = A (:,4) ; scatter3 ...

2 jours ago | 0

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Answered
Calculating mean square difference (MSD) of two matrices
Im = [0 252 204; 221 135 58; 156 122 127] Im2 = [169 250 237; 186 196 148; 227 148 4] F2 = sum(sum(mean(Im...

3 jours ago | 0

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Answered
how to save variable as txt in a specified location with variable value appearing in the file name
a=1; % amplitude du faisceau gaussien x=linspace(-50,50,100); dx=50/2.355; % widthn f=a*exp(-0.5*(x./dx).^2); [pks, locs, wi...

4 jours ago | 0

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Answered
Quiver plot when axes scale are too different result in very ugly plots
load("quiverPlotVariables.mat") whos % You need to scale the vdot and/or psidot so that they are representing % the true orie...

5 jours ago | 0

Answered
How can delete the variable part?
s = load("T9S11.mat"); x = s.T9S11 x(2:2:end,:)=[]

5 jours ago | 1

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repmat usage for cellarray
data_string = reshape(char(32:127), 3, []) % some characters32 x 3 char aray cell_array=repmat({data_string},1,3) cell_array{...

10 jours ago | 0

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Append vector into zero matrix
v = zeros(5, 3); x = randn(3,1); n = numel(x); for i=1:size(v, 2) v(i-1+(1:n), i) = x; end v

11 jours ago | 0

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Answered
benefits of using "Structs" over "Cells" in MATLAB/Octave?
See the documentation: https://www.mathworks.com/help/matlab/matlab_prog/cell-vs-struct-arrays.html Struct use field name to ac...

11 jours ago | 0

Answered
Marker edges, line width and legend
xx=linspace(0,12); figure(1) plot(xx,sin(xx),'LineStyle','-','LineWidth',2,... 'Color','red', 'HandleVisibility','off');...

11 jours ago | 0

Answered
Modify a text file
% Assume that your text file is data.txt s = fileread("data.txt"); s = strrep(s, '4.500000e-001', '0.8000'); fid = fopen('d...

11 jours ago | 0

Answered
nanstd use in matlab
You are using default normalization "[]", which normalised the std by (N-1). If you want to get 0.0129, you need to change [] i...

11 jours ago | 1

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What's wrong in the code? I cant generate the same graph as the question required.
x = -5:0.1:5; y = sin(x.^2).*exp(cos(x)); plot(x,y)

11 jours ago | 0

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Answered
I have problem with while loop.
Make the following change: %while (szb(1,1)~=szA(1,1) && szb(1,2)~=1) while (szb(1,1)~=szA(1,1) || szb(1,2)~=1)

11 jours ago | 1

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Answered
Solution found by matlab is too big to use
There are two solution of the equation. You need to select one. The modified code choose the 1st solution. You can always to ...

11 jours ago | 0

Answered
How to create one common colorbar and colorscale for subplots
You need to add in the following inside the loop for each subplot: caxis([0 60]); % adjust the number 60 or find the value fr...

11 jours ago | 0

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Answered
Trying to do product of eigenvalues collected from a matrix
First the difference "e" (as below) will not be perfectly 0 and it is subjected to computational accuracy. Second, the eigen va...

11 jours ago | 0

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Why does my function return a single value instead of an array? I need it to return an array so I can plot it.
Use ./ instead of / for array operation. [Note that there is division by 0 in your equation] Dn2 = @(n) (1-exp(-1j*pi*n/2))./(...

11 jours ago | 0

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