Community Profile

photo

Jan


12.527 total contributions 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.

Jan's Badges

  • Grand Master
  • Revival Level 4
  • 36 Month Streak
  • Thankful Level 4
  • Knowledgeable Level 4
  • First Answer
  • Promoter
  • Commenter
  • Solver

View details...

Contributions in
View by

Answered
Can I construct a matrix multiplying a scalar and a vector?
No, tis is not a standard multiplication. But you can create k based on i and j: i = 3; j = [4; 5]; % Solution 1: k(:, 2) ...

10 dagen ago | 1

| accepted

Answered
How can I maximize a function in Matlab?
Matlab contains some tools for minimization. A maximization does exactlly the same, if you change the sign of the optimization c...

12 dagen ago | 1

| accepted

Answered
How do I access a certain directory?
You can define the path of a file to access it: Folder = 'C:\Temp\'; FileList = dir(fullfile(Folder, '*.jpg')); for iFile = 1...

12 dagen ago | 2

Answered
how can i solve this ,can anyone provide me with code? whats wrong with my code ?
function valid = valid_date(year, month, day) % scalar positive integer limit if isscalar(year...

15 dagen ago | 3

Answered
i wanted the slope with respect to time frame
Maybe all you need is to call the gradient(X.') function, where X is the complete matrix?

17 dagen ago | 1

Answered
Efficient way to rename files adding prefix from higher rank folder
% Assuming that the Subject_folder's are contained in D:\Your\Folder\ : BasePath = 'D:\Your\Folder\'; BaseLen = length(BasePa...

17 dagen ago | 0

Answered
Save figure as jpg with 600dpi
saveas('figure.jpg') The first input must be the handle of a figure. print(gcf, 'figure.jpg', '-jpg', '-r600'); There is no '...

17 dagen ago | 0

| accepted

Answered
i am not able to debug because my window is not showing the debug points
Did you try to create the debug points by clicking in the area behind the line numbers? The file has not been saved. So save it...

17 dagen ago | 0

| accepted

Answered
How to shorten space between space in command window
Avoid the \t for formatting the output if you want to get nice ASCII tables. Prefer to define the width: fprintf('%s%10d%10d%10...

17 dagen ago | 0

Answered
If else Statement in GUI
I guess, that Matlab does exactly what it is expected to do. If h(a)*h(b)>0 is false, Matlab enters the else branch. Although y...

17 dagen ago | 0

Answered
how to resolve this "not enough input arguments" from the code shown below
objFun=@(mag)summ Now calling objFun calls summ without input arguments. I assume, you mean: objFun = @summ which is a more e...

17 dagen ago | 0

Answered
Create a for cycle over an array
Do not create a bunch of variables with an index hidden in the names: See TUTORIAL: Why and how to avoid Eval I assume all you ...

17 dagen ago | 0

| accepted

Answered
why do i get Nan as output?
Use te debugger to determine the first occurrence of a NaN. Type this in the command window: dbstop if naninf Then run the cod...

17 dagen ago | 0

| accepted

Answered
Why is vectorization faster than the parallel computing?
It depends on the problem. Parallelization is not trivial. If you use e.g. 16 cores and write the results in neighboring element...

17 dagen ago | 1

| accepted

Answered
How it works : Bilinear interpolation for image resizing
According the the documentation: "the output pixel value is a weighted average of pixels in the nearest 2-by-2 neighborhood" T...

18 dagen ago | 0

Answered
Workaround for matrix dimension error
Hints: Avoid repeated code. Prefer: brtn = 255 * get(handles.slider1, 'Value'); instead of writing 255*brtn whenever brtn is ...

18 dagen ago | 1

| accepted

Answered
how to reduce the size of checkbox
This will not work realiably. Even the OS can change the sizes of specific GUI elements. Use an uitable instead, (see Fabienne's...

18 dagen ago | 0

Answered
How to clear (not close) all the opened figures?
function clfall FigList = findall(groot, 'Type', 'figure'); for iFig = 1:numel(FigList) try clf(FigList(iFig)); ...

18 dagen ago | 0

| accepted

Answered
Calling sub-function (local function) from another file on Matlab
This would work: % main.m file: ----------- function out = main(Command, varargin) switch Command case 'sub_function' ...

18 dagen ago | 0

Answered
My code is running so long and never gives solution.
To accelerate your code, you can store the results of e.g. D1^5/pi^2 in a variable. This avoids 20 expensive power operations in...

25 dagen ago | 0

Answered
Index in position 1 exceeds array bounds (must not exceed 1).
We cannot know, what YBUS and IP_DATA is. It is your turn to check, if the error message concerns the variable e, g or f. Do thi...

25 dagen ago | 0

| accepted

Answered
Saving Tiffs from cell array using imwrite in a loop
for k = 1:numel(ca) imwrite(ca{k}, sprintf('s%d.tiff', k), 'compression', 'none'); end Prefer a naming scheme like s0001....

25 dagen ago | 0

| accepted

Answered
Merge two colums into one
Assuming that X is your matrix: C = X(:, 2); match = isnan(C); C(match) = X(match, 1);

26 dagen ago | 0

| accepted

Answered
I want to save multiple images in a folder?
See https://www.mathworks.com/matlabcentral/answers/57446-faq-how-can-i-process-a-sequence-of-files for k = 1:5 FileName = s...

26 dagen ago | 0

| accepted

Answered
Error after moving function .m file: 'Previously accessible file "...\z_estimate.m" is now inaccessible'
"saved the file in the top-level MATLAB folder instead of the subfolder "my_functions", which is also on my Matlab path" This s...

30 dagen ago | 0

Answered
From Euler Angle to Angle between 2 vectors
There is no mathematical definition of "one angle between 2 3D-bodies". There is more than 1 degeree of freedom. An angle betwee...

ongeveer een maand ago | 0

Answered
Error Index exceeds matrix dimensions
After [x ,y] = min(Data(i)); x is a scalar. Then x(i) cannot work for i > 1. By the way, as Adam has said alread, x(i)=x(i) ...

ongeveer een maand ago | 0

Answered
Coding for nested loop problem
for p = 1:10 for q = 1:10 if p ~= q ... end end end Without a for loop: x = rand...

ongeveer een maand ago | 0

| accepted

Answered
Data filtering(Give a constraint to the length of each index )
There are more efficient ways, but starting with a simple loop is a good apporach: data = [ 1 201; 1 202; 2 301; 2 313; 2 311;...

ongeveer een maand ago | 1

| accepted

Answered
Creating 1024 ToggleButtons with almost the same callback
A simplified version of your code: function buttonPress(hObject, EventData, handles) global TData brtn = get(handles.slider1,...

ongeveer een maand ago | 0

| accepted

Load more