ind2sub函数使用方法

ind2sub函数可以用来把矩阵元素的index转换成对应的下标（determines the equivalent subscript values corresponding to a single index into an array）

例如： 一个4*5的矩阵A，第2行第2个元素的index的6(matlab中matrix是按列顺序排列)，可以用ind2sub函数来计算这个元素的下标 [I,J] = ind2sub(size(A),6)

[I,J] = ind2sub(siz,IND) returns the matrices I and J containing the equivalent row and column subscripts corresponding to each linear index in the matrixIND for a matrix of size
siz. siz is a vector with ndim(A) elements (in this case, 2), where
siz(1) is the number of rows andsiz(2) is the number of columns.

例子：For matrices, [I,J] = ind2sub(size(A),find(A>5)) returns the same values as[I,J] = find(A>5).