Not enough input arguments.

2020 10 24
0 个回答
更新时间：2020 11 5
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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.

7 个评论
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Walter Roberson
Walter Roberson 2020-10-24
How are you invoking the function?
danielle sisserman
danielle sisserman 2020-10-24
I did not invoke it yet.
KSSV
KSSV 2020-10-24
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
danielle sisserman 2020-10-26
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
Walter Roberson 2020-10-26
function varargin = learnknn(varargin)
is code that implements returning a cell containing the input arguments.
danielle sisserman
danielle sisserman 2020-11-5
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
Stephen23 2020-11-5
"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

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