Simple interpolation inside matrix

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Jakub 2013-12-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/109033-simple-interpolation-inside-matrix

评论： Jakub 2013-12-9

采纳的回答： Andrei Bobrov

在 MATLAB Online 中打开

Simple question, I have matrix A=

[1 1 1  1 1]
[1 1 60 1 1]
[1 1 1  1 1]
and i want to interpolate values inside the matrix to get sometgink like
[1  15 30 15  1]
[15 30 60 30 15]
[1  15 30 15  1]

I know that i have to use interp2 but it is just not working for me...

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采纳的回答

Andrei Bobrov 2013-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/109033-simple-interpolation-inside-matrix#answer_117685

编辑：Andrei Bobrov 2013-12-8

在 MATLAB Online 中打开

A =[ 1     1     1     1     1
     1     1    60     1     1
     1     1     1     1     1];
bw = A>1;
B = bwdist(bw,'cityblock');
v = [60./pow2(0:max(B(:))-1),1];
out = v(B+1);

ADD

use scatteredInterpolant:

A = [40 1  1 1 60
1  1 20 1  1
15 1  1 1  1];
[ii,jj] = find(A > 1);
ii = [ii;size(A,1)];
jj = [jj;size(A,2)];
F = scatteredInterpolant(ii,jj,[A(A>1);A(end)]);
[x,y]=ndgrid(1:size(A,1),1:size(A,2));
out = F(x,y);