Rik
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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MATLAB Central Community 20 Year Anniversary Treasure Hunt participant badge
Awarded to Rik on 13 Sep 2021
MATLAB Central Treasure Hunt finisher badge
Awarded to Rik on 13 Oct 2020
Contribute at least one answer each month for 36 consecutive months
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Solve all the problems in Draw Letters problem group
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Solve a community group
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Your submissions received 10 five star ratings
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Have 3 submissions connected to GitHub
Awarded to Rik on 28 Jun 2020
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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Content Feed
Unable to use a value of type 'cell' as an index
You need to unwind the call to see what's going on. When you create r_4, you have set UniformOutput to false. That means it i...
28 minutes ago | 0
Extracting every row from a matrix using a for loop
This might not be optimal, depending on what you want to do, but the size function is here to help: data=rand(23999,31) for ro...
1 day ago | 0
Loop in a string array and changing string
Why didn't you mention this is homework? (I have seen this exact situation from another user this week, so barring evidence to t...
1 day ago | 0
finding data from unique id in two tables
You can use the ismember function.
1 day ago | 1
| accepted
Matrix-vector operations without loops
You can use permute to reshape the second array and use the implicit expansion to do the multiplication in one go. Then sum over...
2 days ago | 1
There is an apparent error in line 4, and this code only ran once
t = [36, 65, 100, 160]; c = [0.145, 0.120, 0.100, 0.080]; t2 = (20:10:160); c2 = b*exp(t2*m); As you can see, you didn't def...
3 days ago | 0
Inside of a for loop. How to call another script lets say (IK.m) as Ik sub every time the loop goes to a new point?
I don't see how exactly you would end up with 6 values for each point, but if you convert your script to a function, that will m...
3 days ago | 1
save data all of in loop
No loop required: num=xlsread('ENVISAT.ex.xlsx'); num=num(~isnan(num)); num=nonzeros(num); lon=num(1:2:end); lat=num(2:...
7 days ago | 0
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Including external file is making workspace messy
Let me expand on the suggestion of @Mathieu NOE: Use functions, not scripts. Each function should have documentation explaining...
8 days ago | 1
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Create matrix using the array as index
You don't even need a loop: a=[2 2 1 0 3]; ind=a+1; A=zeros(max(ind),numel(ind)); ind=sub2ind(size(A),ind,1:numel(ind)); ...
8 days ago | 0
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deleting separate zeros from vector
It took a bit of thinking, but here is a oneliner: A = [ 0 0 1 0 0 0 1 0 1 0 0 1 5 9 8 2 0 3 0 1 0 0 0 ]; ...
10 days ago | 0
| accepted
How can I interrupt a for or while loop by pressing a button 2?
You can tell Matlab to process callbacks with the drawnow function. If you put a call to drawnow just before you reload the val...
10 days ago | 0
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Input the same value into a cell array that each cell contains different fits?
I don't think there is a way to actually avoid a loop. You can avoid a double loop like this: results=zeros(size(CellWithFitObj...
10 days ago | 0
Compare two vectors in matlab n*m
You mean like this? A=[1 2 3 4 5 6 7 8 9 10]; B=4; result=zeros(size(A));%pre-allocate L= A<B ;result(L)=1; L= A==B;resul...
11 days ago | 0
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Gui problem with workspace
Why do you want to use evalin? Just have your functions return outputs. Every function has its own workspace. To share data bet...
11 days ago | 0
How can I plot a lot of data sets quickly?
Make sure you load the data to an array instead of numbered variables. That way you can use a simple for loop and indexing. htt...
11 days ago | 0
Backward compatible functionSignatures.json
In that case my proposed solution would be implementing something like Jan suggested in his answer. Write a function similar to...
11 days ago | 1
| accepted
Utilizing sqrt and square, "Check for incorrect argument data type or missing argument in call to function 'sqrt'"
As Stephen mentioned, the sqrt function expects either single or double. So you will have to convert it to either of those data ...
16 days ago | 0
How to assign the size of a k-th column of a cell to the k+1-th?
When you execute this line: sbc{k}=size(cycles{k+1}) the k+1 element of cycles doesn't exist yet. You will have to make ...
17 days ago | 0
How to store values from nested for loop
The first step to implement a summation in Matlab is very easy: just use a for loop. It is often possible to do this with a matr...
18 days ago | 1
| accepted
How to create a matrix with nested for loop for fraction entries?
Why use loops at all? y=1; ii=0.5:.1:.7; jj=.4:.1:.6; [ii,jj]=ndgrid(ii,jj); mat=ii.*y.*jj; disp(mat)
18 days ago | 1
Having error when ploting bars with filled pattern
Download the applyhatch_plusC function from the FileExchange here and add it to your path somewhere (or your current folder). N...
18 days ago | 0
Appending a file with a string output and a numeric output
Use the 'a', 'a+', or 'A' flags in fopen to append data. This should work for text files as well. You don't really need the 't' ...
18 days ago | 1
Submitted
ifversion
Determine if the current version satisfies a version restriction
20 days ago | 3 downloads |
mex - setup FORTRAN can't install for 2017b or 2021a for windows 10
MinGW is only for C an C++, not Fortran. The linked page looks like you need the Intel Parallel Studio XE. The 2017 version s...
22 days ago | 0
why the command "figure(gcf+1)" gives error?????
The gcf get the handle to the current figure. In old releases this used to be a double, but since several years ago it has been ...
22 days ago | 0
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How to vectorize nested for loops
ndgrid will do the trick: rowsA=59; pix = 25.4/600; R = 2.5; ht = 1.5; A=abs(-rowsA:rowsA); % e.g. 5 4 3 2 1 0 1 2 3 4 5 size...
22 days ago | 0
| accepted
New. to Matlab, can you help me with the code?
A much better solution is to learn Matlab with a tutorial. You may consider doing the Onramp tutorial (which is provided for fre...
23 days ago | 1
Have problem in solution
It looks like you want different things to happen depending on the value of Erf: for every element smaller than 2 you want y to ...
23 days ago | 0
| accepted
