variable's scope, persistent variables and timer !!!!

Hello!

I want to access a persistent variable from within timer StopFcn callback function. The callback should delete the timer and empty the persitent variable. my code look like this:

function callerfunc()

persitent resp;
persistent hTimer;

if isempty(resp)
resp=0;
end
if isempty(hTimer)
    timeout=5;
  hTimer =timer('TimerFcn',@(h)fprintf(' %s callerfunc''s Timer is ran out ...'),'StartDelay',timeout); 

hTimer.StopFcn = {@calledfunc, hTimer,resp};
end
start(hTimer);
end

function calledfunc(htimer,hresp)
delete(htimer);
hresp=[];
end

both functions are in the same file. Actually the call of calledfunc is a call by value and not by reference. therefore the persistent variable resp in callerfunc remaain unchanged after StopFcn excecute.can someone help me??

thanks!

Bolivar

Answer 1

[Walter Roberson]

You cannot do that. Nest your second function instead of having it just sequential.

function callerfunc()

persitent resp;
persistent hTimer;

if isempty(resp)
resp=0;
end
if isempty(hTimer)
    timeout=5;
  hTimer =timer('TimerFcn',@(h)fprintf(' %s callerfunc''s Timer is ran out ...'),'StartDelay',timeout); 

hTimer.StopFcn = @calledfunc;
end
start(hTimer);

    function calledfunc(varargin)
      delete(htimer);
      resp=[];
    end

end

[Bolivar]

Thanks