Forward optional args to another function
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Hi Matlab Community,
can you help me out with the following problem:
func1(obj, arg1, options)
arguments
obj
arg1 string
options.x string = ""
options.y string = ""
end
func2(arg1, options)
end
func2(obj, arg1, options)
arguments
obj
arg1 string
options.x string = ""
options.y string = ""
end
end
% func1("a", x="b", y="c")
% Throws: Invalid argument at position 2. Function requires exactly 2 positional input(s).
How to pass a struct with optional arguments to another function?
Thanks in advance
2 个评论
Rik
2022-6-3
I never work with the argument block, so I don't have a clear answer for you.
How would you pass a struct as an input anyway with the arguments block?
采纳的回答
Julian Hapke
2022-7-6
编辑:Julian Hapke
2022-7-6
there is
namedargs2cell
in the examples they use it for forwarding of name-value arguments.
0 个评论
更多回答(1 个)
Rik
2022-6-3
编辑:Rik
2022-6-3
This is a terrible cludge. There must be a better way. If you don't find it, feel free to use this. It uses the fact that the x="b" syntax is an extension of the normal NameValue syntax, which you can still use with a comma separated list. Be careful with struct arrays.
This will still work if there are more options in the lower option, but if you want them to be forwarded, they must be defined in the upper function.
func1(1,"a", x="b", y="c", z2="e")
func1(1,"a", x="b", y="c", z1="d")
function func1(obj, arg1, options)
arguments
obj
arg1 string
options.x string = ""
options.y string = ""
options.z2
end
unwound_options=fieldnames(options);
unwound_options(:,2)=struct2cell(options);
unwound_options=reshape(unwound_options.',1,[]);
func2(obj, arg1,unwound_options{:})
end
function func2(obj, arg1, options)
arguments
obj
arg1 string
options.x string = ""
options.y string = ""
options.z1 string = ""
options.z2 string = ""
end
obj, arg1, options
end
2 个评论
Rik
2022-6-7
I personally don't use the arguments block, so I don't know what the proper way would be. I personally just use my own functions to parse optional arguments. That also allows me to keep my code compatible with older releases and with GNU Octave.
If no other answer is posted with a better solution, please consider marking this one as accepted answer. While not perfect, it does work and accepting it may increase visibility for other people with a similar problem.
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