Problems running the code in Mac

Question

Vahagn 2023-3-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1923830-problems-running-the-code-in-mac

评论： Jan 2023-3-7

Hi,

I have a code that works fine with windows, but returns me an error when I try to run it using mac. Here is my code and my error

for i=1:numel(M_.params)
    p.(M_.param_names{i}) = M_.params(i);
end

Brace indexing is not supported for variables of this type.

Here, M_.param_names is 54x8 char and M_.params is 54x1 double.

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Answer 1

Jan 2023-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/1923830-problems-running-the-code-in-mac#answer_1186290

This will not run on a PC also. If M_.param_names is a 54x8 char, you cannot use braces for indexing, because they work for cells only.

So the actual problem is, why M_.param_names is a CHAR matrix on the Mac, while it must be a cell string on the PC to let the code run. How did you create this variable? Is it an import of a text file, which expects specific line breaks?

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Vahagn 2023-3-7

编辑：Vahagn 2023-3-7

Here, how it looks like

Jan 2023-3-7

在 MATLAB Online 中打开

@Vahagn: This looks like a CHAR matrix and as explained already, you cannot access it with curly braces as index. But the conversion to a cell string is easy:

names = cellstr(M_.param_names);  % This is a cell string now
for i=1:numel(M_.params)
    p.(names{i}) = M_.params(i);
end

cellstr crops the trailing spaces.

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Answer 2

Steven Lord 2023-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/1923830-problems-running-the-code-in-mac#answer_1186295

在 MATLAB Online 中打开

Indexing into a char array using {} is not supported on any platform.

a = 'abracadabra'
a = 'abracadabra'
a(5) % 'c'
ans = 'c'
a{5} % error
Brace indexing is not supported for variables of this type.

Perhaps your M_.param_names variable is a char array on Mac but a cell array containing char arrays on Windows and/or Linux. How do you create that field of the M_ struct?