How to use linear interpolation to fill gaps to generate a contour (closed surface)

M = 0 0 0
    0 0 3
    0 3 3
    3 3 3
    0 0 0
    0 0 3
    3 0 0
    0 0 0
    
%  in the first colmn, btween 4th & 7th rows, i wan to fill 3. in the last column, between 4th and 6th i want to fill 3.

X = ~all(M==0,2)
N = interp1(find(X),M(X,:), 'nearest')
% its not giving me solution.

i am focusing only first and last column to generate controur (closed surface )

Plz need some tips.

your cooperation is highly appreciated.

warm regards

Answer 1

[madhan ravi]

"i am focusing only first and last column..."

M = [0 0 0;...
     0 0 3;...
     0 3 3;...
     3 3 3;...
     0 0 0;...
     0 0 3;...
     3 0 0;...
     0 0 0];
Constant = 3; % example value
f = find(M(:,1));
fx = f .* [true;false(numel(f)-1,1)];
M(setdiff(nonzeros(fx):max(f),f),1) = Constant;
l = find(M(:,end));
lx = l .* [true;false(numel(l)-1,1)];
M(setdiff(nonzeros(lx):max(l),l),end) = Constant

[M.S. Khan]

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];

Dear Mr. Madhan Ravi, very thankful for your professional support and cooperation. Dr. Ravi, lets suppose in the first column, in 3rd to 5th row, i want to fill 3 but from 5th to 6th, i want to fill 4. how can i handle such problems. plz update me.

Heartiest Regards

[madhan ravi]

I seemed to have answered your original question "% in the first colmn, btween 4th & 7th rows, i wan to fill 3. in the last column, between 4th and 6th i want to fill 3....

i am focusing only first and last column to generate controur (closed surface )" . You would be better off posting a new question.

[M.S. Khan]

Dear Dr. M. Ravi if I have matrix in this shape. 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] How can I fill: 3 0 0 3 —> 3 3 3 3 3 0 3 0 2 —> 3 3 3 0 2 3 0 3 2 0 3 0 3 —> 3 3 3 2 0 3 3 3

Answer 2

[KSSV]

This will be your function:

https://in.mathworks.com/help/matlab/ref/fillmissing.html.

Also read about fillgaps.

[M.S. Khan]

Bro, i dont have NAN values, i have zeros. so how to apply because i already applied but its give me same M matrix

[KSSV]

Replace zeros with NaN's. Simple.