Hp 48g Graphing Calculator Manuel d'utilisateur Page 178

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14
To conjugate each element of a complex matrix:
1. Enter the complex matrix onto the stack.
2. Press (MTH 1 (NXT 1 CMPL fNXT) CuNJ to conjugate each
complex element of the matrix.
To extract a matrix of real parts from a complex matrix:
1. Enter the complex matrix onto the stack.
2. Pres.s (MTH") fNXT) CMPL RE to return a matrix containing
just the real parts of each element of the original complex matrix.
To extract a matrix of imaginary parts from a complex matrix:
1. Enter the complex matrix onto the stack.
2. Press ( MTHI (MXT 1 CMPL IM to return a matrix containing
just the imaginary parts of each element of the original complex
matrix.
Matrix Solutions to Systems of Linear
Equations
Systems of linear equations fall into three categories:
Over-determined systems. These systems have more linearly
independent equations than independent variables. There is
no exact solution to over-determined systems, so the “best”
(least-squares) solution is sought.
B Uiider-deterinined systems. These systems have more independent
variables than linearly independent equations. There are either no
solutions or an infinite number of solutions for under-determined
systems. If a solution exists, you want to find the solution with the
minimum Euclidean norm; otherwise, you want to find a minimum
norm least-squares solution.
B Exactly-determined systems. These systems have an equal number
of independent variables and equations. Usually (but not always),
there is a single exact solution for exactly-determined systems. (See
“Ill-Conditioned and Singular Matrices” on page 14-16.)
14-14 Matrices and Linear Algebra
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