separate functions or sub-functions

Dear all,

I have a main function and several sub-functions. Usually, I keep the function and the sub-functions in one .m file. alternatively, I also can save each sub-function as a separate .m file, and then invoke them in the main function.

my question is what the difference between this two way. for example, time consuming, memory needs etc...

thank you. George

Answer 1

[Matt J]

Subfunctions cannot be accessed (without a handle) from outside the mfile. So, if you need (convenient) access to them outside the mfile, it is best not to make it a subfunction.

Subfunctions also do get higher precedence on the search path, but I doubt you would ever see a consequential performance difference because of that.

[George]

thank you Matt.

Actually, I thought there may also have difference on memory consuming. But it seems there is no difference on this point.

[Iain]

If you use NESTED functions, you might notice memory consumption differences.

 function func1

    function func2
     do something
    end
   func2
 end