is it possible to customize writeStruct for a data type?

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Christopher Goyette
编辑： Madheswaran 2024-9-10
I am using writeStruct to write a structure in XML format. I then need to read it for c++ unit tests.
The problem is, writeStruct writes complex numbers in a way it makes parsing the XML difficult. Is there a way I can customize how writeStruct prints complex numbers?

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回答（2 个）

Madheswaran
Madheswaran 2024-9-6
编辑：Madheswaran 2024-9-10
Hello,
Currently, the 'writestruct' function does not provide built-in customization for formatting complex numbers in XML. However, you can implement a workaround by preprocessing the data before writing it to XML. This involves converting complex numbers into a desired format for C++ unit test cases.
The below function preprocesses a structure by converting all complex values into a sub-structure containing two fields: ‘real’ and ‘imag’.
function modifiedStruct = preProcessComplex(inputStruct)
modifiedStruct = inputStruct;
fields = fieldnames(inputStruct);
for i = 1:numel(fields)
if isnumeric(inputStruct.(fields{i})) && ~isreal(inputStruct.(fields{i}))
modifiedStruct.(fields{i}) = struct('real', real(inputStruct.(fields{i})), ...
'imag', imag(inputStruct.(fields{i})));
elseif isstruct(inputStruct.(fields{i}))
modifiedStruct.(fields{i}) = preProcessComplex(inputStruct.(fields{i}));
end
end
end
You can customize how imaginary numbers are handled to fit your requirements for C++ unit test. The above code uses 'writestruct' function which was introduced in R2020b. For more details, refer to the MathWorks documentation on 'writestruct' : https://mathworks.com/help/matlab/ref/writestruct.html
Hope this helps!
Shlok
Shlok 2024-9-9
Hi,
There’s a small correction. The function 'writeStruct' doesn't exist in R2018a, which is the version mentioned in the question. I believe you meant to refer to 'writestruct’, which was introduced in R2020b.
To write complex numbers using the “writestruct” function, you can implement a workaround. The idea is to iterate through the structure and convert any complex numbers into custom key-value pairs under a substructure. Follow the following steps to achieve the same:
  • Traverse the structure using “fieldnames()” to locate complex numbers.
  • For scalar complex numbers, wrap them in a substructure with real and imaginary keys.
  • For arrays of complex numbers, create a substructure with multiple “complexValue” tags.
  • Recursively process nested structures to handle any complex numbers within them.
  • Use “writestruct” to export the modified structure as XML.
I have created the following function to preprocess complex numbers within the structure before dumping it into XML:
function s = markComplexNumbers(s)
fnames = fieldnames(s);
for i = 1:numel(fnames)
fd = s.(fnames{i});
if isnumeric(fd) && ~isreal(fd)
if isscalar(fd)
% Single complex number, wrap real and imag as attributes to complexValue tag
s.(fnames{i}) = struct('complexValue', struct('real', real(fd), 'imag', imag(fd)));
else
% Array of complex numbers, create multiple complexValue tags with attributes
arrStruct = [];
for j = 1:numel(fd)
arrStruct = [arrStruct; struct('complexValue', struct('real', real(fd(j)), 'imag', imag(fd(j))))];
end
s.(fnames{i}) = arrStruct;
end
elseif isstruct(fd)
% Recursively preprocess nested structures
s.(fnames{i}) = markComplexNumbers(fd);
end
end
end
This code isolates real and imaginary part within the “complexValue” tag, making it an atomic entity. For example, in the following array, complexArray = [1+2i, 3+4i]; above function gives the following output:

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