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algorithmmatlabmatrix
Aggrawal Puja
Aggrawal Puja

Reputation: 47

N x N identity matrix in MATLAB

I am having difficulty creating a generic N x N identity matrix in Matlab.

I am given a system where

Ai,j =

{1, if i does not equal j

{n, if i = j}

You are asked to compute this when the value of the identity matrix n = 10, n = 20.

What I don't see is how to apply matrix indexing here. That is easy enough to do, but how do I account for the given linear system?

Upvotes: 3

Views: 281

Answers (1)

Omri Bahat Treidel
Omri Bahat Treidel

Reputation: 563

There is a builtin function for creating a unit matrix called eye.

have a look at the documentation http://au.mathworks.com/help/matlab/ref/eye.html?requestedDomain=au.mathworks.com

Also, ones(n,m) creates a matrix of ones.

For a square matrix use (n-1)*eye(n) + ones(n) and for non-square (n-1)*eye(n, m) + ones(n, m)

Upvotes: 1

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