How do you reset a persistent variable?
38 views (last 30 days)
Show older comments
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 Comments
dpb
on 14 Jan 2022
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.
Accepted Answer
More Answers (0)
See Also
Categories
Find more on Environment and Settings in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!