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| Code Block |
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mat1 = [[1, 2, 3], [4, 5, 6]]
# To make the matrices easier to read while coding, we can place the different lists vertical to eachother, rather than horizontally.
mat2 = [[1, 2, 3],
[4, 5, 6]]
# Printing both of these matrices will result in the same output:
[[1, 2, 3], [4, 5, 6]]
# To alter the output to a more readable format, for-loops are very helpful:
[[1, 2, 3],
[4, 5, 6]] |
Now, let's see how to obtain differnt values from our list:
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A = [[1, 2, 3],
[4, 5, 6]]
print("A =", A)
print("A[1] =", A[1]) # 2nd row
print("A[1][2] =", A[1][2]) # 3rd element of 2nd row
print("A[0][-1] =", A[0][-1]) # Last element of 1st Row
column = []; # empty list
for row in A:
column.append(row[2])
print("3rd column =", column)
# This script will result in the following output:
A = [[1, 2, 3], [4, 5, 6]]
A[1] = [4, 5, 6]
A[1][2] = 6
A[0][-1] = 3
3rd column = [3, 6] |
| Code Block |
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| language | py |
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| title | Creating a matrix |
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a = np.array([[1,2],[3,4]]) |
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