matlab - speed up replace NaNs with last non-Nan value -

I would like to change all Naano vector with last week's non-Anaan value

  Input = [1 2 3 NaN NaN 2]; Output = [1 2 3 3 3 2];   
 I will try and speed up the loop I already have  
  input = [1 2 3 NaN NaN 2]; If Adnan (Input (1)) Input (1) = 0; I = 2 for inputting (input) if uran (input (i)) input (i) = input (i-1);   
 Thanks in advance   
 
 
 Since you want the past Non-nan values, I think the first value should be a number  
  while (any (input) input (adapter) = input (find (isnan (input)) - 1); finally   
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