how to fill gaps in a matrix with a numbers using interpolation to develop a contour.

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M.S. Khan
M.S. Khan 2019-7-27
评论： M.S. Khan 2019-7-30
M =
0 0 0
0 0 3
0 3 0
3 0 3
0 3 0
0 0 3
3 0 0
0 0 0
in this M matrix, using interpolation i want to fill gaps with 3s between any 3s. for example, in first column, first 3 is in the 4th row and last 3 is in the 7th row. i want to fill rows 5 and 6 also with 3s. same for other columns.
Thanks and regards for all cooperation

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2019-7-27
编辑：Andrei Bobrov 2019-7-27
M(cumsum(M) & cumsum(M,1,'reverse')) = 3;
or for:
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];
s = join(string(M)','');
[a,b] = regexp(s,'30+3');
lo = false(size(M));
for ii = 1:numel(a)
for jj = 1:numel(a{ii})
lo(a{ii}(jj)+1:b{ii}(jj)-1,ii) = true;
end
end
M(lo) = 3;

更多回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2019-7-27
编辑：KALYAN ACHARJYA 2019-7-27
M =[0 0 0
0 0 3
0 3 0
3 0 3
0 3 0
0 0 3
3 0 0
0 0 0]
[rows colm]=size(M);
for i=1:colm
idx=find(M(:,i)==3);
idx_update=idx(1):1:idx(end);
M(idx_update,i)=3;
end
M
Loop can be avoided. Wait for experts comments.
Result:
M =
0 0 0
0 0 3
0 3 3
3 3 3
3 3 3
3 0 3
3 0 0
0 0 0
  5 个评论
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M.S. Khan
M.S. Khan 2019-7-27
编辑：M.S. Khan 2019-7-27
Mr. Kalyan, 3 and next 3 positions should be filled with 3s. For example 3 0 0 0 0 3. So it should be 3 3 3 3 3 3.

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