Rik
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2.589 total contributions since 2017E-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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MATLAB Central Treasure Hunt finisher badge
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Contribute at least one answer each month for 36 consecutive months
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Answer 10 questions that were unanswered for more than 30 days
Awarded to Rik on 10 Jun 2018
Solve all the problems in Draw Letters problem group
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Solve a community group
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Solve all the problems in Indexing I
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Solve all the problems in Cody Challenge
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Solve all the problems in Introduction to MATLAB problem group
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Awarded to Rik on 13 Jan 2021
Naming variables from one column Import file
Don't store data in a variable name. You should use cell arrays or fields of a struct instead.
etwa 17 Stunden ago | 1
how can i convert an answer from an inputdlg into a matrix ?
While you could solve it like you suggest, a much better idea (in my opinion) would be to use uigetfile. file = uigetfile opens...
ein Tag ago | 0
Graphing data from a .txt file giving error and inaccurate data
You should probably read the file once and then parse the data. I cropped your file, because I don't think the entire thing is r...
ein Tag ago | 1
F=Kff*uf - Matrix operation
You were almost there: F = [383.02; 321.39; 0;]; Kff = [634.8 -191.2 -353.6; -191.2 447.3 353.6; -353.6 35...
2 Tage ago | 0
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Merge binary images and smooth the edges
I'm not getting as smooth as your example, but this should do as a first approximate. IM=imread('https://www.mathworks.com/matl...
2 Tage ago | 0
Turn off "Improve MATLAB by sending user experience" from the command line
Using a function to unwind the settings (casting them to struct), and using comp_struct from the FEX, I found the relevant setti...
2 Tage ago | 1
x,y coordinates of text
You can use the Extent property of the text object to find the corners of your text area. The only thing left to do for you is t...
2 Tage ago | 1
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blood vessel segmentation in retinal images
You ran the function without any inputs. You will have to call it with an input, e.g. like this: IM=imread(fullfile('Test Image...
3 Tage ago | 0
how can i find and mark indexes on my data?
The answer is already in your question: you should use the find function on your mci array. For clarity, here are the content...
4 Tage ago | 0
How can I set the table parameter in .txt output
Because you didn't tell Matlab to use 2 spaces in the FormatSpec. Compare the two versions below (the second line is to provide ...
4 Tage ago | 0
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Saving .wav file
You're overwriting the song every time this callback is triggered. You should probably store each note to a field of your guidat...
4 Tage ago | 0
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Explanation of "Position" in uitable
Since the units are set to Normalized, the units of the Position property are a percentage of the parent object (generally a fig...
4 Tage ago | 0
find previous value in column before specific set value and delete all others
You can use find to create a vector of indices. data=[182 0 195 13 197 2 207 10 210 3 219 9 222 ...
9 Tage ago | 0
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insert variable k value into new variable names
Yes: k=1; on{k}=imread(sprintf('on_%d.tif',k)); on{k}=double(on{k}); figure; imshow(on{k}); The main point is to use a cell...
10 Tage ago | 0
How to get specific columns from a csv file and get its average and standard deviation?
Often the answer to 'how to do this' is: break your problem into solvable steps. You need to read your data from a file to a Ma...
13 Tage ago | 0
I would like to compile a text string for each one of the three index of two given arrays
Easy with sprintf: XX=[1,2,3]; YY=[3,2,1]; z=repmat("",size(XX)); FormatSpec='&DEVC ID=''vel_%d'', QUANTITY=''VELOCITY'', AB...
14 Tage ago | 1
Fill in a matrix after an evaluation
I guess boldly: x0_r=rand;y0_r=rand;z0_r=rand; target=rand(6,76+3); accuracy_right = zeros(76,6); for i = 1:1:76 data...
17 Tage ago | 0
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How can i convert this string into an input for a function?
ch=['MRWI' 'IDMZ' 'CGBI' 'JKNO']; v=ch.';v=v(:).'; disp(v)
19 Tage ago | 0
error in function that in my version work correctly but in another version work incorrect
You didn't send them a function, but a script. Since R2016b you're allowed to put functions in a script file. The solution is t...
20 Tage ago | 0
| accepted
Finding 4 closest points
You can design something yourself, but you could also see if fillmissing solves your problem. The documentation suggests it shou...
20 Tage ago | 0
Setting Access Properties to Public without AppDesigner
As you can see <https://www.mathworks.com/matlabcentral/answers/483657-how-to-create-a-gui#answer_412887 here>, class properties...
20 Tage ago | 0
| accepted
How to calculate the center of white part?
The best way is to use something like regionprops, but since you only have a single patch, you can use find to get a list of coo...
22 Tage ago | 1
| accepted
how to plot a function
The same as any other function: find a vector of x data and calculate the y data. Then you can use plot. You can use plot3 for x...
23 Tage ago | 0
Nominate yourself to become a member of MathWorks Community Advisory Board
You can find the current members of the MATLAB Central Community Advisory Board on this page. At the bottom of that page, you c...
24 Tage ago | 0
Use API in matlab
You're in luck: NASA decided to provide the data in JSON, and Matlab can parse that JSON output for you: url='https://power.lar...
24 Tage ago | 0
Deployed exe with configuration file
It sounds like you need something very similar to my GetWritableFolder function. You can use the second output to confirm the f...
24 Tage ago | 0
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simple calculator using GUI
For general advice and examples for how to create a GUI (and avoid using GUIDE), have look at this thread. Every callback is a ...
24 Tage ago | 0
| accepted
How I can optimize my code for a stack construct?
Dynamically growing a variable is generally slow, because Matlab needs to copy the entire array. You could pre-allocate a stack...
24 Tage ago | 0
Subset of an array with a moving window
The code below relies on implicit expansion to create an index array, which replicates the results from the inner for-loop. Sinc...
27 Tage ago | 1
| accepted
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