# Make spceficic array values zero.

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Santos García Rosado on 18 Mar 2021
Hi Mathworks community!
I'm having trouble trying to make some of my array values zero. This array corresponds to my Input:
Input = [-1 0 -1 0 0 NaN NaN NaN NaN -1 0 -1 -1 -1 0 NaN NaN NaN 0 0 -1 0 -1 NaN NaN NaN]
I'd like to make everything inside the array zero, but the last -1 before every NaN series. This should be the expected Output:
Output = [0 0 -1 0 0 0 0 0 0 0 0 0 0 -1 0 0 0 0 0 0 0 0 -1 0 0 0]
Thank you,
Santos

David Hill on 18 Mar 2021
a=find(diff(isnan(Input))==1);
b=find(Input==-1);
Output=zeros(size(Input));
for k=a
Output(b(find(b<=k,1,'last')))=-1;
end
##### 3 CommentsShow 1 older commentHide 1 older comment
David Hill on 18 Mar 2021
You could do something like:
Input = [-1 0 -1 0 0 NaN NaN NaN NaN -1 0 -1 -1 -1 0 NaN NaN NaN 0 0 -1 0 -1 NaN NaN NaN];
Output=zeros(size(Input));
idx=[];
for k=1:length(Input)
if Input(k)==-1
Output(k)=-1;
idx=[idx,k];
end
if isnan(Input(k))
Output(idx(1:end-1))=0;
idx=[];
end
end
Santos García Rosado on 22 Mar 2021
Thank's for the quick feed back and help!

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