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Strange behavior of if statement
Welcome to floating point integers. Matlab stores these numbers in a binary representation with a finite precision. Similar to ...

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Create interface to control my instruments.
For general advice and examples for how to create a GUI (and avoid using GUIDE), have look at this thread. You can use a callba...

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How to split .mat data into different variables?
You can't have a file in your workspace, only variables (and objects if you don't count those as variables). There are some gue...

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Can you have a function for multiple scripts that are growing in size?
Scripts are not for real work, use functions instead. Functions allow you to write code that solves a specific problem. You can ...

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Error in saveas, invalid or missing path
You should create a path from parts by using fullfile. That way you avoid having to think yourself about which filesep to use. ...

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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;....

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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...

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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)~...

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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. ...

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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...

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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-...

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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...

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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...

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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,:)); ...

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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 ...

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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 ...

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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) ...

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Displaying an array of zeroes.
doc fprintf

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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 ...

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Saving data to current date
doc datetime

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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...

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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 ...

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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...

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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...

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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...

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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...

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

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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.

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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); ...

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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...

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