- "Memoizing" (storing) results of costly calculations for later use (see Loren's blog).
- Creating custom functions with hidden parameters that are set by the calling function (as in this example). This is like a fancy anonymous function.
Two ways of M-subfunction definition: what are discrepances?
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As known, there are 2 ways -- nested subroutines and secondaries subr.
1. nested
function...
...
function...
...
end
...
end
2. primary/secondary
function
...
end
function
...
end
From header (primary function)one can call both nested and secondary subfunctions.
But what kind is better to use? What are differences between ?
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채택된 답변
Andrew Newell
2011년 5월 18일
The primary/secondary functions are much like two functions in separate files, except that the secondary functions (called subfunctions) are only seen by the other functions in the same file. Generally, the variables in functions should be hidden from each other, so this is the default choice. Use nested functions when you need the specific advantages that stem from having access to variables in the workspace of the calling function.
Nested functions are great for:
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Matt Fig
2011년 5월 18일
I would add
3. GUI callbacks. The use of nested functions for GUIs eliminates almost all "How do I share data between callbacks" questions. When I write a complex GUI, it is only with nested functions anymore.
추가 답변 (2개)
Yoav Livneh
2011년 5월 18일
In the first case, the second function is nested and only the outer function can call it. Furthermore the nested function can read and use parameters from the caller function's workspace.
In the second case each function has its own workspace and they don't share parameters.
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Igor
2011년 5월 18일
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Andrew Newell
2011년 5월 18일
Yes, subfunctions are a bit like private methods.
No, the value of a function argument is not copied unless the argument is changed within the function. See http://www.mathworks.com/help/techdoc/matlab_prog/brh72ex-2.html#brh72ex-13.
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