In Python, how do I rotate a matrix 90 degrees counterclockwise?
0
>>> def rotate_matrix( k: List[List[int]]):
"""
For example, if I have:
m = [[1,2,3],
[2,3,3],
[5,4,3]]
rotate_matrix(m) should give me [[3,3,3],[2,3,4],[1,2,5]].
"""
Edit: Preferably without numpy.
python
edited Nov 11 at 21:22
Yvette Colomb♦
20.2k1369108
asked Nov 11 at 16:34
user10634718
141
add a comment |
0
>>> def rotate_matrix( k: List[List[int]]):
"""
For example, if I have:
m = [[1,2,3],
[2,3,3],
[5,4,3]]
rotate_matrix(m) should give me [[3,3,3],[2,3,4],[1,2,5]].
"""
Edit: Preferably without numpy.
python
edited Nov 11 at 21:22
Yvette Colomb♦
20.2k1369108
asked Nov 11 at 16:34
user10634718
141
I answered your question - using python only, as you asked. If you agree that my answer is correct and faithful to the intent of your question, then please accept and/or up vote it. Or, please let me know what else you need, I am happy to try to help you. Thank you
– DrM
Nov 14 at 14:53
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:46
I just copied the code from the answer and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:13
add a comment |
0
0
0
0
>>> def rotate_matrix( k: List[List[int]]):
"""
For example, if I have:
m = [[1,2,3],
[2,3,3],
[5,4,3]]
rotate_matrix(m) should give me [[3,3,3],[2,3,4],[1,2,5]].
"""
Edit: Preferably without numpy.
python
edited Nov 11 at 21:22
Yvette Colomb♦
20.2k1369108
asked Nov 11 at 16:34
user10634718
141
>>> def rotate_matrix( k: List[List[int]]):
"""
For example, if I have:
m = [[1,2,3],
[2,3,3],
[5,4,3]]
rotate_matrix(m) should give me [[3,3,3],[2,3,4],[1,2,5]].
"""
Edit: Preferably without numpy.
python
python
edited Nov 11 at 21:22
Yvette Colomb♦
20.2k1369108
asked Nov 11 at 16:34
user10634718
141
edited Nov 11 at 21:22
Yvette Colomb♦
20.2k1369108
asked Nov 11 at 16:34
user10634718
141
edited Nov 11 at 21:22
Yvette Colomb♦
20.2k1369108
edited Nov 11 at 21:22
Yvette Colomb♦
20.2k1369108
edited Nov 11 at 21:22
Yvette Colomb♦
20.2k1369108
20.2k1369108
asked Nov 11 at 16:34
user10634718
141
asked Nov 11 at 16:34
user10634718
141
asked Nov 11 at 16:34
user10634718
141
141
I answered your question - using python only, as you asked. If you agree that my answer is correct and faithful to the intent of your question, then please accept and/or up vote it. Or, please let me know what else you need, I am happy to try to help you. Thank you
– DrM
Nov 14 at 14:53
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:46
I just copied the code from the answer and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:13
add a comment |
I answered your question - using python only, as you asked. If you agree that my answer is correct and faithful to the intent of your question, then please accept and/or up vote it. Or, please let me know what else you need, I am happy to try to help you. Thank you
– DrM
Nov 14 at 14:53
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:46
I just copied the code from the answer and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:13
I answered your question - using python only, as you asked. If you agree that my answer is correct and faithful to the intent of your question, then please accept and/or up vote it. Or, please let me know what else you need, I am happy to try to help you. Thank you
– DrM
Nov 14 at 14:53
I answered your question - using python only, as you asked. If you agree that my answer is correct and faithful to the intent of your question, then please accept and/or up vote it. Or, please let me know what else you need, I am happy to try to help you. Thank you
– DrM
Nov 14 at 14:53
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:46
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:46
I just copied the code from the answer and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:13
I just copied the code from the answer and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:13
add a comment |
2 Answers
2
active
oldest
votes
2
You could use the numpy function rot90
import numpy as np
m = np.array([[1,2,3],
[2,3,3],
[5,4,3]])
def rotate_matrix(mat):
return np.rot90(mat)
answered Nov 11 at 16:40
Vikhyat Agarwal
418214
add a comment |
1
Here is the counter clockwise matrix rotation as one line in pure python (i.e., without numpy):
new_matrix = [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
If you want to do this in a function, then
def rotate_matrix( m ):
return [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
and either way, the result for
m = [ [1,2,3], [2,3,3], [5,4,3]]
is
[[3, 3, 3], [2, 3, 4], [1, 2, 5]]
Aside, if you want the usual transpose, then the simple one line pure python version is
[[m[j][i] for j in range(len(m))] for i in range(len(m[0]))]
answered Nov 11 at 16:55
DrM
954314
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:45
I just copied the code from here and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:11
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
You could use the numpy function rot90
import numpy as np
m = np.array([[1,2,3],
[2,3,3],
[5,4,3]])
def rotate_matrix(mat):
return np.rot90(mat)
answered Nov 11 at 16:40
Vikhyat Agarwal
418214
add a comment |
2
You could use the numpy function rot90
import numpy as np
m = np.array([[1,2,3],
[2,3,3],
[5,4,3]])
def rotate_matrix(mat):
return np.rot90(mat)
answered Nov 11 at 16:40
Vikhyat Agarwal
418214
add a comment |
2
2
2
You could use the numpy function rot90
import numpy as np
m = np.array([[1,2,3],
[2,3,3],
[5,4,3]])
def rotate_matrix(mat):
return np.rot90(mat)
answered Nov 11 at 16:40
Vikhyat Agarwal
418214
You could use the numpy function rot90
import numpy as np
m = np.array([[1,2,3],
[2,3,3],
[5,4,3]])
def rotate_matrix(mat):
return np.rot90(mat)
answered Nov 11 at 16:40
Vikhyat Agarwal
418214
answered Nov 11 at 16:40
Vikhyat Agarwal
418214
answered Nov 11 at 16:40
Vikhyat Agarwal
418214
answered Nov 11 at 16:40
Vikhyat Agarwal
418214
418214
add a comment |
add a comment |
1
Here is the counter clockwise matrix rotation as one line in pure python (i.e., without numpy):
new_matrix = [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
If you want to do this in a function, then
def rotate_matrix( m ):
return [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
and either way, the result for
m = [ [1,2,3], [2,3,3], [5,4,3]]
is
[[3, 3, 3], [2, 3, 4], [1, 2, 5]]
Aside, if you want the usual transpose, then the simple one line pure python version is
[[m[j][i] for j in range(len(m))] for i in range(len(m[0]))]
answered Nov 11 at 16:55
DrM
954314
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:45
I just copied the code from here and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:11
add a comment |
1
Here is the counter clockwise matrix rotation as one line in pure python (i.e., without numpy):
new_matrix = [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
If you want to do this in a function, then
def rotate_matrix( m ):
return [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
and either way, the result for
m = [ [1,2,3], [2,3,3], [5,4,3]]
is
[[3, 3, 3], [2, 3, 4], [1, 2, 5]]
Aside, if you want the usual transpose, then the simple one line pure python version is
[[m[j][i] for j in range(len(m))] for i in range(len(m[0]))]
answered Nov 11 at 16:55
DrM
954314
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:45
I just copied the code from here and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:11
add a comment |
1
1
1
Here is the counter clockwise matrix rotation as one line in pure python (i.e., without numpy):
new_matrix = [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
If you want to do this in a function, then
def rotate_matrix( m ):
return [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
and either way, the result for
m = [ [1,2,3], [2,3,3], [5,4,3]]
is
[[3, 3, 3], [2, 3, 4], [1, 2, 5]]
Aside, if you want the usual transpose, then the simple one line pure python version is
[[m[j][i] for j in range(len(m))] for i in range(len(m[0]))]
answered Nov 11 at 16:55
DrM
954314
Here is the counter clockwise matrix rotation as one line in pure python (i.e., without numpy):
new_matrix = [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
If you want to do this in a function, then
def rotate_matrix( m ):
return [[m[j][i] for j in range(len(m))] for i in range(len(m[0])-1,-1,-1)]
and either way, the result for
m = [ [1,2,3], [2,3,3], [5,4,3]]
is
[[3, 3, 3], [2, 3, 4], [1, 2, 5]]
Aside, if you want the usual transpose, then the simple one line pure python version is
[[m[j][i] for j in range(len(m))] for i in range(len(m[0]))]
answered Nov 11 at 16:55
DrM
954314
edited Nov 12 at 13:01
answered Nov 11 at 16:55
DrM
954314
answered Nov 11 at 16:55
DrM
954314
answered Nov 11 at 16:55
DrM
954314
954314
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:45
I just copied the code from here and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:11
add a comment |
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:45
I just copied the code from here and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:11
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:45
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:45
I just copied the code from here and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:11
I just copied the code from here and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:11
add a comment |
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I answered your question - using python only, as you asked. If you agree that my answer is correct and faithful to the intent of your question, then please accept and/or up vote it. Or, please let me know what else you need, I am happy to try to help you. Thank you
– DrM
Nov 14 at 14:53
I've tried the code in python IDLE and for some reason, it's outputting the original matrix instead of rotating it. Can you please help?
– user10634718
Nov 15 at 12:46
I just copied the code from the answer and ran it, it is perfect. Please check that you are printing the right array in your code, c.f. print( new_matrix )
– DrM
Nov 15 at 13:13