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[1, 2, 3], [-2, 3, 7]] [1,0,0],[0,1,0],[0,0,1)]] ix_mult(A, B)

[1, 2, 3], [-2, 3, 7]] [1,0,0],[0,1,0],[0,0,1)]] ix_mult(A, B)

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Study the function matrix_mult that takes two 2D arrays and performs a matrix multiplication and returns a new two-dimensional array. Each array should be represented as a list of lists. For example, A = [[1, 2, 3], [-2, 3, 7]] B = [[1,0,0],[0,1,O],[0,0,1]] matrix_mult(A, B) [[1, 2, 3], [-2, 3, 7]] Identify all lines that are in error - that is, select all answers that are correct. def matrix_mult(A, B): A_n = len(A) A_m = len(A[0]) B_n = len(B) B_m = len(B[0]) assert A_m = B_n R_n = A_n 1. 2. 3. 4. 5. 6. 7. 8. R_m = B_m R = [[0 for j in range (R_m)] fori in range(R_n)] def row(M, r): return v[c] for v in M def col(M, c): return M[r] def dot(v1, v2): return sum([x*y for x, y in zip(v1, v2)]) for i in range(R_n): for j in range (R_m): R[i][j] - dot(row(A,i), col(8,j)) return R 9. 10. 11. 12. 13. 14.
Transcribed Image Text:Study the function matrix_mult that takes two 2D arrays and performs a matrix multiplication and returns a new two-dimensional array. Each array should be represented as a list of lists. For example, A = [[1, 2, 3], [-2, 3, 7]] B = [[1,0,0],[0,1,O],[0,0,1]] matrix_mult(A, B) [[1, 2, 3], [-2, 3, 7]] Identify all lines that are in error - that is, select all answers that are correct. def matrix_mult(A, B): A_n = len(A) A_m = len(A[0]) B_n = len(B) B_m = len(B[0]) assert A_m = B_n R_n = A_n 1. 2. 3. 4. 5. 6. 7. 8. R_m = B_m R = [[0 for j in range (R_m)] fori in range(R_n)] def row(M, r): return v[c] for v in M def col(M, c): return M[r] def dot(v1, v2): return sum([x*y for x, y in zip(v1, v2)]) for i in range(R_n): for j in range (R_m): R[i][j] - dot(row(A,i), col(8,j)) return R 9. 10. 11. 12. 13. 14.
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