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Rik


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1.623 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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Answered
You will be estimating the number of swaps required for a list that is X=100, 200, 300, ..., 900, and 1000 numbers long. In other words, you will calculate an average for each number from 100 to 1000 in steps of 100. Each average should be calculat
You probably want to use randperm to generate the random list. If you don't want to, you should preallocate the x vector and fil...

alrededor de 4 horas ago | 0

Answered
"Undefined function for input arguments of type 'char'" but the function is designed to take chars.
Generally the errors for functions that you have written yourself will not be this descriptive, unless you make them this descpr...

alrededor de 5 horas ago | 0

| accepted

Answered
If a variable holds a bunch of images, what does (:, :, 1, i) mean?
In the case of a 3D array, the last dimension is generally the z direction, although it can also be the different color channels...

5 días ago | 0

Answered
Add legend to multiple plots created by a for loop
There are two ways to do this. Either you need to create an array of the handles to the scatter objects and use that in your cal...

5 días ago | 0

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Answered
Help with centralling text values above a Bar Chart with side by side data
Find the x position of the bar itself and use that in your call to text. Then you can set the HorizontalAlignment to center.

15 días ago | 0

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Answered
How to apply thresholding at different parts of an image?
What you describe is a region growing algorithm, of which you can find an implementation <https://www.mathworks.com/matlabcentra...

16 días ago | 0

Answered
How to add white space to the left and right of my plot?
Use the axis function to set your axis limits, or use the xlim function to set the XLim property of your axes object.

17 días ago | 0

Answered
Is this a valid expression?
You can't index the output of the transpose function like that. You can either do it explicitly in multiple steps, or use the fu...

17 días ago | 0

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Answered
How to obtain a square matrix from a column matrix
So like this? AA=repmat(A,1,9);

17 días ago | 0

Answered
need help to plot a mesh
Use meshgrid to generate the full grid of combinations of x and alpha. Then you can use the surf function.

17 días ago | 0

Answered
question on triangulate() function
I don't see any reason why it would matter (as long as you use the same coordinate system for both inputs and the stereoParamete...

19 días ago | 0

Answered
Is it possible to print hard copy of PDF file using MATLAB
If you can manage to read the pdf in Matlab and make it your current figure, you can actually use the print function. See this p...

19 días ago | 0

Answered
How can a particular .tif file be read from a folder which is having 10 files with different suffix like 'file_1', 'file_2'...?I only want to read file_2.tif and file_4.tif.
You can generate the list of file names with dir: filelist=dir(fullfile(folder,'*_*.tif')); Now you can optionally loop throug...

23 días ago | 0

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Answered
How can I see the all results at the same time according to changing values in a "for" loop?
Store the results in an array. Don't use numbered variables, you will either have to type them out (increasing the risk of typos...

23 días ago | 0

Answered
why is my code ignoring my while loop
You shouldn't use logical arrays as your conditional. It will never do what you think it does. This is what it does: IF=@(cond)...

alrededor de 1 mes ago | 0

Answered
import data and plat a 3D
No interpollation required, just a conversion to a 2D matrix. You can adapt the syntax of accumarray if you do have any missing ...

alrededor de 1 mes ago | 1

Answered
Calling a function defined in a m-file from within appdesigner app, with the app object as function input
Your GUI (like all AppDesigner GUIs) has a pass-by-reference behavior (so it behaves like a handle class). That means the line y...

alrededor de 1 mes ago | 1

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Answered
Saving/loading large images fast
I think it would be faster to load the data and recreate the figure. In general savefig only makes sense if you have a large num...

alrededor de 1 mes ago | 0

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Answered
Combine 2 images vertically
Like this? Im2=cat(1,im_upper,im_lower);

alrededor de 1 mes ago | 0

Answered
hex2num can't recover value from the hex by num2hex
As the documentation explains, hex2num assumes the hex is a representation of a double, while num2hex also supports the single d...

alrededor de 1 mes ago | 0

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Answered
Selection of roi for multiple images
If you want to apply the same ROI to all images: export the ROI as a logical array. If you want to select a different ROI for...

alrededor de 1 mes ago | 1

| accepted

Answered
How to make program window and figure centered using GUI and varargout = guidefunc(action, varargin).
Since it apparently solved your issue, I'll move my comment to the answer section: As you can see in the first screenshot the U...

alrededor de 1 mes ago | 0

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Answered
how can i put a limitation rules for below codes?
With logical indexing it is easy to remove impossible values: Pmax= 3600; Pmin=0; Pch=[2600 2750 2800 2950 3010 3100 3300 3...

alrededor de 1 mes ago | 0

Answered
Error using fprintf when copying cell content into a text file
The code below works, but it is probably better to define your FormatSpec in such a way that you can print your data line by lin...

alrededor de 1 mes ago | 1

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Answered
Divide the matrix randomly, based on columns
You mean like this? fractions=[70 15 15]; x=rand(78000,100);%use 100 to show the split is indeed 75:15:15 groups=cell(size(...

alrededor de 1 mes ago | 0

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Answered
Looping Factorial that adds successive terms
You should have just shown the last line. I first spent quite some time finding the correct method of implementing your non-desi...

alrededor de 2 meses ago | 0

Answered
Can someone give an easy explanation for what hObject is and what handles is in MATLAB GUI?
In GUIs that are generate by GUIDE, every callback has 3 arguments: hObject: the handle to the object that generated the callba...

alrededor de 2 meses ago | 1

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Answered
Lookup-scheme for potentially large n choose k matrices
If the citeria below are satisfied, you can use memoize: Performance is important. The function is time consuming. The functi...

alrededor de 2 meses ago | 1

Answered
Name arrays based on a variable
The reasons why naming variables dynamically can be found here. It sounds like you are looking for the features a struct will pr...

alrededor de 2 meses ago | 0

Answered
To make coding simplier and have the same plot
You could vectorize this, but using a loop is much easier and will probably have the same performance. Here is an example for t...

alrededor de 2 meses ago | 0

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