Extracting points within an array

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Patrick Burke
Patrick Burke 2023-4-12
回答： Divyanshu 2023-4-17
I want to find data within an Array, A, that has length less than 120. There are 58 time series saved in A each with different lengths.
for i=1:58
Tg2=SSH_metres(:,A(i));
c=find(~isnan(Tg2));
short(i)=length(c)<120;
end
I have tried this, but this gives an array, short, that is either 1 or 0. Instead, I want the position within A that the value corresponds to. Is there any way of doing this?
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-4-12
编辑：Dyuman Joshi 2023-4-12
Assuming you want the indices for which values of short are 1
out = find(short)
%You can also do this via vectorization
Tg2=SSH_metres(:,A);
c=find(sum(~isnan(Tg2))<120);
If that is not what you want to obtain, please specify more.

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回答（1 个）

Divyanshu
Divyanshu 2023-4-17
As per the description provided, you want to access the indexes of the elements which are not ‘NaN’ from within each of the 58 time series columns of the 2-D array ‘A’. You can have a look at the below demo script and can try understanding it.
A = [1 2 3 4; NaN 2 3 5;NaN NaN 3 6;4 2 4 1];
for i=1:4
col=A(:,i)';
logArray = ~isnan(col);
ind = find(~isnan(col));
length = nnz(logArray);
if length<4
% here you can do the needful operations with 'ind' as it holds the
% list of row numbers for the corresponding column i where the data
% is not 'nan'
end
end

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