200
Matrices
A
M1
k-
2
E
To divide by a
square matrix
For division of a matrix or a vector by a square matrix,
the number of rows of the dividend (or the number of
elements, if it is a vector) must equal the number of rows
in the divisor.
This operation is not a mathematical division: it is a left-
multiplication by the inverse of the divisor. M1/M2 is
equivalent to M2
–1
* M1.
To divide the two matrices M1 and M2 that you created
for the previous example, press the following keys:
A
M1
n
A
M2
E
To invert a matrix
You can invert a
square
matrix
in Home by typing the
matrix (or its variable name) and
pressing
S
x
–1
E
. Or you can use the matrix
INVERSE
command (-1) from the Matrix category of the
Math menu.
To negate each
element
You can change the sign of each element in a matrix by
pressing
-
before the matrix name.
Solving systems of linear equations
Solve the following linear system:
2
x
3
y
4
z
+
+
5
x
y
z
–
+
7
4
x
y
–
2
z
+
1
=
=
=
Summary of Contents for 39gII
Page 1: ...HP 39gII graphing calculator user s guide Edition1 Part Number NW249 90001 ...
Page 2: ...Printing History Edition 1 November 201 1 ...
Page 32: ...22 Getting started ...
Page 58: ...48 Apps and their views ...
Page 70: ...60 Function app ...
Page 80: ...70 Solve app ...
Page 136: ...126 Polar app ...
Page 140: ...130 Sequence app ...
Page 148: ...138 Finance app ...
Page 152: ...142 Linear Solver app ...
Page 218: ...208 Matrices ...
Page 226: ...216 Notes and Info ...
Page 238: ...228 Variables and memory management ...
Page 318: ...308 Programming ...
Page 340: ...330 Reference information ...
Page 346: ...vi Product Regulatory Information ...