If i have a given Matrix (k x k), how can i expand it to a (n x n) matrix?

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Jeanne Pulvermüller
评论： Rik 2020-12-18
I have to do a QR-decomposition of a Matrix A.
In my Code i have a matrix B (the dimensions are k x k) and i have work with a matrix C (the dimensions are n x n, while n >k)
The matrix C looks just like the identity matrix with the matrix B in the bottom right corner...
Can anyone help me how to write that?
(Sorry, neither my english nor my matlab skills are great :D )

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回答（1 个）

Doddy Kastanya
Doddy Kastanya 2020-12-18
It is not clear how the B and C matrices are related to A. However, if you just want to do QR decomposition, you might want to try "help qr" in MATLAB. It might have the information you need.

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