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请教下vec2ind 和ind2vec函数的作用，最好举例说明下

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就是对 index 的两种表示，一种是用向量化的 0，1 矩阵表示，一种是用线性数值 1,2,3表示。
运行一下下面的例子就明白了：
1. 线性数值表示
vec = [1 0 0 0; 0 0 1 0; 0 1 0 1]   
ind = vec2ind(vec)  
vec =
1 0 0 0
0 0 1 0
0 1 0 1
ind =
1 3 2 3
2. 向量化 0,1 表示
ind = [1 3 2 3]
vec = full(ind2vec(ind))
ind =
1 3 2 3
vec =
1 0 0 0
0 0 1 0
0 1 0 1

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