Function requires more input arguments to run

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Cosimo Iurlaro
Cosimo Iurlaro 2017-3-20
评论： Steven Lord 2019-7-5
My function is:
function[fa]=speriamo(u)
if (0<=u<pi/3)
fa=1; end;
if (pi/3<=u<2*pi/3)
fa=1; end;
if (2*pi/3<=u<pi)
fa=-6*u/pi+5; end;
if (pi<=u<4*pi/3)
fa=-1; end;
if (4*pi/3<=u<5*pi/3)
fa=-1; end;
if (5*pi/3<=u<2*pi)
fa=6*u/pi-11; end;
end
when I click "Run", the program give me error: "speriamo" requires more input arguments to run. Any other variable I would add is regarded as an unnecessary variable. It's a simple function, what am I doing wrong?
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Adam
Adam 2017-3-20
Both of the answers below work fine to solve the problem, I am just trying to get you to think logically about it so that you don't do the same thing again.
If the whole point of your function is to run some code based on an input parameter surely the first thing you should be thinking about when running the function is to be able to pass in that input parameter, otherwise what kind of results could you expect?

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采纳的回答

Geoff Hayes
Geoff Hayes 2017-3-20
Cosimo - since this is a function that has one input parameter, then you need to supply that parameter. From the command line you would do
>> [fa]=speriamo(42);
Pressing the RUN button (from the MATLAB file editor) will just call the function as
>> speriamo
and not provide any input parameters. Hence the error.

更多回答（1 个）

Steven Lord
Steven Lord 2017-3-20
When you click Run you call your function with 0 input arguments. The way you have defined the function:
function[fa]=speriamo(u)
it requires one input argument to run. See this page from the documentation for how to configure the Run button to run your function with an input argument, or call your function at the MATLAB command prompt (the >> or EDU>> prompt in the Command Window) with an input argument.
FYI, this line of code:
if (0<=u<pi/3)
doesn't do what you think it does. If you're only going to run this code with a scalar (1-by-1) u then rewrite it as:
if (0 <= u) & (u < pi/3)
If you're going to run this code with a nonscalar u, use logical indexing.

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