Answered
How can I get a variable that starts in t=0?
y(1, 1) = 500; % Set initial value before the loop for t = 1:249 % y(1, :) is defined already, so start at t=1, not t=0 ...

1 year ago | 1

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Most practical way to speed up calculations?
I've seen many examples in the forum, where the old and fundamental method of vectorization slows down the execution compared to...

1 year ago | 0

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Answered
How to create 4D array of images
Maybe this is enough: List = dir('C:\ParentOf_A_B_C', '**', '*.gif'); Array = []; for k = 1:numel(List) img = imread(fu...

1 year ago | 0

Answered
How to perform derivative of a random signal without finite difference schemes?
You can try a Savitzky-Golay-Derivative filtering: https://www.mathworks.com/matlabcentral/fileexchange/30299-savitzky-golay-smo...

1 year ago | 0

Answered
fprint f for a matrix
x = [0 3 0; 1 2 3]; c = sprintfc('%g', x.'); c(x.' == 0) = {''}; fprintf('\t%s\t%s\t%s\n', c{:}) % Or: s = compose("%g",...

1 year ago | 0

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How can I reuse numerical values them back as inputs?
Working with functions is the way to go. You cannot use Matlab efficiently without functions. But as far as I understand, your ...

1 year ago | 0

Answered
Can I access local functions for unit testing
You can call subfunctions only from their main function. This impedes a unit-testing. But the main function can provide a functi...

1 year ago | 0

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Answered
why do I receive not enough input arguments
signal_avg_limt "(Dec20-1(cut4&2)_filter, 50, 094167" This calls the function with 1 argument: a string. I guess you mean this ...

1 year ago | 0

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Truncate strings to maximum length
Omit arrayfun: str = ["ab", "cdefg"]; extractBefore(str, min(4, str.strlength())+1) If this still looks to clumsy, write your...

1 year ago | 1

Answered
How to share relatively large data among GUI callbacks?
50 MB is not a large array in times of Gigabytes of RAM. Sharing an array by guidata does not create deep copies, but Matlab use...

1 year ago | 0

Answered
In what way is the new R2021b Editor UI "improved"?
I still miss the editor option existing inMatlab 6.5, which allowed to provide the selected text as input to functions defined b...

1 year ago | 0

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Decode a base64 code into a audio file and save it
Look into the output of the base64 decoding. You find these characters on the top: .E...B...B...B...B...B.. webmB...B....

1 year ago | 1

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Answered
Sort producing inconsistent results when re-ordering legend
lines = sort(findobj(gca,'type','Line')) This is a bad idea. findobj replies the handles to the line objects. To feed sort with...

1 year ago | 0

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How shift output of array
If the transformation should be linear, this is a multiplication: a = [-1, 1] b = a * pi But "[-1 -0.5 0 0.5 1] -----> [-p...

1 year ago | 0

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How to write ASCII characters corresponding to decimal numbers into a file?
This writes the character 'A' at the current file position: n = 65; fwrite(fid, n, 'char')

1 year ago | 0

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For loop to delete rows from matrix
M = randi([0, 5], 10000, 5); % Some test data P = M(M(:, 2) == 3, :); % Keep only rows, which have a 3 in 2nd column % ...

1 year ago | 0

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pass a struct through a loop to extract data and have the i in the loop added to the name
The best idea is to use an index as index: accuracy_totals(1).accuracy_total(i) Arrays are smarter than a pile of fields with ...

1 year ago | 1

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Answered
CELL2MAT does not support cell arrays containing cell arrays or objects
table2struct(direc); This line converts the table direc to a struct, but ignores the result. In consequence this line has no ef...

1 year ago | 0

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What is the most efficient way to "reverse" interpolate a 3D array?
Creating the grid matrices is not useful. The interpolation is about 10 times faster using the original vectors. % Omit: % [b...

1 year ago | 0

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Answered
I want to extract digits from a cell array but not the digit zero
data = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1291690/Extract.xlsx'); nRow = height(data); ...

1 year ago | 1

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Answered
manual script for loop
MedComb(:,1) = 1:15; MedComb(1:15,2:6) = NaN; xcol = 20:24; for i1 = 1:2 for i2 = 0:1 [r, c] = find(tNino...

1 year ago | 0

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Answered
Why I'm getting this error( Array indices must be positive integers or logical values)?
When I run your code, it stops with the error, the w is undefined in the line: w(n+1) = w(n)+(2*0.01*e*[x(n),x(n+1),x(n+2)])% ...

1 year ago | 0

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How to get around using pack function in matlab 2022b?
The pack command is not useful anymore. Try to comment it out in the code. Asking the author is a good option also.

1 year ago | 0

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Answered
Invalid use of operator
The old problem: Strange methods to define names of variables dynamically using eval() demands for even stranger methods to acce...

1 year ago | 0

Answered
How to check that these points formulate flat plane(on the same plane)?
P1 = [396326796.725069,-205153846.153846,0,0,0,0]; P2 = [-205153846.153846,396326796.725069,-205153846.153846,0,0,0]; P3 = [0,...

1 year ago | 1

Answered
Monod nonlinear regression solved with Ode45
A guess: You call the function ParameterJack with 2 inputs: w=ParameterJack(ps,t); But the function requires 5: function dCdt...

1 year ago | 0

Answered
How to plot a variable increasing in a for loop
If the plot should be expanded in each iteration, move the plot command inside the loop: axes('NextPlot', 'add'); % As hold('o...

1 year ago | 0

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How I can rotate cube the way that front plane will be come the top plane?
Use permute(planes, [2,1,3]) to move the 3D coordinates to the first dimension. Move the center of the body to the origin (or t...

1 year ago | 0

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Answered
Style in Matlab functions
I use the upper/lower case of the default setting: h = figure; set(h) The documentation explains, that the names and values a...

1 year ago | 0

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Arrays have incompatible sizes for this operation.
If you use a normal function instead of an anonymous function, you can use the debugger easily. function y = funy(r,theta,phi) ...

1 year ago | 0