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how to run principal component analysis in a 3D matrix
You can reshape the matrix to 2D and then when you get results convert it back to the orginal dimensions if needed Reshape arr...

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How do I make a heat/color map from individual data points?
You can interpolate between the points using gridded data interpolation: Interpolate 2-D or 3-D scattered data - MATLAB griddata...

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Copy and paste from MATLAB to Excel?
check the variable preferences preferences Variables and see if "." is selected for number handling See this previous ques...

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X,Y cordinates in a Matrix
Loop through your points like this, although I see XY is probably very long! A=zeros(3,3); disp(A) B=[1 1 1; 1 3 3]; fo...

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How can I assign the same value to a repeating number?
(1) Not sure why "alocados" is just a random order of "datos" but you can do this any time, before or after Prb is assigned righ...

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eig versus svd functions to calculate eigenvalues of complex matrix
I saw an answer Student in stackexchange that says eigenvalues and singular values coincide for a matrix that is real symmetric ...

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Stacked bar graph with repeating datetime
You need to reorder your data into a matrix with shape "Number of Unique Dates" by "Maximum Measurements on Any Date" Something...

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Magic is simple (for beginners)
Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.

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Help me understand!
Equation 3 is a 2nd order system p''=..., the RK3 is given for 1st order p'=...(see it's first difference ) =..) See for exampl...

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How to deal with Index exceeds the number of array elements??
You could pad the missing data with 0 or nan. Anyway if you want to ignore the incomplete cycle just check out-of-bounds and co...

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How to plot heatmaps inside a table?
Maybe just have different axis for each radar. There are a few ways, but tiledlayout is easiest: heatvals = rand(4,40); % r...

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Lookup values in other table that has a range of values
Something like this would add the gamma variable to your first table, BUT it's matching to nearest gamma rophole12.gamma = inte...

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Three dimensional averages?
You can specify the dimension of averaging: Average or mean value of array - MATLAB mean (mathworks.com) M = mean(A,dim) M = m...

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How to fit multiple curves to histogram subpopulations?
You could fit a distribution to the histrogram using histfit or fitdist, then identify the number of modes or peaks, N. Then fi...

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how is keep the output values in program?
you can use save and load, here is a quick example: % run once, save results x = 1; y = x+1; save('case1.mat') % modify a...

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Calculate area from a signal
You can use trapezoidal rule: see trapz: Trapezoidal numerical integration - MATLAB trapz (mathworks.com) area = trapz(x,y) % i...

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Phantom cine format and Photron mraw
I don't think there is a built in method, but using fread you can open mraw format. I used this one in the past: Reader class f...

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How to use a filename character array as a name of a variable?
You can use EVAL (see Stephen's comment to why this can cause error) [~,varname]= fileparts(filename) data = [....]; % your da...

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Early detection system of diabetic retinopathy using eye images by using matlab
If you have some labeled data you can try make a classifier see these examples Create Simple Image Classification Network - MAT...

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Solving an implicit equation (iteration)
The formula has the form of an atracting fixed point if it looks like A=f(A) (and other conditions see the links below), then yo...

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Resampling a signal without using built-in command
Regarding t: Your time intervals don't need to change length just the step size. Regarding x_a: you need to keep only the sampl...

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Solution of implicit function - how to plot implicit functions?
Based on the equation you posted, the variable A=2*pi needs to be squared when it's inside the square root. But your code doesn'...

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Finding the frequency spectrum of a list of column data
Here are three options 1) My favorite is to use pspectrum(data,fs). Where fs is sample frequency. For more information 'doc ps...

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Plotting the range of a variable with defined intervals.
The plot documentation shows you can specify the type of line and markers like this x=0:0.1:1; % use colon notation to create a...

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With two different initial values I am getting two different answers in fsolve. How to decide which one is more reliable?
The results are almost the same, but you can take a look at the display for each iteration see fsolve documentation, here is an ...

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Question

Incorrect font size for tiledlayout in livescript output [Bug?]
Using tiledlayout in a livescript does not output with the correct font size for the axis. Is this a bug? See example below, ...

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Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

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