HP HP-28S - Finding the Cross Product; Finding the Dot Product; Matrices

Finding the Cross Product
Find the cross product of the vector in level 1 with the vector
[2 - 2 1]. (The cross product is defined only for two- and three-
element vectors.)
Key in
the vector.
[I] 2,-2,1
2:
1: [ 16 -11 -18 ]
[2, -2,10
IiJDIiBIIIllDlKaDBIElltI
Calculate the cross product, using CROSS in the third row of the AR-
RAY menu .
• 1 ARRAY II NEXT II NEXT I CROSS
Finding the Dot Product
3:
2:
1 : [ - 47 - 52 - 10 ]
wm!IIDDllDJIl:IBmImmmD
Find the dot product of the vector in level 1 with the vector [5 7 2].
(The two vectors must have the same number of elements.)
Key
in the vector.
[I] 5,7,2
Calculate the dot product.
DOT
Matrices
2:
1 : [ - 47 - 52 - 10 ]
[5,7,20
wm!IIDDllDJIl:IBmImmmD
3:
2:
1: -619
wm!IIDDllDJIl:IBmImmmD
This section describes how to invert a matrix and how to find the
determinant of a matrix. Both of these calculations are restricted to
square matrices-those with the same number of rows as columns.
126 11: Vectors and Matrices