0 个投票

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]
Could someone please help me out?
Thank you,
Santos

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 采纳的回答

David Hill
David Hill 2021-3-18

1 个投票

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

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Thank's for the help David. Do you know some other way of doing it avoiding 'last'? I'll be using this code in Simulink and I know this kind of functions aren't supported. Nevertheless, thank's for your answer!
David Hill
David Hill 2021-3-18
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
Thank's for the quick feed back and help!

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