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Group values of a vector into new vectors according to magnitude
A = [17 323 100 3 278 220 45 351 212 51]; Y = discretize(A, [0, 50, 100, 360]) C = splitapply(@(x) {x}, A, Y)

4년 초과 전 | 1

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How to convert to a parallel program?
Pre-allocation is essential. Do not let array grow iteratively, but create them with the final size: n = 41; h = 1 / (n...

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How to select every 54th image in the folder?
A = 'D:\Your\A'; B = 'D:\Your\B'; AList = dir(fullfile(A, 'a*.jpg')); BList = dir(fullfile(B, 'b*.jpg')); nB = numel(BLis...

4년 초과 전 | 1

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Multiply cell by cell
Use a loop: for k = 1:numel(C_inside2) C_inside2{k} = C_inside2{k} .^ 2; end This is faster than cellfun: C_inside2 = ce...

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How can I speed up (or avoid) a comparison in for loop?
What about omitting the loop: A(ismember(L, f)) = true; Or: LUT = [false, N < threshold]; A(LUT(L + 1)) = true;

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downsample data adapively/"intelligently"
This is not a trivial problem. In the general case it is a global optimization problem and there can be a huge number of equival...

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Speed Up the for loop
Fmt1 = '%6.2f \t %6.4f \t %6.4f\t %6.2f \t %6.2f \t %6.2f \t %6.2f'; Fmt2 = '%s \t %6.2f \t %6.2f \t %6.2f \t %6.2f \t %6.4f \t...

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Error while recording using audio recorder object
record_file=getaudiodata(recorder); ffname = sprintf('%s%s',record_file); getaudiodata replies a numerical array with the sign...

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What should go in a next-generation MATLAB X?
A complete list of changes for each command. Currently we find "introduced in Rxy" already, but modifications of inputs and out...

4년 초과 전 | 8

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Avoid ode15s from freezing in parameter optimization
I've limite the time to [0, 15]. You see that one component explodes between t=15 and t=16. This let the step size of the integr...

4년 초과 전 | 0

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How increase calculate speed in for loop
Start with a simplification of the code: Depth = 5000; Num_Alines = 400; Num_Bscan = 300; Alines = 180 h ...

4년 초과 전 | 0

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How to add integers without correction?
a = int8(126); b = int8(2); tic for k = 1:1e4 c = bitadd1(a, b); end toc tic for k = 1:1e4 c = bitadd2(a, b);...

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Solving a System of ODEs using Euler's method
Your function to be integrated depends on t also. You call this x in the Euler method. At is easier to use vector equations: f...

4년 초과 전 | 0

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Matlab versions supported on Windows 11?
Windows 11 have not been officially released yet. We and MathWorks cannot know how the final version will work. There have been ...

4년 초과 전 | 0

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How to Copy Upper diagonal elements of matrix A into a new matrix.
A = [1 2 3 4; 2 1 3 4; 1 1 1 2; 1 0 0 1]; B = triu(A)

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why are some integrals not solvable in matlab?
Is it a numeric or symbolic integration? Most functions do not have a closed form integral. This is a mathematical limitation. ...

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Diagonals in Matrices Matlab
I'm not sure if I can follow your explanations. A short example might be useful. The term "be -.25 for every 2 instances" might...

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I have 2011a on my machine. I installed 2014a. it is always running MATLAB2014a, how to select MATLAB2011 for running please?
How do you start Matlab? The exact method to start a specific Matlab version depend on the operating system. But the way is to i...

4년 초과 전 | 0

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Trying to use a for loop to calculate years with an IF statement but it seems to ignore it.
Either for M = 2:300 if balance(M) >= 50000 %balance(M) break; % Leave the for M loop end % NOPE ! M =...

4년 초과 전 | 0

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How to plot a smooth curve with only a few points?
Either decide for a linear interpolation: x = 1:6; y = rand(1, 6); plot(x, y, 'ko'); hold on xx = linspace(1, 6, 100); ...

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Is rsqrt the same as Fast inverse square root?
i = * ( long * ) &y This is equivalent to: y = single(pi); i = typecast(y, 'int32'); The shown code of Q_rsqrt is an ap...

4년 초과 전 | 0

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I am getting Undefined function or variable 'A', error in Untitled line 95
The variable A should be polulated in this line: A(rr,:,z) = [sod,rangeL1,rangeL2]; If A in undefined, this line was not c...

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ODE45 is taking hours and hours to compute
Symbolic omputations need a lot of time. Can you implement the code numerically? If the equation to be integrated is stiff, ODE...

4년 초과 전 | 0

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semilogy, loglog do not work in order to set the y axis on a logarithmic scale
After figure, hold on the YScale is determined already. Define it explicitly instead and you plot(): figure axes('yscale', 'lo...

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About 3 significant digit?
fprintf('%.3g\n', pi) fprintf('%.3g\n', pi * 1e6) fprintf('%.3g\n', pi * 1e-6)

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"Too many output arguments" error while working with the fmincon solver inside the optimization tool.
A bold guess: [solution,objectiveValue] = fmincon(@objectiveFcn,w,[],[],[],[],[],[],... @objectiveFcn,options2); % ^^^^...

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Arithmetic coding and Huffman
https://www.mathworks.com/help/comm/ref/arithenco.html https://www.mathworks.com/help/comm/ref/huffmanenco.html Man further c...

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Calculation of the average of 80X80 blocks of 800X1280 Excel sheet data
Import the data. Then you have a [800 x 1280] matrix. It does not matter, if the data have been stored in an Excel file. Then: ...

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Build array from for loop
n = 100; c = cell(1, n); for k = 1:n c{k} = rand(1, randi(10)); end result = cat(2, c{:}); This avoids an iteratively g...

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Nested struct arrays with variable format
You can't. S = struct('Name1', cell(n1, 1), ... 'Name2', cell(n1, 1)) his creates a [n1 x 1] struct array with two...

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