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Rik


Last seen: Today
2.550 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
find the row and column value of a specific value in cell array
You need to use a bit of trickery to use find (ismember will not work normally either). cellarr = {... 'a','b','c', 3 ,5;....

alrededor de 15 horas ago | 1

| accepted

Answered
Write and format table to csv file
You can use formattedDisplayText (which was introduced in R2021a). (see this highlight for an extra example) For older releases...

alrededor de 18 horas ago | 0

Answered
How do you check if an inputed number is an array/vector or just 1 value?
In my view using numel or isscalar (introduced somewhere between v6.5 and v7.1) would be a better solution. xscalar = numel(x)~...

1 día ago | 0

Answered
Help with if statement in a calculation loop
The problem is that you assume Matlab will process each element of x separately. Matlab will only do that if you use a loop. ...

1 día ago | 0

Answered
Can I open a file made in R2019a with different versions of matlab (R2017b)?
This depends on what kind of file you're talking about. mat files and m files are very portable, especially if you leave the def...

5 días ago | 0

| accepted

Answered
Comparing values of a vector
This is the easiest way to do it vectorized: Zc_0_to_P =@(x) (M/P^2)*(2*P.*x - x.^2); % 0≤x≤P Zc_P_to_1 =@(x) (M/(1-P)^2)*((1-...

5 días ago | 0

| accepted

Answered
Version number 2021a Version='9.10' is confusing. Why not using '10.0'
Versioning is a complex and hotly debated topic. Generally you want to increment the first number if you have a really big upgra...

6 días ago | 0

| accepted

Answered
Assign date values manually to datetime array matlab
For pre-R2020b, you can use readfile, which you can get readfile from the FEX. If you are using R2017a or later, you can also ge...

6 días ago | 1

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Answered
courbe de progression du pixel
%load an example image S=load('mri'); I=squeeze(S.D); x=randi(size(I,1));y=randi(size(I,2)); intensity=squeeze(I(x,y,:)); ...

6 días ago | 0

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Answered
modify a program to obtain the same result from right to left
Your loop can probably be replaced by a vectorized operation, but I will leave that for you to figure out. I suspect fliplr and ...

7 días ago | 0

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Answered
How to use output numbers as a vector.
There are may sorting algorithms you could implement. One of the easiest to implement (and one of the slowest) is called bubble ...

8 días ago | 1

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Answered
When I attempt to run this it produces an 'error using zeros, size inputs must be integers' for the line DcDt = zeros(n,1). The code is supposed to produce a breakthrough curve. Any help is appreciated.
L is not defined. If it is smaller than 0, this will lead to z being empty, meaning that n is 0. L=-1; z=0:0.001:L; numel(z) ...

8 días ago | 0

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Answered
Displaying an array of zeroes.
doc fprintf

8 días ago | 0

Answered
Evaluating function on an array of values
There are several problems here. The main one is that you are using matrix operations instead of element-wise division. In this ...

9 días ago | 0

| accepted

Answered
Saving data to current date
doc datetime

9 días ago | 0

Answered
Using student license on more than one computer
Since a student license is a personal license (and only allows installation on 1 computer), there are two problems with your pla...

12 días ago | 0

Answered
str2num returning value while the preferred str2double returning NaN...
This is another difference: str2double('evalc(''exit'')') str2num('evalc(''exit'')') %will exit Matlab You should parse the ...

12 días ago | 0

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Answered
Is it possible to vectorize this simple recursive function in loop?
Vectorization should only be attempted if there are more direct functions. Otherwise, for loops in Matlab are surprisingly optim...

13 días ago | 3

Answered
Writing data from GUI handles to text file
(the advice I wanted to post became a bit long, so I will put it in an answer instead of a comment) My general advice for writi...

15 días ago | 1

Answered
How to create legend with multiple variables in a loop ?
You should put the figure creation and the creation of the legend outside the loop. You are merging the two texts, but you sh...

15 días ago | 0

Answered
Adding a cell to another cell in a specific position
What do you mean exactly by adding? %create some data n=3;m=5; A=num2cell(1:n).'; B=num2cell(2*n+(1:m)).'; %option 1: A1...

16 días ago | 0

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Answered
remove cell values of a column vector not contained in another column vector
doc ismember And maybe setdiff will do the trick as well.

18 días ago | 0

Answered
For loop in a for loop
You are resetting b in your loop, so only the last value of k matters. And the middle loop isn't a loop, as it is a scalar.

18 días ago | 1

| accepted

Answered
plot all roots of a polynomial which has a interval coefficient
I meant something like this. N=200; Z=NaN(N,3); a=linspace(2,3,N); for n=1:numel(a) p=[1 a(n) 1 1]; z=roots(p); ...

21 días ago | 0

| accepted

Answered
Unable to select seed points manually in region growing algorithm
getpts will return decimal values, so you will have to use round. I= rgb2gray((imread('TM25.jpg'))); figure,imshow(I) [x,y]=g...

21 días ago | 0

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Answered
Out of memory. The likely cause is an infinite recursion within the program.
Inside the function trans you are calling the function trans. Without any logic to stop this, this will result in an infinite lo...

21 días ago | 0

Answered
Is there a way to call a part of a function using an index?
Reposting as answer: For the reasons set out in the answer by Steven (and the subsequent comments), numbering your variables in...

21 días ago | 0

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Answered
check for a pair in power hand
The feasibility of this depends on the size of the arrays involved. If your vectors are too large, the implicit expansion will c...

22 días ago | 0

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Answered
R^2 meaning in linear mixed-effects model
The information you seek should be available on the Wikipedia page for the R². This is one of the most basic goodness-of-fit pa...

22 días ago | 0

Answered
Dividing the string data
You can split this with a regular expression. str='68753-9.990e+000 -9.900e-002 -9.990e-003-3.330e+000'; RE=['[+-]?',... %s...

23 días ago | 0

| accepted

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