# 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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**Content Feed**

Averaging scattered data over an n by n grid

Here is a full solution, using histcounts2 and accumarray to do the heavy lifting. This solution plots in 3D, so you can verify...

etwa 2 Stunden ago | 1

| accepted

Greek letters Latex interpreter

You need to turn math mode on: plot(rand(10,2)); ylabel('Shear stress $\tau$ [MPa]', 'fontsize', 11, 'interpreter', 'latex')

etwa 2 Stunden ago | 0

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What are these commands in Matlab? Can any one explain them with examples. I searched them but didn't find any help

The first line is accessing a field iqDAC of the struct metadata, which it transposes. The second line divides two variables. ...

etwa 8 Stunden ago | 0

Fill a matrix with matrix powers

n=3; A=rand(n,n); Zero=zeros(size(A)); C=repmat({Zero},n,n); C(logical(eye(n)))=arrayfun(@(n)A^n,1:n,'uni',false); C=cell2m...

ein Tag ago | 0

How to solve the erro about fzero function?

Your custom function should return a scalar value, but it doesn't: fun = @fun_ball; Trq0 = 10; fun(Trq0)

ein Tag ago | 0

How do I sort automatic variables in matlab?

You shouldn't generate variable names dynamically. You should use an array instead. That way you can use all the normal Matlab t...

2 Tage ago | 1

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Poor display of DICOM images using MATLAB (dicomread)

dicomread does not change the file in any way. Most medical viewers will use a subsampling. The viewer I use, uses an 8x8 biline...

2 Tage ago | 0

need help making a 'for' loop to make a new matrix

Having numbered variables is a problem that should be solved when you create those variables. If you have 40 variables with the ...

3 Tage ago | 1

simple combinations between cells

It can probably be done without a loop, but why do you want that? Loops are very efficient (as long as there isn't a builtin vec...

3 Tage ago | 1

| accepted

How do I find the maximum and minimum of a function in a given domain?

You need a function like fminbnd: y =@(x) (1*x.^4)/4+(4*x.^3)/3- 5*(x.^2)/2; x_min = fminbnd(y,-3,3) Let's confirm this with ...

5 Tage ago | 0

adding two matrices of unequal length

Result=A+B(1+mod(1:size(A,1),end-1),:); (written on mobile, untested code)

5 Tage ago | 1

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extracting the last three characters from cell array

You probably want to extract the extension, instead of hard-coding the last three characters: data={'COD0MGXFIN_20210870000_01D...

6 Tage ago | 1

Calculate mean from a cell array.

Two options of what you could mean: %load your data first websave('data.mat','https://www.mathworks.com/matlabcentral/answers/...

7 Tage ago | 0

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Assign values in the cell

You mean like this? output1={[1 2;3 4],[]}; L=cellfun(@isempty,output1); output1(L)={zeros(8,1)}; output1 Note that cellfun...

7 Tage ago | 0

| accepted

Right way to insert files paths into code

Personally I use a function like the one below to semi-hard-code the paths. The context for this is that I have a synced folder,...

8 Tage ago | 1

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How can add stop button and command in GUI

The general solution is to have the stop button set a flag (either in the guidata or in the UserData property of an object). %i...

8 Tage ago | 0

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string data type is not a class?

help methods This suggests that you can't use the methods(object) syntax for char and string inputs. methods('1') methods(cla...

9 Tage ago | 0

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cell cal from function problem

If you pre-allocate the cell array you can use a comma separated list: [input1, input2, input3, input4]=deal(rand); AA=cell(...

9 Tage ago | 0

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Getting around overuse of "if" statements.

You should use the value of DAY to set the value of a variable you can use as the range. You should also use strcmp to compare c...

10 Tage ago | 1

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How to calculate a median value of each interval?

%generate some random data temperature=15+10*rand(8767,1); phase=360*rand(size(temperature)); temperature_rounded=round(tem...

11 Tage ago | 0

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Have you figured out an easy way to publish your MATLAB projects for public consumption?

(this is not a drop-in solution) You could bundle your m-file with a copy of GNU Octave. The main upside is that it will be fr...

15 Tage ago | 1

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How to plot the convolution of 2 functions

You didn't do the convolution on a function. However, since the vectors you did use are the y values of functions (with a shared...

16 Tage ago | 0

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I want to load a folder in appdesigner by using "button" and to load the path of the folder in the "EditField". How?

The uigetdir function only has 1 output. folder = uigetdir(); if isequal(folder,0) ...

16 Tage ago | 0

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extracting all lines includes specific string from text file

You can get my readfile function from the FEX. %If you don't use the readfile function, you can use readlines instead readfile...

17 Tage ago | 1

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Subtracting Current and Previous Value of the same variable

No,that is not possible. What you can do is create a new variable which contains the previous value of a. Then you can trivially...

17 Tage ago | 0

Pause execution of While loop and resume from the same point with PushButtons App Designer

The reason for your issue is that you're using toc, which will still continue running. If you measure how long your GUI has bee...

17 Tage ago | 0

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I want to compare two arrays and check that which value is missing in second array as compared to first one?

You should avoid variable names like sum, as that will prevent you from using the sum function. Your question sounds like you n...

19 Tage ago | 0

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Modifying a Variable if a condition is met

Array operation in Matlab tend to be much faster than other solutions. This is a situation where you can use logical indexing: ...

22 Tage ago | 0

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Build a relation between matrix components

It is almost possible to use a convolution to solve your question, but I couldn't see how, so I did it with a replicated array. ...

22 Tage ago | 1

| accepted