Not enough input arguments.

Hi, I am very new to matlab and need some basic help.

function classifier = learnknn(k, d, m, Xtrain, Ytrain)
     classifier = {k, d, m, Xtrain, Ytrain};
end

I get the error " Not enough input arguments. "

But, I cannot change the first line of this code. Only the body of the function can be modified.

Thank you.

[Walter Roberson]

How are you invoking the function?

[danielle sisserman]

I did not invoke it yet.

[KSSV]

Don't press the run button. Go to the folder where function is present....define the input variables and then call the function.

k = yourvalue ;
d = yourvalue ;
m = yourvalue ;
Xtrain = your data ;
Ytrain = your data ;
classifier = learnknn(k, d, m, Xtrain, Ytrain) ;

But what is the use of the function?

[danielle sisserman]

Oh okay, thank you.

I just want the function to return a list containing the function's input arguments. Why? because I'm trying to implement the knn algorithm. The training part just saves the samples.

[Walter Roberson]

function varargin = learnknn(varargin)

is code that implements returning a cell containing the input arguments.

[danielle sisserman]

Thank you Walter.

so if I understand,

function classifier = learnknn(k, d, m, Xtrain, Ytrain)

is actually all I need? no

end

keyword?

and what if I wanted the classifier function to return a diferent datastructure than a cell?

for example, if I wanted to return a list object containing the input objects.

Thankyou.

[Stephen23]

"so if I understand, function classifier = learnknn(k, d, m, Xtrain, Ytrain) is actually all I need?"

No, the syntax that Walter Roberson showed replaces your entire function. It uses the special varargin variable:

https://www.mathworks.com/help/matlab/ref/varargin.html

"and what if I wanted the classifier function to return a diferent datastructure than a cell? for example, if I wanted to return a list object containing the input objects."

MATLAB does not have a "list" type:

https://www.mathworks.com/help/matlab/matlab_prog/fundamental-matlab-classes.html