What is it called when I specify a vector output of solutions from, say, fsolve?

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Noob
Noob 2020-10-2
评论： Rik 2020-10-2
Hi,
I have a simple question -- just a matter of lingo, I think:
The fsolve algorithm gives all these outputs when it arrives at a solution:
[ x, fval, exit_flag, output, Jacobian ]
If I only write code such as
x = fsolve(f, x_guess)
then I get simply the solution from fsolve.
But if I write
[x, fval] = fsolve(f, x_guess)
then I get both the solution as well as the function evaluation at that solution.
And ditto for exit_flag, output, Jacobian.
What is this process called, when I enlarge the vector output to specify what I want the code to bring back?
Sorry, I know it's a very basic question, but I just want to use the correct lingo.
Thanks,

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Rik
Rik 2020-10-2
Those are called output arguments. Sometimes functions will use the nargout function to determine which calculations should be performed.

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