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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Find the nearest two values in all grid cells to a specified value across a 3D matrix
Why squeeze the indices? Just use them to index (for which you need sub2ind). As for the second closest: the easiest way is to ...

1 día ago | 0

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Answered
Calling the error function does not print the line number in r2022b
I personally use my own customized versions of error and warning. They take an options struct as the first argument to determine...

1 día ago | 0

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Pseudorandom character matrix generation
If you want a 10x10 char array, you can also use indexing: source = 'bdpq'; Array = source(randi(end,[10 10]))

1 día ago | 0

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If not with a xlsx file
You should have used isempty in your current code: if ~isempty(app.filename) For the test you now want to do, you should extra...

2 días ago | 0

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Saving file causes glitch
As a temporary workaround you can use this: edit my_script.m % should give you a popup asking if you want to create the file O...

3 días ago | 0

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Fitting data from file
You can specify those parameters, but what is much more effective is providing good initial guesses (and not mixing up x and y):...

3 días ago | 1

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get alpha (color) value of a line
I have no clue why this is hidden, but converting the object to a struct and hunting for a few appropriate candidates I found th...

3 días ago | 1

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Appending mixed types to strings seems a bit tricky. Is this the intended behaviour?
It helps to do this step by step, which show that (while unintuitive), this is intended behavior. Matlab evaluates code from le...

3 días ago | 3

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How to assign matrices to an array in a for loop
You can use a cell array: for i = 1:5 matrices{i} = [i*1 i*2 i*3; i*4 i*5 i*6; i*7 i*8 i*9]; end

4 días ago | 1

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Answered
APP Designer code convert to CPP code
Do you need to generate the C++ code, or is it also fine to end up a stand-alone executable? As the message indicates, UIFigure...

8 días ago | 0

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Difference between "||" and "&&" in my loop
The or operator means and/or, just like it does in mathematics. You can use the xor function (although no operator or short-circ...

8 días ago | 0

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How to reduce the file size of a saved histogram figure
You have two options that I'm aware of: # Change the underlying data so you reproduce the same bins with fewer data points. ...

10 días ago | 1

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Computational cost of the commanda 'path'
Once you are at the stage where the profiler makes any sense at all, you should question why you are still using scripts instead...

10 días ago | 0

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Answered
Change exp from number to e
Your own suggestion actually works (although it requires a call to simplify): syms c1 c2 y(x) f(x) e y(x) = (e^2/(e^2+1))*e^(-...

11 días ago | 0

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confusion matrix with string greek letters like alpha and beta
If you use the actual greek letters, that should work (as long as the function supports all implemented characters): text(1,1,c...

14 días ago | 0

Submitted

ifversion
Determine if the current version satisfies a version restriction

14 días ago | 2 downloads |

Answered
reading files that contain changing parts and parts that need to be ignored
You need to use dir to find the actual file name matching some pattern. Then you can provide the function with the real file nam...

14 días ago | 0

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Answered
negative positive sign matrix B need to follow matrix A
The sign function seems an obvious choice: A=[ -1 3 -2 4 6]; B=[2.1 2.2 4.2 4.5 5.8]; C=sign(A).*B sum(C)

15 días ago | 2

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How to generate repeatable random multiple vectors with Specific Number of Values and Fixed Sum?
You should try to restructure your problem to make it fit the tools you already have. If we figure out a way to generate an ord...

15 días ago | 0

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Rotate an image around centroid without deformation
I'm not a fan of using i as a variable name, nor do I like shadowing the image primitive with a variable. Other than that, read...

15 días ago | 1

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How to format wkt (well known text string) as a normal string to build a webread input?
I suspect you need to apply percent encoding, as URLs are not allowed to contain spaces.

16 días ago | 0

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How to generate random Patient ID numbers?
The save function has two modes: saving variables and saving a struct. The easiest way to solve this error is to store the da...

17 días ago | 1

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how to minus a sequence value
The diff function will do what you want. You can use abs to get the absolute value.

17 días ago | 0

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Can MATLAB control a website and extract data from it?
My suggestion would be to look at the network tab of your browser's debugging tools to find out from where that data is loaded. ...

21 días ago | 0

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How to Convert data into Image using Matlab
The shape did not actually change. You just expanded the y from [-2 18] to [0 1000]. S=load(websave('tmp.mat','https://www.mat...

22 días ago | 0

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How do I access a .m file in a subfolder?
If you want the read the file as text: You can use a relative path: txt=fileread(fullfile('Workspace','constants.m')); You ca...

25 días ago | 0

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Hide licensee first name
You can change your username, which is what is actually displayed.

26 días ago | 0

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how does "[x,y] = WindowCenter(window)" work
The documentation for that function is terrible. Let that be a lesson for when you write your own function. This help text is co...

29 días ago | 0

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Min and Max values and corresponding x/y values
You should use the second output of the min function to return the linear index of the position with the lowest value. Since yo...

29 días ago | 0

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there is an error in describing the loop, please help me to resolve this one.
If you're not planning to do anything with the intermediate values, why would you store them? init % Runs the first part of you...

alrededor de 1 mes ago | 0

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