How to increment a variable

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KHADIJA
KHADIJA 2013-12-24
评论： Rev 2025-4-12
Hello. I couldn't find a way to increment a variable in MATLAB using the ++ operator. Can you help me, please? Is there a function or an operator that I can use?
Thanks in advance.

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采纳的回答

John D'Errico
John D'Errico 2016-8-26
编辑：MathWorks Support Team 2019-5-22
To increment a variable X, simply use
X = X+1;
MATLAB does not support the increment operator ++.
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John D'Errico
John D'Errico 2022-9-14
@Jhonler you can try, but since it is not legal MATLAB syntax, it won't work. If all languages used exactly the same syntax and code, then we would only use one language.
Rev
Rev 2025-4-12
The one thing about being able to use syntax like C++ (the increment operation) is that when you want to try out ideas or concepts, Matlab makes it easier to test out sub sections of code instead of trying to compile and run it. It is helpful to be able to implement other language syntax in my experience. Matlab let's us try out code snippets and test out DSP operations with real time interface to hardware and equipment. Not to mention not having deal with the compiler.

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更多回答（2 个）

Wayne King
Wayne King 2013-12-24
编辑：Walter Roberson 2022-1-21
How about just
a = a+1;
a = 1;
x = zeros(10,1);
for k = 1:10;
x(a)= k^2;
a = a+1;
end
Of course, you would never write a loop for the above, or write the loop like that even if you did, but hopefully you get the point.
  2 个评论
Nivethana Narayanan
Nivethana Narayanan 2021-11-28
a = a+1 doesnt work as MATLAB complains that a is Unrecognized function or variable 'a'. is there a way to address this?
Luke Simonson
Luke Simonson 2022-1-21
You need to initialize a as a variable before you set a = a+1.
a = 0;
a = a+1;

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Walter Roberson
Walter Roberson 2013-12-24
You could create a class with preincrement and postincrement methods.
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Francois Deneuville
Francois Deneuville 2019-4-17
By the way, Walter, thanks for you comment:
You could create a class with preincrement and postincrement methods.
it was a great idea
Jesús Ramos
Jesús Ramos 2021-5-29
What you implemented is the ++i operator of C (or java), where the variable is increased before returning the value, if you want to implement the i++ operator, you would have to add another method to the class:
function out = post_add(self)
temp=self.i;
self.i=self.i+1;
out=temp;
end

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