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Sivakorn Bupphadee
numer-60-2
Commits
225d9e24
Commit
225d9e24
authored
Feb 22, 2018
by
“Sivakorn”
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add function
parent
261d1ddb
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README.md
week06/README.md
+21
-0
hw06.py
week06/hw06.py
+11
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week06/README.md
View file @
225d9e24
เขียนฟังก์ชั่นเพื่อหา Upper-triangular matrix (U) จากสมการ Ax =b โดย Ux = c เป็นสมการที่ลดรูปแล้ว
## How To Use
```
from hw06 import Ab2Uc;
import numpy as np
A = np.array([
[4, -2, 1],
[-2, 4, -2],
[1, -2, 4]], float)
b = np.array([11,-16,17], float)
Ab2Uc(A, b)
```
## Result
```
U : [[ 4. -2. 1. ]
[ 0. 3. -1.5]
[ 0. 0. 3. ]]
c : [ 11. -10.5 9. ]
```
\ No newline at end of file
week06/hw06.py
0 → 100644
View file @
225d9e24
def
Ab2Uc
(
A
,
b
):
n
=
len
(
b
)
for
j
in
range
(
0
,
n
-
1
):
for
i
in
range
(
j
+
1
,
n
):
lam
=
A
[
i
,
j
]
/
A
[
j
,
j
]
A
[
i
,
j
:
n
]
=
A
[
i
,
j
:
n
]
-
lam
*
A
[
j
,
j
:
n
]
b
[
i
]
=
b
[
i
]
-
lam
*
b
[
j
]
print
(
'U :'
,
A
)
print
(
'c : '
,
b
)
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