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Jan


Last seen: Today Active since 2009

It is easier to solve a problem than to guess, what the problem is.

Questions about FileExchange submissions are welcome - get my address from the code. I do not answer mails concerning questions in the forum.

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Answered
How to suppress anonymous function handle being created?
As usual the created variable is not shown, if you append a semicolon ; after the command. a = @(x) sin(x) % Output: b = @(y...

31 minuter ago | 1

Answered
Convert a jpg graph into matrix arrays
This is not possible. Saving the data with the low screen resolution to a jpeg removes the possibility to access the data in a h...

ungefär en timme ago | 0

Answered
removing some the elements in cell array
for k = 1:nunel(data_array) data_array{k} = data_array{k}(4:5); % or = data_array{k}(4:end); % Or: % da...

ungefär en timme ago | 0

Answered
How do I pass a filename to a routine in Matlab's command window?
The error message is clear: The file does not exist. Although you assume, that the current folder is the same, this is not true....

ungefär en timme ago | 0

Answered
How to put uigetfile data from Pushbutton into Listbox?
I'm not sure what you want to achieve. With some guessing: function loadekstrak_Callback(hObject, eventdata, handles) % hObjec...

ungefär 20 timmar ago | 0

| accepted

Answered
Performance difference between loop and recursion in fibonacci sequence
A cleaner version of your loop uses a pre-allocation of the output: function y = fibor_loop_2(n) y = zeros(1, n); % Pre-alloc...

ungefär 20 timmar ago | 1

| accepted

Answered
Changing the range of for loop give different result
You cannot create a matrix, whose elements are matrices. This works with a cell array: A = cell(r+1, k+1); for i = 2:r+1 ...

en dag ago | 0

Answered
Matlab如何将cell中的矩阵进行合并?
R = {[3;2], [3;5], [4;2], [4;5], [5;2]}; nR = numel(R); f = true(1, nR); for iR = 1:nR if f(iR) ...

en dag ago | 0

Answered
separate strings that are inside a cell
Your description is not clear yet. I dare to guess: % Input (thanks Adam): C = {"sdfsd"; "dare"; ["abs";"ses"]; "erwe"; "serwe...

en dag ago | 0

| accepted

Answered
error using "fread"
cd('E:/image_trans/Emis32_%d.bin'); This does not look like a valid folder name. Is there really a % character? Later on this i...

2 dagar ago | 0

Answered
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)

2 dagar ago | 1

Answered
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...

2 dagar ago | 0

Answered
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...

2 dagar ago | 1

Answered
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...

2 dagar ago | 0

| accepted

Answered
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;

2 dagar ago | 1

| accepted

Answered
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...

2 dagar ago | 0

| accepted

Answered
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...

3 dagar ago | 1

| accepted

Answered
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...

3 dagar ago | 0

| accepted

Answered
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...

3 dagar ago | 2

Answered
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...

5 dagar ago | 0

Answered
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 ...

5 dagar ago | 0

Answered
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);...

5 dagar ago | 1

Answered
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...

5 dagar ago | 0

Answered
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 ...

5 dagar ago | 0

Answered
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)

5 dagar ago | 0

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Answered
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. ...

5 dagar ago | 0

Answered
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...

6 dagar ago | 1

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Answered
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...

6 dagar ago | 0

Answered
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 =...

6 dagar ago | 0

Answered
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); ...

6 dagar ago | 0

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