How to assign objects to array?
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% https://de.mathworks.com/help/rf/ref/sparameters.html
I'm using the RFToolbox and have a bunch of S-Parameters which I import from Touchstone files.
f = "path-to-touchstone-file.s2p";
sobj = sparameters(f);
sobj.Parameters
sobj.Frequencies
sobj.Impedance
Now I want to create an array which holds multiple objects and is accessible by index.
f = ["path-to-file-1",...
"path-to-file-2",...
"path-to-file-3"...
];
for i = 1:numel(f)
sobj(i) = sparameters(f(i));
end
sobj(1).Parameters
sobj(1).Frequencies
sobj(1).Impedance
This does not work. I don't know how to create an array, which can hold the objects returned from sparameters(). I get the following output:
% Unable to perform assignment because value
% of type 'sparameters' is not convertible to
% 'cell'.
%
% Error in example (line 7)
% sobj(i) = sparameters(f(1));
%
% Caused by:
% Error using cell
% Conversion to cell from sparameters is
% not possible.
If I create a single S-Parameter object first I'm able to add more objects afterwards, but I'd like to know how to preallocate the proper data structure.
f = ["path-to-file-1",...
"path-to-file-2",...
"path-to-file-3"...
];
sobj = sparameters(f(1));
for i:numel(f)
sobj(i) = sparameters(f(i));
end
5 件のコメント
Mario Malic
2023 年 4 月 17 日
Yes, for some reason sobj was treated as cell array and you were indexing into it the wrong way. This would have worked.
for i:numel(f)
sobj{i} = sparameters(f(i));
end
You are welcome.
採用された回答
Mario Malic
2023 年 4 月 17 日
It is possible to create an empty array of specified class using https://www.mathworks.com/help/matlab/ref/empty.html
sobj = sparameters.empty(numel(f), 0);
Don't worry about the performance if you did not preallocate array for it. You probably won't notice it even if numel(f) is 1000ish. You can verify yourself with tic and toc.
for i:numel(f)
sobj(i) = sparameters(f(i));
end
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