Register to reply

Quick Matrix Question

by GuitaristOfRa
Tags: matrix
Share this thread:
GuitaristOfRa
#1
Mar5-11, 05:10 PM
P: 3
Looking over a proof of something, I was confused at this step:

We end up with: R[tex]^{T}[/tex] R = I (the identity matrix)
This must mean that R[tex]^{-1}[/tex] = R[tex]^{T}[/tex]

This is confusing me because I know that A A[tex]^{-1}[/tex] = I , but in the R case the transpose is on the left side instead of the right, and it seems to me that it matters what order the matrices are multiplied.
Phys.Org News Partner Science news on Phys.org
Experts defend operational earthquake forecasting, counter critiques
EU urged to convert TV frequencies to mobile broadband
Sierra Nevada freshwater runoff could drop 26 percent by 2100
homology
#2
Mar6-11, 06:59 AM
homology's Avatar
P: 307
Okay, start with [tex]AA^{-1}=I[/tex]. Can you turn this into [tex]A^{-1}A=I[/tex]?


Register to reply

Related Discussions
Quick matrix question Calculus & Beyond Homework 3
Quick matrix question Calculus & Beyond Homework 8
Quick question about matrix operations. Calculus & Beyond Homework 5
Quick Question: Matrix added to Differential Calculus & Beyond Homework 8
Quick Question: Is this matrix an orthogonal projection? Introductory Physics Homework 2