Convert a value into a Matlab syntax string

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Giovanni Camodeca
Giovanni Camodeca 2020-12-6
回答： Steven Lord 2020-12-6
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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采纳的回答

Ameer Hamza
Ameer Hamza 2020-12-6
编辑：Ameer Hamza 2020-12-6
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 ]'

更多回答（2 个）

Rik
Rik 2020-12-6
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.
Steven Lord
Steven Lord 2020-12-6
Ran in:
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.

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