MATLAB: How to generalize the size of identity matrix as that of any size of input matrix

identitymatrix

My input matrix M of size 5X5, I want an identity matrix of its size so I gave I=ones(5).I have to change every time the size of identity matrix to that of the size of input matrix.

I want generalized way of identity matrix any help regarding this query please.

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eye(length(M))

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MATLAB: Any size of matrix

Kinda confusing what you're asking.

If your input matrix is M, just write

ones(size(M))

for a matrix of ones the same size as your input matrix.

If you don't have an input matrix to get the size, and want a matrix of ones that is 3 x 6, write

ones(3,6)

If I didn't answer your question, it's because it wasn't very clear. You should read this: http://www.mathworks.com/help/matlab/ref/ones.html

MATLAB: Inverse and identity matrix

It happens because of the basic rules of those matrix operators.

All of your matrices are 3x3. Both of those binary operations (* and /) between 3x3 matrices result in another 3x3 matrix.

My guess is you have invented in your mind a new rule for the / operator, wherein it becomes a matrix concatenation operator, or something like that. Sorry, but operators have explicit definitions in MATLAB. They follow their defined behaviors, as I would hope they should.

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MATLAB: Any size of matrix

MATLAB: Inverse and identity matrix

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