Rik

Last seen: Today | Active 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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Picking random values from an array.
k=round(numel(Data)/100); Data(sort(randperm(end,k)) This will give you a random sample of your vector.

3 days ago | 0

Answered
How to fix a callback for a checkbox
Perhaps you should have a read <https://www.mathworks.com/matlabcentral/answers/483657-how-to-create-a-gui here>. You probabl...

4 days ago | 0

Answered
Error: Too many functions when plotting series
I suspect this will do what you want: fplot(x,S1); hold on fplot(x,S2) hold off

4 days ago | 1

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how can i use table after a function?
You can make P a second output of your function. That way you can call it with the final value of L and extract what you want. ...

4 days ago | 0

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Have time object start and stop at a specific time
You need to set the delay depending on the time that the timer object is created. The number of calls can be either calculated o...

7 days ago | 0

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Answered
I want help solving differential equations
Exp is a function, not a number. There is also no implicit multiplication. My (untested) suggestion would be this: syms ...

7 days ago | 0

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Submitted

findND
find for 3D or ND

9 days ago | 16 downloads |

Answered
how to rename multiple file with sequent custom number?
You may want to consider using movefile instead. That will make this code rely only on Matlab tools, instead of being OS-specifi...

9 days ago | 0

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change an image from rectangular to square by adding white area
The documentation for padarray states it will pad with 0. If you don't want that, you will have to provide the value as the thir...

21 days ago | 1

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Index in position 2 exceeds array bounds. Index must not exceed 7?
Since i and j both range from 1 to the number of rows in f, there is no reason i+j will be less than the number of columns in f....

21 days ago | 0

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Answered
Swap k elements in an n x1 vector
Create a logical vector with at most c true elements. Then permute the values at those positions and use logical indexing to sto...

21 days ago | 0

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Each time you run the program, a new.msh file is generated
You can use the tempname function to generate a random file name. You can also use sprintf to compose a file name that includ...

23 days ago | 0

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Answered
Incorrect Inputformat for datetime function
If you remove the quotes in your input format it should work. Since there are no quotes in your input text, you don't need them....

28 days ago | 0

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How do I using logical values to write 'NAN' to non-existing data?
You can use ismember: A=[ones(5,2).*[0 2] (-90:-86).']; B=[ones(4,2).*[0 2] [-90;-89;-87;-86]]; new_B=nan(size(A)); [~,row...

30 days ago | 0

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Answered
Multiplying individual columns of a matrix
You need to index ytrain the other way around, not ytrain(:,n), but ytrain(n,:).

1 month ago | 1

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When loading .csv it separate the column on " " and not ",". How to fix this?
You should really read the documentation, which will show you how to use the 'Delimiter' option (and the NumHeaderLines option)....

1 month ago | 0

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Answered
How permutate 2-by-2 matrices in a single matrix
You're close. You just need to store a, b, and c in a cell array and use perms to create indices. The benefit of this approach ...

1 month ago | 0

Answered
Subtracting values form rows with same variable
If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks). It...

1 month ago | 0

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Answered
How do I perform a formatted read on exponential data?
Edit at the top: You can get the data in this format with my readfile function, or with data=cellstr(readlines(filename));. T...

1 month ago | 0

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Acess all last array elements withtin cells
Loops are faster than cellfun (excluding the legacy syntax). The reason is that cellfun will hide the loop internally and you ha...

1 month ago | 0

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Find the desired row in the matrix
Inspired by the answer and comment by Jan, I gave it a try as well. However, at least for this size, the answers from Jan are fa...

1 month ago | 1

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How to plot x = 1 without any y variable
doc xline

1 month ago | 0

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fprintf modifying txt file in the wrong way
If it's a sufficiently old program, it might expect a carriage return along with a line end. I would suggest reading the file...

1 month ago | 0

Submitted

regexp_outkeys
Regexp with outkeys in old releases

2 months ago | 1 download |

Answered
Error in using an element in a matrix as function input
You need to pass the entire array, or treat each element as a separate variable. You can of course create the c array inside you...

2 months ago | 1

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Answered
how do I generate a random signal with each point being -1 or +1 in MATLAB
randi([0 1],1,N)*2-1 That should do it. Or even this: sign(rand(1,N)-0.5) Although it is possible that generates a ...

2 months ago | 1

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Answered
What will be the regex for this type of string?
expr = 'V/d*_/d*_/d*'; Or, if 'any' actually means '1 or more': expr = 'V/d+_/d+_/d+';

2 months ago | 0

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Convert list of points into string and group it in tens
I would suggest putting each section in a cell, so you can easilly add the headers: points = randi(10,36,2); PointsPerSection ...

2 months ago | 0

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Answered
Diary command does not capture command window results from a script file.
Even setting a full path for the diary file didn't work. DiaryFileName = fullfile(tempdir,'myFile.txt'); diary(DiaryFileName) ...

2 months ago | 0

Answered
How to perform different task on one single button pushed one by one to perform one by one task
You can use a persistent variable to keep track of the number of times the callback was called: persistent NumberOfCalls if is...

2 months ago | 0

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