How do you reset a persistent variable?
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The documentaiton says that a persistent variable is reset when the function is cleared from memory. Why then do I not see the persistent variable update in the following?
fun(10)
clear fun
fun(12)
function fun(x)
persistent y
if isempty(y)
y=x;
end
y,
end
5 个评论
dpb
2022-1-14
If you don't want to make fun an externally-visible function, then you'll have to have a flag variable and call the function with it to reset the persistent variable within the local function.
I have a bunch of short functions that set local working directories, etc., for specific workflows that use persistent variables to retain prior working directory and other key pieces on an 'EXIT' function...one of the pieces of those is the ability to reset those on demand. I hadn't thought of using clear for that purpose, though, with them as a shorthand invocation path.
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