Question

define orthogonal matrix ?

Answer 1

Answer:

In linear algebra, an orthogonal matrix is a real square matrix whose columns and rows are orthonormal vectors. One way to express this is Q^{\mathrm {T} }Q=QQ^{\mathrm {T} }=I, where {\displaystyle Q^{\mathrm {T} }} is the transpose of Q and I is the identity matrix.