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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I have a code but it keep saying "invalid expression. when calling a function or indexing a variable, use parentheses. otherwise check for mismatched delimiters.
The reason is these two lines: xx1=(0,8.*pi,1000) x3=(-4,4) Did you maybe forget linspace? Anyway, this isn't valid Matlab s...

3 hours ago | 0

Submitted

regexp_outkeys
Regexp with outkeys in old releases

4 hours ago | 2 downloads |

Answered
why \pi don't work??
Why did you expect it to? This isn't LaTeX. If you want the pi symbol in a character vector that is possible: char(960) Or yo...

14 hours ago | 0

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arrays have incompatible sizes for this operation help me PLZ
I have removed all the plotting code and included calls to size to determine the sizes of all the variables involved. data_size...

3 days ago | 0

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How can I load .mat files?
Or: matfilenames={'Datasets/a.mat','Datasets/b.mat','Datasets/c.mat'}; for k = 1:3 S=load(matfilename{k}); fields=fi...

3 days ago | 1

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Answered
How to fix "Error using == Arrays have incompatible sizes for this operation." in this code?
Let's have a look at the line that results in an error: n1=(sum(x.*y)-length(d)*mean(x)*mean(y))/(sum(x.^2)-length(d)*(mean(x)*...

3 days ago | 0

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The Problem with clc; clear; close all; ?
My main point is that people will get into the habit of using this, and will also use it in functions. Clear is almost never ...

4 days ago | 0

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Stop using suggested word on right arrow
I just checked for you: If you go to the preferences (in the 'Home' tab), you can disable the automatic completions in the MATL...

4 days ago | 1

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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...

4 days ago | 1

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Answered
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...

5 days ago | 0

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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...

6 days ago | 0

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finding data from unique id in two tables
You can use the ismember function.

6 days ago | 1

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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...

6 days ago | 1

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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...

7 days ago | 0

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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...

8 days ago | 1

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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:...

12 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...

13 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)); ...

13 days ago | 0

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Answered
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 ]; ...

14 days ago | 0

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Answered
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...

15 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...

15 days ago | 0

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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...

15 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...

16 days ago | 0

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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...

16 days ago | 0

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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...

16 days ago | 1

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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 ...

21 days ago | 0

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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 ...

21 days ago | 0

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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...

22 days ago | 1

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Answered
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)

22 days ago | 1

Answered
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...

23 days ago | 0

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