deleting some of the arrays in a matrix based on a principle
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Hello
I have a matrix of numbers for example: [10; 20; 30; 40; 50; 60; 70; 80; 90;...;160] which are assigned to a mesh in order, the same as the figure below(element size=10). I want to delete the numbers: 40, 80, 120, 160 based on a line which intersects this mesh and only retain [10;20;30;50;60;70;90;100;110;130;140;150] to be my output. How can I code this? Any suggestion is highly appreciated.
Best Regards
Pooneh![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/909715/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/909715/image.jpeg)
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Accepted Answer
Matt J
on 28 Feb 2022
Edited: Matt J
on 28 Feb 2022
A=reshape(10:10:160,4,4)
[M,N]=size(A);
[X,Y]=ndgrid(0:M-1,0:N-1);
test=@(x,y) y+4*x-12<=-1e-6; %test if x,y is below the line with 1e-6 tolerance.
keep=test(X,Y)|test(X+0.5,Y)|... %keep a cell if any of its 4 corners is below the line
test(X,Y+0.5) | test(X+0.5,Y+0.5);
result=A(keep)' %[10;20;30;50;60;70;90;100;110;130;140;150]
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