jsonecode doesn't support complex doubles

Question

Alexander DeWitt 2022-2-22

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1655925-jsonecode-doesn-t-support-complex-doubles

评论： Alexander DeWitt 2022-2-22

After a few error messages about encoding objects of class double, I figuered out that my highlevel structs had a field that contianed complex doubles, and therefore couldn't be encoded. So, I was wondering:

Is there a particular reason that complex doubles aren't supported by jsonecode?

If the reason isn't a lack of general consenus on default encoding of complex doubles in JSON, what is the convention?

Thanks,

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Answer 1

Ive J 2022-2-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1655925-jsonecode-doesn-t-support-complex-doubles#answer_902135

在 MATLAB Online 中打开

Here says:

"JSON has no standard way to represent complex numbers, so there is no way to test for them in JSON Schema."

Here also, you'll find more:

www.mathworks.com/help/compiler_sdk/mps_restfuljson/json-representation-of-matlab-data-types.html

You have two (maybe more?) options:

x.a = 1 + 2i;
% 1st
mps.json.encode(x)
ans = '{"a":{"mwcomplex":true,"mwdata":[1,2],"mwsize":[1,1],"mwtype":"double"}}'
% 2nd
y = x;
y.a = string(y.a);
jsonencode(y)
ans = '{"a":"1+2i"}'
% error
jsonencode(x)
Error using jsonencode
Unable to encode objects of class double as JSON-formatted text.