将单位矩阵插入到较大的空矩阵维中(Insert an identity matrix into a larger dimension of null matrix)

将单位矩阵插入到较大的空矩阵维中(Insert an identity matrix into a larger dimension of null matrix)

假设我有一个单位矩阵。

I=eye(3)

这将产生

I = [1 0 0 0 1 0 0 0 1]

现在我想将I插入到（5X5）空矩阵中，这样我的结果就是

N = [0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1]

我怎么能有效地实现这一目标。谢谢你

Suppose i have an identity matrix .

I=eye(3)

which will produce

I = [1 0 0 0 1 0 0 0 1]

Now i want to insert I into a (5X5) null matrix such that my result will be

N = [0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1]

How could i achieve this efficiently .Thanks in advace

最满意答案

或者，

m = 5; n = 3; a = diag( [zeros(1, m-n), ones(1,n)] );

Alternatively,

m = 5; n = 3; a = diag( [zeros(1, m-n), ones(1,n)] );