Matrix Functions And Commands - HP 39G User Manual

Matrix functions and commands

About functions
Matrices
6. Return to HOME and enter the calculation to left
multiply the constants vector by the inverse of the
coefficients matrix.
M2
–1
x
M1
7. Evaluate the calculation.
The result is a vector of the
solutions:
• x = 2
• y = 3
• z = 2 –
An alternative method, is to use the RREF function. See
"RREF" on page 12-12.
• Functions can be used in any aplet or in HOME. They are
listed in the MATH menu under the Matrix category.
They can be used in mathematical
expressions—primarily in HOME—as well as in
programs.
• Functions always produce and display a result. They do
not change any stored variables, such as a matrix
variable.
• Functions have arguments that are enclosed in
parentheses and separated by commas; for example,
CROSS(vector1,vector2). The matrix input can be either
a matrix variable name (such as M1) or the actual matrix
data inside brackets. For example, CROSS(M1,[1,2]).
12-9