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Program code for convolution
u = [1 2 3 1]; v = [2 3]; conv(u, v) % filter(u, 1, v)

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plotting a surface on a cylinder top face
theta =0:0.01*pi:2*pi; r=0.8; x=r*cos(theta); y=r*sin(theta); z=zeros(size(x)); % simple patch for base p_base =patch(x,...

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How to remove cell data from specific column using dates as a reference?
T = readtable("https://www.mathworks.com/matlabcentral/answers/uploaded_files/1085695/flowrate_dates.xlsx", "Sheet", 3) idx = T...

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combine two cell into one string
t = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1085370/SummaryResult%20-%20Copy.xlsx'); t = t(1:...

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Echo+noise signal
% generate a waveform f0 =100; fs=1000; pw = 0.1; pri = 1; npulses = 10; s = cos(2*pi*f0*(0:1/fs:pw))'; % it can be ...

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Spectogram Of I and Q data
x = xi + 1i*xq; spectrogram(x)

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Transfer Quarterly dates to Monthly
% Your data dtstr = ["31/3/1992" "30/6/1992" "30/9/1992" "31/12/1992"]; x = [1.2 1.3 1.4 1.5]...

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What is the training accuracy of this model?
If Labels is character array instead of string array, then numel(Labels) will give the number of characters instead of the numbe...

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Get coordinates points inside a 3-D circle in MATLAB
normal=[-3.5556 -0.2222 1.0000]; center=[138 146 219]; radius=3; plotCircle3D(center,normal,radius); hold on point = p...

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How can I label multiple routes on a geoscatter plot?
fig = figure; %pos = fig.Position; %files = dir('cast*.gpx'); for i = 1:5 %length(files) %filename = files(i).name; ...

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operation on single elements in MATLAB
x=-2:1:2; %coordinates x y=x.^2; %coordinates y z=[x;y] d = diff(z, 1, 2) % diff along 2nd dim d = vecnorm(d...

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specifying frequencies in pwelch not working
No problem for on-line matlab. data = randn(20000,1); %assume this is 1 row of my EEG data of interest analysisWinSize = 1000...

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Create duration array template
ti = duration('00:00:0.00','Format','hh:mm:ss.SSS'); tf = duration('02:00:0.00','Format','hh:mm:ss.SSS'); interval = millise...

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Multiply values in array by *-1
a = randn(1, 106); a(14:20) a(16:18)=-a(16:18); a(14:20)

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How to find sum of previous 5 numbers in a column..
x = [56 45 56 678 678 568 2 3 4 5]; y = filter(ones(5,1), 1, x) y1 = y(5:end)

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Graph function problem Incorrect values
What's wrong? x=[0:50]; y=-x.^3+3*x.^2+2*x-27; plot(x,y)

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How to reduce running time of diagonal matrix multiplication with full matrix in Matlab?
n = 2000; d=500; B = randn(d, n); dv = randn(n, 1); D = diag(dv); % Normal tic A = B*D*B'; toc % Speed up 1 tic C = ...

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How to make a number NaN when its both neighbours are NaN?
A = [NaN 2.35 NaN 2.358 1.68 1.98 2.88 NaN 2.68 NaN 2.70 NaN 2.20 NaN 3.03; NaN NaN 2.77 NaN 2.67 1.87 2.56 1.88 2.39 NaN...

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adding an if condition so the negative value would be set to zero
for i=1:length(t) DOD(i)=cumsum((T(i)*30)/(3600*14.6)); end DOD = max(DOD, 0)

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Circular bar graph in matlab
% Some data T.Country = string(('A':'Z')'); T.Population = randi([1000 10000], size(T.Country)); T = struct2table(T); n = he...

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Plot with break in curve
xy=[0.0000 -963.0477 0.0043 -961.9818 0.0085 -960.8602 0.0128 -959.6834 0.0171 -958.4515 0.0214 -957.16...

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removing the pixels with different size and unregular shape
A simple approach is to find the regions you want to deleted (assign 0). Four your question, rectangle regions are sufficient: ...

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How to plot like this graph?
% [1 2][3 4] % [6 7] h(1) = subplot(2, 4, [1 2]); % 4x2 grid, 1st subplot plot(randn(10, 1)); h(2) = subplot(2, 4, ...

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Error using mesh Z must be a matrix, not a scalar or vector. Error in untitled6 (line 5) mesh(W,Y,Z)
w = 200:50:450; y=120:30:240; [W,Y] = meshgrid(w,y); Z= 64.0189+1.4629*W-2.626*Y-0.0012*W.^2+0.0098*W.*Y+0.0082*Y.^2; whos ...

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How to read .XY file?
file='random_x.txt'; fid = fopen(file, 'rt'); i=1; s1 = ''; while ~feof(fid) s{i} = [s1 fgetl(fid)]; %...

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regexp function - get index of string with two conditions
str = {'strawberry/banana#(';'apple#,melon*cherry';'apple_banana_cherry'}; s = regexp(str, '^apple.*(cherry)$', 'match'); id...

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creating a rectangle plot
p = [0 2 2 3 3 5 5 0 0; 0 0 1 1 0 0 4 4 0]; plot(p(1,:), p(2,:))

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copying the contents of a vector onto a longer vector
a = [1 2 3 4]; b = a(mod(0:9, 4)+1)

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How to design a FIR filter by the -3db bandwidth?
Generally speaking, you don't have to worry about -3dB attenuation at the cut-off. You just specify the pass-band and stop band...

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To generate a series with n numbers on and n numbers off
n = 8; xmax=100; x = (0:n-1)'+(n:n*2:xmax); x=x(:)

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