notation

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Baba
Baba 2011-11-7
what does () mean in the line below?
x=somefunction()

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采纳的回答

Wayne King
Wayne King 2011-11-7
Then somefunction.m does not take input arguments for example:
function x = somefunction
x = 2;
end
if you call
x = somefunction()
you get x = 2
you can also just enter
x = somefunction;

更多回答（2 个）

Wayne King
Wayne King 2011-11-7
The way you've written it, it implies that you are calling a function called somefunction that returns an output x. Inside the parentheses is where you supply any input arguments, name-value pairs, etc.
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Baba
Baba 2011-11-7
but in the code that I have, there are no parameters inside the parenthese.

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Walter Roberson
Walter Roberson 2011-11-7
Then it is a function call with no parameters supplied.
Ordinary MATLAB functions that do not need a parameter, can be called either with the () notation or just by giving the function name. For example,
x = pi + rand;
is equivalent to
x = pi() + rand();
as "pi" and "rand" are both functions in MATLAB.
However, if somefunction were a function handle, then
x = somefunction;
would not call the function: instead it would copy the function handle. But
x = somefunction();
would invoke the function whether it was a regular function or a function handle.

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