Use of this symbol [~]

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chaos4u2
chaos4u2 2013-2-24
评论： Daniel 2021-4-23
Hello, I have curiosity for the use of this symbol in brackets: [~].
For example, I've seen it, calling a function: [~]=function(S).
Where get stored this symbol, what it contents, and why is it used?
Thanks a lot!

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Azzi Abdelmalek
Azzi Abdelmalek 2013-2-24
编辑：Azzi Abdelmalek 2013-2-24
Example
x=[2 1 3 0 5]
[val,idx]=sort(x)
The result
val =
0 1 2 3 5
idx =
4 2 1 3 5
If we want to get just idx
[~,idx]= sort(x)
the result is
idx =
4 2 1 3 5
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Walter Roberson
Walter Roberson 2019-5-9
There is no equivalent in Python. Python cannot return to multiple variables.
You need to design each Python function to return an Object (equivalent to MATLAB struct), or a tuple (which is immutable), or a list.
Whatever you decide, you could put None into the first output location. However, there still needs to be something there to receive the entire set of outputs and pull out the remaining wanted values.
Daniel
Daniel 2021-4-23
Thank you very much!I got it!

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