how to use varagin with parameter

function definedAndVariableNumInputs(X,Y,varargin)
    disp("Total number of input arguments: " + nargin)
    
    formatSpec = "Size of varargin cell array: %dx%d";
    str = compose(formatSpec,size(varargin));
    disp(str)
if varargin{1}=="f"
    ??
end  
varargin{2}=="b"
  ??
end

acceptVariableNumInputs(3,4,"b")

hi,I want to call the function with additional parameters

If I pass the parameter called "f" I want to pass it the value 3

If I pass the "b" parameter I want to pass the value 5

(it's an example)

Now with varagin I can see the values I pass but not what they refer to... how to do this?

Example I just want to pass it the value of parameter "b" ..

How does the function understand that the only parameter passed refers to "b"?

[Voss]

It's not clear what you are trying to do.

Can you write down a few examples of how this function would be called and how it should interpret the input arguments in each case?

Answer 1

[Matt J]

Perhaps this is what you're looking for:

opts=myfunc(f=3)

opts = struct with fields:
    f: 3
    b: []

opts=myfunc(b=5)

opts = struct with fields:
    f: []
    b: 5

opts=myfunc(f=3,b=5)

opts = struct with fields:
    f: 3
    b: 5

function opts=myfunc(opts)
  arguments
    opts.f=[];
    opts.b=[];
  end

end

Answer 2

[Matt J]

Another possibility:

out=definedAndVariableNumInputs(10,20,f=3)

out = struct with fields:
    X: 10
    Y: 20
    f: 3
    b: []

function out=definedAndVariableNumInputs(X,Y,varargin)

 
 out.X=X;
 out.Y=Y;
 out.f=[];
 out.b=[];
 
 settings=struct(varargin{:});
 
 for f=string(fieldnames(settings));    
     out.(f)=settings.(f);
 end

end