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To run a function

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Joy Tian
Joy Tian 2015-7-23
评论： Joy Tian 2015-7-24
I have a question in my mind. Why we need to put square bracket containing all output arguments ahead of the function when running a function in the command window? Instead of directly calling the function.
Why only by typing the full command with the output arguments appearing at the beginning can we get the result?
  2 个评论
John D'Errico
John D'Errico 2015-7-24
Because that is how MATLAB syntax is defined? Software does what it is written to do, nothing more. MATLAB is just software.
Joy Tian
Joy Tian 2015-7-24
Well, you are right, John. Well I still like Matlab because it is so good at matrix.

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采纳的回答

Thorsten
Thorsten 2015-7-23
编辑：Thorsten 2015-7-23
You can call a function w/o the square brackets in front, but then you only get the first return value in ans, as David explained. If there is more than one return value, these are NOT assigned to, say, ans2, ans3, ..., probably because Mathworks decided not to clutter your workspace with unwanted data. Keep in mind that there are functions with many return values. So Matlab basically gives you only what you've asked for, with ans as an exception.
  1 个评论
Joy Tian
Joy Tian 2015-7-24
I see. I will remember this.
Thank you Thorsten!

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更多回答（1 个）

David Young
David Young 2015-7-23
If you call the function without a result variable, MATLAB assigns the result to the variable ans. That is
min([3 2 1 5 6])
is the same in effect as
ans = min([3 2 1 5 6])
If you want to assign the result to some other variable, you can name it in front of the equals sign, with or without square brackets round it:
y = min([3 2 1 5 6])
or
[y] = min([3 2 1 5 6])
You only need the square brackets if the function can return more than one result. If you want the second result (and any later ones), you need to use the brackets and name the variables you want to assign the result to, like this:
[y, idx] = min([3 2 1 5 6])
  1 个评论
Joy Tian
Joy Tian 2015-7-24
“You only need the square brackets if the function can return more than one result. If you want the second result (and any later ones), you need to use the brackets and name the variables you want to assign the result to”
That's it!
[y, idx] = min([3 2 1 5 6])
y =
1
idx =
3
Thank you so much, David!

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