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Unable to store the persistent variable

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Astrik
Astrik on 31 Aug 2016
Edited: Azzi Abdelmalek on 1 Sep 2016
I am trying to store two persistent variables in order to use them in further iterations. The problem is with the second variable 'weight'. It has a default value 0.1. Once I give a value to my function's 2nd argument, it should take this value.
The code is
function out =exp_average(in,b)
persistent average weight
if isempty(weight) %It does not already exist
weight = 0.1;
end
if isempty(average)
average=in;
elseif nargin<2
average=weight*in+(1-weight)*average;
elseif nargin==2
clear exp_average
average=in;
average=b*in+(1-b)*average;
weight=b;
else
error('WTF')
end
out=average;
end
When I give two arguments to my function, it want my persistent variable 'weight' take the value of the input argument 'b'. With this code it does not keep its value. Any help will be appreciated.

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Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 1 Sep 2016
Edited: Azzi Abdelmalek on 1 Sep 2016
function out =exp_average(in,b)
persistent average weight
if isempty(weight) %It does not already exist
weight = 0.1;
average=in;
end
if nargin==1
average=weight*in+(1-weight)*average;
elseif nargin==2
average=b*in+(1-b)*in;
weight=b;
else
error('WTF')
end
out=average;

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