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I want to change the spectrogram time scale from minutes to seconds but I am unsure how.
You can change the xticklabel: h = gca; h.XTickLabel = string(h.XTick * 60); xlabel('Time (s)'); Alternatively, compute the ...

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How to i convert complex single into complex double?
frame = single(3+4i); % Convert to double frame = double(frame) class(frame)

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Go to the head of the class!
You're given a matrix and a single number. If that number is in the matrix, reorder the matrix so that number is in the first r...

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Toeplitize a matrix
Similar to <http://www.mathworks.com/matlabcentral/cody/problems/3094-hankelize-a-matrix Problem 3094. Hankelize a matrix>, now ...

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What is the code for generating X(k) from given X(n) = [1 2 3 4] using Fast Fourier Transform?
x = [1 2 3 4]; xfft = fft(x) y = ifft(xfft)

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Dispay information for Button in AppDesigner
Use 'Tootip' property. k = uibutton('Text', 'TestTooltp', 'Tooltip', 'Show some information when hover over') The documentat...

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How to see values in heatmap when we use subplot
Either increase the figure size or reduce the font size, or both: figure('Position', [0 0 1024 768]); subplot(2,2,1); a=rand(...

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set same ylim for all subplot (plot yy)
%% yyaxis plot x = linspace(0,10); y = sin(3*x); yyaxis left plot(x,y) z = sin(3*x).*exp(0.5*x); yyaxis right plot(x,z)...

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Change stem colour of particular values
x = (1:66); y = randn(1, 66); % your data figure; hold on stem(x, y, 'r'); i1 = [39 53 59]; stem(x(i1), y(i1), 'g');

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How to orient multiple STL files the same way?
%% clc clear close all figure(100) subplot(131) model = stlread('wristband_1.0.stl'); %Reads STL trimesh(model); %Plots...

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Using MATLAB and simulink, simulate the radiation pattern of an omnidirectional antenna
For ominidirectional response, it is a constant over directions. If you use phased array toolbox, you can plot the pattern: an...

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How to find the percentage/number of pixels in each class of an indexed image?
Remove the nans before the line 'numberOfBins = max(fcls(:))'. This way the hist will not count on nans. fcls = fcls(:); fcls ...

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How do I solve the double integral determined by the surface z=4x^2-y^2 over the rectangular region created by the coordinates (0,0),(4,0),(0,3) and (4,3) in the xy-plane?
You can do a numerical integration: z = integral2(@(x, y) 4*x.^2 - y.^2, 0, 4, 0, 3)

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How do I overlay worldmap outlines onto an imagesc plot?
You can use pcolorm instead of imagesc: % define and generate color plot x = [-180:5:180]; y = [10 5 0 -5 -10]; d1 = rand(5,...

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how to interpolate for increasing - decreasing type of data set
Since tr1out is outside the range of theta1, you are doing extropolation as well. For the default interpolation method, the ext...

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Make elements of matrix ones
A slightly simpler version: A = zeros(248,286); %create matrix of zeros A(20:60,[124:134 144:154 164:174]) = 1; A(70:120, [1...

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Remove the air bubbles
Given a matrix a, return a matrix b in which all the zeros have "bubbled" to the top. That is, any zeros in a given column shoul...

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~~~~~~~ WAVE ~~~~~~~~~
|The WAVE generator| Once upon a time there was a river. 'Sum' was passing by the river. He saw the water of the river that w...

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Draw 'B'
Draw a x-by-x matrix 'B' using 1 and 0. (x is odd and bigger than 4) Example: x=5 ans= [1 1 1 1 0 1 0 0 0 1 ...

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Draw a 'N'!
Given n as input, generate a n-by-n matrix 'N' using 0 and 1 . Example: n=5 ans= [1 0 0 0 1 1 1 0 0 1 1 0 ...

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Draw 'C'.
Given x as input, generate a x-by-x matrix 'C' using 0 and 1. example: x=4 ans= [0 1 1 1 1 0 0 0 ...

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Draw 'H'
Draw a x-by-x matrix 'H' using 1 and 0. (x is odd and bigger than 2) Example: x=5 ans= [1 0 0 0 1 1 0 0 0 1 ...

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Draw 'J'
Given n as input, generate a n-by-n matrix 'J' using 0 and 1 . Example: n=5 ans= [0 0 0 0 1 0 0 0 0 1 0 0 ...

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Draw a 'X'!
Given n as input Draw a 'X' in a n-by-n matrix. example: n=3 y=[1 0 1 0 1 0 1 0 1] n=4 y=[1 0 0...

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Draw 'E'
Draw a x-by-x matrix 'E' using 1 and 0. (x is odd and bigger than 4) Example: x=5 ans= [1 1 1 1 1 1 0 0 0 0 ...

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Bottles of beer
Given an input number representing the number of bottles of beer on the wall, output how many are left if you take one down and ...

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Summarize three-way table
It could be something like this: % Assume table (T) with these variables: year, region, type_of_patents, regional_share % Fi...

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How to input image in array?
You can use cell array so that each cell stores an image (of different size). im{k} = imageArray;

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Index exceeds the number of array elements (0)
aux = (find(b(:,q) >= 255)); % This could be empty if ~isempty(aux) FinalArray (q) = [aux(1)]; end

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array in power place minus known variable
Use .^ for power of an array of numbers. p = (10: .25: 15) I = 12.6 .^ (p-9.50 +2); plot(p,I)

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