34
24
The inverse of a 2
×
2 matrix.
The inverse of the
２×２
matrix
is
. In other words,
As is clear from the formula above, when the denominator
, no inverse exists.
Program
Ｌｂｌ １：？→ Ａ：？→ Ｂ：？→ Ｃ：？→ Ｄ：ＡＤ － ＢＣ → Ｍ：Ｍ ＝０⇒ Ｇｏｔｏ １：
Ａ→Ｘ：Ｄ÷Ｍ→Ａ：Ｘ÷Ｍ→Ｄ：－Ｂ÷Ｍ→Ｂ：－Ｃ÷Ｍ→Ｃ：Ａ
Ｂ
Ｃ
Ｄ ＜
71 STEP
＞
INPUT A, B, C, D : matrix
OUTPUT A, B, C, D : inverse of matrix
Execution Example:
The inverse matrix of
is
For
, the inverse does not exist and the values
and must be re-entered.
a b
c d
1
ad bc
–
------------------
d
b
–
c
–
a
1
ad bc
–
------------------
d
b
–
c
–
a
a b
c d
1
0
0
1
=
a
d
bc
–
0
=
a b
c d
a b
c d
1
4
2 4
1
–
1
0.5
0.25
–
Prog
1
1
EXE
4
EXE
2
EXE
4
EXE
M
Disp
S A
D R
P1
P1 P2 P3 P4
G
EXE
M
Disp
S A
D R
P1
P1 P2 P3 P4
G
EXE
M
Disp
S A
D R
P1
P1 P2 P3 P4
G
EXE
M
S A
D R
P1
P1 P2 P3 P4
G
ad bc
0
=
–
a b c
, ,
d
関数電卓事例集
.book 34
ページ
２００２年９月２日 月曜日 午後６時５１分
Summary of Contents for 3950P
Page 1: ......
Page 46: ...MEMO MEMO MEMO MEMO...
Page 47: ...Authors Dr Yuichi Takeda Research and Development Initiative Chuo University...
Page 48: ......
