Inverse of a diagonal matrix

1. Jan 26, 2006

asdf1

is the inverse of a diagonal matrix always just calculated by taking the inverses of each number in the matrix?

2. Jan 26, 2006

HallsofIvy

Staff Emeritus
What is the inverse of the 2 by 2 matrix all of whose entries are 1?

For some reason, I read "symmetric matrices" where the question was about "diagonal matrices".

Last edited: Jan 27, 2006
3. Jan 26, 2006

matt grime

Take a diagonal matric, mutliply it by the one you just made, what's the answer?

4. Feb 6, 2006

asdf1

thank you very much!!!