How to use linear interpolation for filling with 3s inside empty spaces in a matrix of os and 3s
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M = [0 0 0;... 0 0 3;... 3 3 0;... 0 3 3;... 3 0 0;... 0 0 3;... 3 0 0;... 0 0 0]; I want to use interpolation to fill the gaps between 3s. I tried different methods but no satisfactory answer Is there any other method possible to apply plz Thanks for all cooperation
2 Comments
dpb
on 26 Jul 2019
Show us what you tried on a real array and what you think wrong with the answer got...
I have no idea what it is you have in mind from this description, sorry...
Answers (3)
Matt J
on 27 Jul 2019
Edited: Matt J
on 27 Jul 2019
One way:
result = sqrt(cummax(M,1).*cummax(M,1,'reverse'))
2 Comments
Matt J
on 27 Jul 2019
My answer addresses your posted question. I suggest you Accept-click one of the answers given to you and then post a new question that covers your more complicated M.
dpb
on 27 Jul 2019
for i=1:size(M,2)
ix=find(M(:,i)==3);
if numel(ix)>1
M(ix(1):ix(end),i)=3;
end
end
2 Comments
dpb
on 27 Jul 2019
Edited: dpb
on 27 Jul 2019
LOL! I knew that was coming while writing the above...illustrates that over-simplification gets the right answer to the wrong question.
How large are your arrays and what are actual values in real application? Such pattern matching may well be better suited to casting the values to char() as then can search for string match as patterns...
Andrei Bobrov
on 27 Jul 2019
Edited: Andrei Bobrov
on 30 Jul 2019
s = size(M);
[a,b] = regexp(join(string(M)',''),'30+3');
jj = repelem(1:s(2),cellfun(@numel,a));
lo = zeros(s);
lo(sub2ind(s,[a{:}]+1,jj)) = 1;
lo(sub2ind(s,[b{:}],jj)) = -1;
M(cumsum(lo)>0) = 3;
Other variant:
M = [0 0 0; 2 2 3; 3 3 0; 0 0 0; 3 3 0; 2 2 3; 0 0 0; 3 3 2; 0 0 0; 3 3 3];
m = M;
m(m == 0) = nan;
M(fillmissing(m,'previous') == 3 & fillmissing(m,'next') == 3) = 3;
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