Matlab function in Simulink - retain previous non-zero input value -

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i have matlab function block in simulink receives 2 inputs , processes generate output. during course of simulation, @ time points, 1 of inputs zero. i'd use recent non-zero input function whenever particular input value zero. how can achieve this? tried creating persisent variable updates recent non-zero input value doesn't seem work.

edit 1 (to include code):

function y = fcn(u)  persistent ref_val  if isempty(ref_val)    ref_val=10.0 end  if(u(1)<=25)    y=20.0 else    if(u(2)>0)       y=u(2)       ref_val=u(2)     else       y=ref_val    end  end

edit 2: now, fixed issue writing c code uses static variable retain recent non-zero input value. still welcome suggestions/solutions realize directly in matlab function.

can't use in simulation?

//find index of last non-zero value in input

[~,last_non_zero] = max(find(input(1:i) > 0))

//call function using input

output = fnc(input(last_non_zero))


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