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Jan


12.533 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
MEX passing Integer - wrong results
This sounds magic. Whenever magic things appear in discussions in the forum, or at programming in general, it is a secure signal...

2 días ago | 2

Answered
how to avoid for loop
A ,ore efficient version of the loop: nb = numel(b) - 1; counts = zeros(1, nb); % Pre-allocation!!! for i = 1:nb co...

8 días ago | 0

| accepted

Answered
Using matlab to find vectors that are orthogonal to another vector.
Do you mean 2D vectors? v = rand(1, 2) % Any test vector vp = [-v(2), v(1)] dot(v, vp) % Orthogonal means: dot pro...

8 días ago | 0

| accepted

Answered
11221 212211 212 12 1
Please post an exact copy of the error message in the forum. A rough paraphrasing will hide important details. Thanks. I assume...

8 días ago | 0

Answered
faster way to add many large matrix in matlab
The main time is spent in rand() in your example. With using ones() instead, the runtime goes from 0.71 sec to 0.25 sec on my ma...

11 días ago | 0

| accepted

Answered
Convert CurrentPoint to X and Y Value.
I guess that you do not want the coordinates relative to the figure, but relative to the data in an AXES object. Then: CP = get...

11 días ago | 3

Answered
P files cannot be analyzed to find their dependencies. Please add P file dependencies manually
I'd start with a web search: Ask your favorite search engine for "Matlab get dependencies of P file". You will find e.g.: https...

alrededor de 1 mes ago | 2

| accepted

Answered
Is it possible to concatenate structures with the same fields in to one super structure?
Or with a loop: function S = CatStructFields(S, T, dim) fields = fieldnames(S); for k = 1:numel(fields) aField = field...

alrededor de 1 mes ago | 3

Answered
Query in applying If command
if (abs(G(j)-O(:))<1) The if command needs a scalar condition. Therefore Matlab inserts an all() to evaluate the vector G(j)-O(...

alrededor de 2 meses ago | 0

Answered
Index in position 1 exceeds array bounds (must not exceed 5).
The variable tab has the dimensions 5 x 10. You try to access the indices [100, 5, 10]. This cannot work. I guess, you want to r...

alrededor de 2 meses ago | 0

Answered
How to Assign vectors to each dynamic variable name?
Don't do this. See: TUTORIAL: How and why to avoid Eval Hiding an index in the name of variables is a bad idea. Use arrays ins...

alrededor de 2 meses ago | 3

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) ...

2 meses 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...

2 meses 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...

2 meses 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...

2 meses 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?

2 meses 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...

2 meses 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 '...

2 meses 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...

2 meses 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...

2 meses 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...

2 meses 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...

2 meses 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 ...

2 meses 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...

2 meses 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...

2 meses 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...

2 meses 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 ...

2 meses 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...

2 meses 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)); ...

2 meses 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' ...

2 meses ago | 0

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