call function with multiparameter:what is the best solution?

%WHAT IS best solution ?

%Solution A:

a)CaricoSistemi2Last_Struct(Settings,[])
b)CaricoSistemi2Last_Struct(Settings,mat)


function D_=CaricoSistemi2Last_Struct(Settings,mat)

if isempty(mat)
   D1=load(Settings.tslist,'-mat');
   D_=D1.StratList;
else
   D_=mat;  
end
....
....    
end


%Solution B:

a)CaricoSistemi2Last_Struct(Settings)
b)CaricoSistemi2Last_Struct(Settings,mat)


function D_=CaricoSistemi2Last_Struct(Settings,mat)

if nargin<2
   D1=load(Settings.tslist,'-mat');
   D_=D1.StratList;
else
   D_=mat;  
end
....
....    
end

[Les Beckham]

I would say that this is mostly a matter of personal preference.

Solution B is probably more commonly used. Solution A is often used if you have additional arguments after your "optional" second argument.

Answer 1

[Chunru]

You could also use arguments block. doc arguments for more details.

a)CaricoSistemi2Last_Struct(Settings)

b)CaricoSistemi2Last_Struct(Settings,mat)

function D_=CaricoSistemi2Last_Struct(Settings,mat)
arguments
    Settings
    mat = [];       % default
end

if isempty(mat)
    D1=load(Settings.tslist,'-mat');
    D_=D1.StratList;
end

% More codes

[shamal]

if i want to call using second parameter CaricoSistemi2Last_Struct(mat)

like the reserved word "arguments" it understands that the name passed feeds the second parameter and not the first?

[Chunru]

Matlab function arguments are positional, meaning that the positions are important.

For example, you can not call using second parameter CaricoSistemi2Last_Struct(mat) in the following code

function D_=CaricoSistemi2Last_Struct(Settings,mat)
arguments
    Settings
    mat = [];       % default
end

If you do want to use the name-value-pair way of passing argument, you can do the following

function D_=CaricoSistemi2Last_Struct(options)
arguments
    options.Settings = []   % your default
    options.mat = [];       % default
end

Then you can call the function CaricoSistemi2Last_Struct(mat=matval)

Again, doc arguments for more details.

[shamal]

ok thanks