# how to make nan turn into 0 in array

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Naufal Arfani on 17 Jan 2021
Edited: dpb on 22 Jan 2021
Hello all,
im working in simulink with findpeaks and I have the code as below, for the condition if u ~ = 0 it works well, so the else condition is in the condition if u == 0,
but then there is a nan value outside u ~ = 0 so you need to add elseif,
but when I tried with isnan (u) it couldn't detect that he was nan and I wanted to change it to all 0 values
so that there is an error as shown below,
can anyone help me find out where it went wrong thank you very much
function [dist,peak2,locs2] = fcn(u)
locs = zeros(size(u));
pks = zeros(size(u));
if u ~= 0
[pks,locs] = findpeaks(u);
elseif isnan(u)
locs(size(u))= 0;
pks(size(u)) = 0;
else
locs(size(u))= 0;
pks(size(u)) = 0;
end
a = locs(2)- locs(1);
b = pks(1);
c = locs(1);
dist = a;
peak2 = b;
locs2 = c; @Naufal Arfani I changed the alfa step input to have an initial value of 1 and final value of 5, and u does indeed have several peaks, but like dpb said, what to do with that information is not something I'd be able to tell you, because I don't know the physics of the system that you are simulating. That is not a programming problem and you'll probably have to figure that out on your own.
As to the other model that you attached for the NaN issue, it's in R2019b again. 😌

R2019b

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