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.

Statistics

All

View badges

Content Feed

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...

19 hours 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...

19 hours 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...

19 hours ago | 1

| accepted

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....

19 hours 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...

1 day 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...

1 day 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 ...

2 days 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) ...

2 days 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...

2 days 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...

3 days 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)

3 days 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...

3 days 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...

3 days 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...

3 days 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;

3 days 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...

3 days 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...

4 days 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...

4 days 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...

4 days 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...

6 days 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 ...

6 days 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);...

6 days 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...

6 days 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 ...

6 days 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)

6 days ago | 0

| accepted

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. ...

6 days 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...

7 days ago | 1

| accepted

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...

7 days 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 =...

7 days 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); ...

7 days ago | 0

| accepted