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# Rik

1,537 total contributions since 2017

E-mails with feedback/questions about FEX submissions are welcomed. In general I will post e-mails about Answers on the related page, unless there is good cause not to do so.

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1 day ago | 0

Distance between ALL(all combinations) points of matrix
Note that you are not calculating only unique combinations. The reason you are only getting a single value is that you are not i...

1 day ago | 0

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How to find minimum number of largest square of 1 in an 2D bool matrix
You could try a convolution with different size kernels, but I doubt that is the most efficient way to do it.

2 days ago | 0

how to convert a 3-d binary array of spherical cordinates into floating type array of cartesian cordinates
If you get my findND function from the FEX you can do this: %find 3D indices in M [r,c,p]=findND(M); %create lookup tables ...

5 days ago | 0

| accepted

b=abs([b;a(i)-a(i+1)]); error
Your loop goes up to 27, and inside the loop you look at i+1. You should let your loop go to |numel(a)-1| instead of 27.

5 days ago | 0

Why is matlab giving me a a very small number when the answer should be EXACTLY zero?
Because not all numbers can be stored as an exact binary number, some calculations will have rounding errors. %exagerated examp...

5 days ago | 1

Find and count how many capital characters are in str, and then change them to lower cases USING LOOPS
You can easily do this without loops: s = 'This is my String with CapiTal LETTERS in it. Let''s change them to lowercase uSiNg ...

6 days ago | 0

blockproc applied to ROI images
Using a nested function will allow you to share variables without having to resort to evalin. As for your actual problem: you co...

6 days ago | 0

Precise Matrix Power: A^k
It will probably be helpfull to use the Symbolic Math Toolbox, and use the tips explained here. For mod(a^b,k) there is a direct...

7 days ago | 0

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how to extract data after squeeze the matrix?
Something like this is probably what you're looking for, although it makes it more difficult to compare the same pixel over all ...

7 days ago | 0

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Return a vector with the same size as the indexing matrix/vector (code optimization)
I would have expected Matlab to have consistent behavior, but before now I hadn't bothered to look it up in the documentation. Y...

7 days ago | 1

| accepted

off figure in matlab
You need to define a group array if you want to use the off switch. The <https://www.mathworks.com/help/stats/anova1.html docume...

9 days ago | 0

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Error message: Brace indexing is not supported for variables of this type.
The uigetfile function only returns a cell array if the user actually selects multiple files. The person writing the code should...

10 days ago | 0

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WTH happened to "hold on all" in 2019b
Nowhere in the documentation could I find any mention of hold on all being a valid syntax. Before R2014b on and all had a differ...

10 days ago | 1

From a set of curves, how to find the one that the "most similar" to the reference curve?
Apart from all the 'boring' strategies of using tried and tested goodness-of-fit parameters (many of which are implemented in ba...

10 days ago | 0

Image Processing Averaging Filter
This should show you one of the multiple way to do this. %clc;clear all;%you aren't printing anything to the command window, no...

11 days ago | 0

removing NaN values from mat file
A(isnan(A))=[];

11 days ago | 1

replace element in matrix with matrix
(written on mobile, untested code) Out=cell2mat(arrayfun(@(x) circshift(eye(3),x),'UniformOutput', false));

11 days ago | 0

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For loop without repetition
Use <https://www.mathworks.com/help/matlab/ref/perms.html perms> to generate the list of all combinations and loop through the r...

11 days ago | 0

path of a mfile not on search path
As suggested in a comment <https://www.mathworks.com/matlabcentral/answers/484121-how-to-grab-message-from-command-window-and-ta...

12 days ago | 0

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How to assign each axes to hold/keep its own image?
You should never use gcf or gca in code for a GUI. As your tags indicate you're using GUIDE: use the explicit handles to the axe...

12 days ago | 1

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Checking of equality for two matrices
The difference between the isequal function and the == operator is that the second will work element by element. That means that...

12 days ago | 0

Replace this function function Xi_dot = pose_dot(t,Xi,dt,v,omega); with this function Xi_dot = pose_dot(t,Xi,dt,v,omega)

13 days ago | 1

Make an interactive plot which will allow you to draw a continuous line with 3 segments
You're only supplying single points to the plot function. If you want a line, you should first gather all the points and then ca...

13 days ago | 0

Question

How to create a GUI
There are multiple ways to create a graphical user interface (GUI) in Matlab. Which method is the best depends on multiple facto...

14 days ago | 2 answers | 3

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Hide and change location of pushbutton in GUI?
You can set the Position property of a uicontrol object to move it to any location you like inside the callback that sets the Vi...

14 days ago | 0

| accepted

Submitted

RegGrow
Region growing algorithm (supports 2D, 3D, and ND)

Submitted

maximize
Maximize the figure window (multiple strategies implemented)

Can I get the MATLAB software for 32 bit I need that
You will need to download R2015b or older. Newer releases don't have a 32 bit version. You should be able to select older releas...

16 days ago | 0

| accepted