Should I indicate no input arguments to a function?

Question

Zoltán Csáti 2017-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/358046-should-i-indicate-no-input-arguments-to-a-function

评论： Walter Roberson 2017-9-23

Suppose I have a function which requires no inputs. Should I indicate it with parentheses () or leave it naked? Both cases work, but is there a convention in the MATLAB community?

Example:

someFunction
  % do sth
end

vs

someFunction()
  % do sth
end

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Stephen23 2017-9-23

编辑：Stephen23 2017-9-23

Use parentheses. It makes the intention clear (that you meant to define a function with no arguments), and allows you to easily check if a line-end has accidentally been altered (who has never deleted/pasted to the wrong location?).

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Answer 1

Walter Roberson 2017-9-23

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If a function requires no inputs, I prefer to use () after calls to it. It is unambiguous, and saved remember whether the name is a function directly or a function handle (function handles require the () to call them)

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Zoltán Csáti 2017-9-23

"prefer to use () after calls to it". At the call site, I also put () to differentiate from a variable. If I understood well you also put for the definition (as in my example above), do you?

Walter Roberson 2017-9-23

If I am creating a function with no arguments then it is most likely because I am answering a question here, tossing together something of no lasting importance. In such cases I usually do not bother to put the () in the function definition. In my own code, I do not typically have functions with no parameters.

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