Convert a value into a Matlab syntax string

Question

Giovanni Camodeca 2020-12-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/682488-convert-a-value-into-a-matlab-syntax-string

回答： Steven Lord 2020-12-6

采纳的回答： Ameer Hamza

Hi all,

is it possible to convert a value from an struct into a string using the Matlab syntax ?

e.g.

I folowing struct : exStruct.value = [1 0 0;0 1 0;0 0 1];

If i am using num2str(exStruct.value) the output is a char that looks like this:

val =

1 0 0

0 1 0

0 0 1

What i want is more sth. like this :

val =

[1 0 0;0 1 0;0 0 1]

Is this possible ?

Cheers

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Answer 1

Ameer Hamza 2020-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/682488-convert-a-value-into-a-matlab-syntax-string#answer_566753

编辑：Ameer Hamza 2020-12-6

在 MATLAB Online 中打开

You can do something like this

exStruct.value = [1 0 0;0 1 0;0 0 1];
out = ['[' strjoin(compose(repmat(' %d ',1,3), exStruct.value), ';') ']']

Result

>> out
out =
    '[ 1  0  0 ; 0  1  0 ; 0  0  1 ]'

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Answer 2

Rik 2020-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/682488-convert-a-value-into-a-matlab-syntax-string#answer_566758

You can do it like that, but it is already Matlab syntax if you add the square brackets, as arrays can be defined across multiple lines.

Anyway: you can split the resulting char into rows (e.g. with mat2cell), add semicolons between each (e.g. with sprintf('%s;', c{:}) removing the trailing semicolon), and add the brackets to either side.

If you have trouble implementing this, post a comment with the code you tried.

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Answer 3

Steven Lord 2020-12-6

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/682488-convert-a-value-into-a-matlab-syntax-string#answer_567018

在 MATLAB Online 中打开

mat2str([1 0 0;0 1 0;0 0 1])
ans = '[1 0 0;0 1 0;0 0 1]'

But if you're doing this so you can later on evaluate this text to define the variable, I would advise against it. The general consensus is to avoid eval wherever possible.