MATLAB高手，请问谁能帮忙解释以下程序的含义，谢谢！

% EDGE4CONNECTED Creates edges where each node
%   is connected to its four adjacent neighbors on a 
%   height x width grid.
%   E - a vector in which each row i represents an edge  E(i,1) --> E(i,2).
%  The edges are listed is in the following neighbor  order:
% down,up,right,left, where nodes  indices are taken column-major.
function E = edges4connected(height,width)
N = height*width;
I = []; J = [];
% connect vertically (down, then up)
is = [1:N]'; is([height:height:N])=[];
js = is+1;
I = [I;is;js];
J = [J;js;is];
% connect horizontally (right, then left)
is = [1:N-height]';
js = is+height;
I = [I;is;js];
J = [J;js;is];
E = [I,J];
end





PS：is = [1:N]';  is([height:height:N])=[];
        I = [I;is;js];都是什么意思啊？
	           

答案：你运行一下相信你就知道他是什么意思了
N=13;
height=2;
is=[1:N]'
is([height:height:N])=[]%删除is矩阵中部分元素
js=is+1
I=[]
I=[I;is;js]

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