Often we use Module to construct complicate function. Consider that Module create new vars every time we run the function, should I remove the initial values at the end of Module-function?Or should I worry about it?
I never thought of this problem until I browse this question. the first comment under the question suggested 'Try ending the Module with result =plapla; Clear[...]; result'. However,when I test Module on my Mma9, it cleared the value of initial values automatically. That is to say, I have no way to recover the initial values of initial vars after I run the Module(If I didn't Print value out). for example,define:
f[x_] :=
Module[{a, b},
Print@ToString@a;
a = Range[1000]; a[[4]]
]
run f[2] it print the initial symbols a$$4120, however run a$4120 it returns a$4120 as if it had not been set value. So it's not necessary to explicitly Remove the initial symbols of Module at the end of Module?Right?
AttributeTemporarywhich means you don't have to worry. $\endgroup$Module(not your situation) or whenDownValuesare placed on them. $\endgroup$DownValuesby themselves are not a problem, as long as that symbol is not referenced from the outside. So, this is Ok:Module[{f}, f[1] = 1;f[1]], while this leads to a leak forf:Module[{g}, Module[{f}, g[x_] := f[x]; f[1] = 1;];g[1]], even thoughghas been later collected. I mentioned this case here. $\endgroup$