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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.

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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) ...

12 días ago | 1

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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...

14 días ago | 1

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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...

14 días 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...

16 días 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?

19 días 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...

19 días ago | 0

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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 '...

19 días ago | 0

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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...

19 días ago | 0

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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...

19 días 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...

19 días 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...

19 días 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 ...

19 días ago | 0

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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...

19 días ago | 0

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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...

19 días ago | 1

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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...

20 días 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 ...

20 días ago | 1

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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...

20 días 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)); ...

20 días ago | 0

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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' ...

20 días 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...

27 días 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...

27 días ago | 0

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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....

27 días ago | 0

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

28 días ago | 0

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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...

28 días ago | 0

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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...

alrededor de 1 mes 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...

alrededor de 1 mes 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) ...

alrededor de 1 mes 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...

alrededor de 1 mes ago | 0

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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;...

alrededor de 1 mes ago | 1

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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,...

alrededor de 1 mes ago | 0

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