C1_W2_Assignment - Programming Assignment: System of Linear Equations Error

Course Q&A Math for Machine Learning Linear Algebra for Machine Learning and Data Sc...
1

I am submitting the program assignment. My program has correct output, but when I test using the unit tes , the following error is displayed.

[[ 1 2 -1 -1 3]
[ 0 1 4 3 22]
[ 0 0 1 3 7]
[ 0 0 0 1 1]]

Expected Output

[[ 1 2 -1 -1 3]
[ 0 1 4 3 22]
[ 0 0 1 3 7]
[ 0 0 0 1 1]]

Test your solution

w2_unittest.test_augmented_to_ref(augmented_to_ref)

Test case “identity_matrix”. Wrong output matrix. Check row reduction operations.
Expected:
[[ 0 1 0 0 1]
[ 0 0 1 1 2]
[ 2 -1 1 -2 0]
[ 0 0 0 -1 0]]
Got:
[[ 1 2 -1 -1 3]
[ 0 1 4 3 22]
[ 0 0 1 3 7]
[ 0 0 0 1 1]]
3 Tests passed
1 Tests failed

How Can I resolve this error to complete the assignment. Kindly advise, if I miss any code or instructions.

Thanks
Regards
Anoop Mathur

2

Hi @Anoop_Mathur,
Thank you for posting!
Could you please check again the arguments when calling the functions ‘AddRows’, ‘SwapRows’ and ‘MultiplyRow’?

3

Hi Degeye,
The parameters are correct, because code is giving me expected solution and unit tests are also passed
Original matrix:
[[ 1. -2. 3. -4.]
[-5. 6. -7. 8.]
[-4. 3. -2. 1.]
[ 8. -7. 6. -5.]]

Original matrix after its third row is multiplied by -2:
[[ 1. -2. 3. -4.]
[-5. 6. -7. 8.]
[ 8. -6. 4. -2.]
[ 8. -7. 6. -5.]]

Original matrix after exchange of the third row with the sum of itself and first row multiplied by 4:
[[ 1. -2. 3. -4.]
[ -5. 6. -7. 8.]
[ 0. -5. 10. -15.]
[ 8. -7. 6. -5.]]

Original matrix after exchange of its first and third rows:
[[-4. 3. -2. 1.]
[-5. 6. -7. 8.]
[ 1. -2. 3. -4.]
[ 8. -7. 6. -5.]]
Expected Output
Original matrix:
[[ 1 -2 3 -4]
[-5 6 -7 8]
[-4 3 -2 1]
[ 8 -7 6 -5]]

Original matrix after its third row is multiplied by -2:
[[ 1 -2 3 -4]
[-5 6 -7 8]
[ 8 -6 4 -2]
[ 8 -7 6 -5]]

Original matrix after exchange of the third row with the sum of itself and first row multiplied by 4:
[[ 1 -2 3 -4]
[ -5 6 -7 8]
[ 0 -5 10 -15]
[ 8 -7 6 -5]]

Original matrix after exchange of its first and third rows:
[[-4 3 -2 1]
[-5 6 -7 8]
[ 1 -2 3 -4]
[ 8 -7 6 -5]]

Test your solution

w2_unittest.test_elementary_operations(MultiplyRow, AddRows, SwapRows)
All tests passed

4

Hi @Anoop_Mathur,
Please, may you check again the code inside your helper functions (MultiplyRow, AddRows, SwapRows)?
Have a nice day!
Regards,
Stephane

5

Hi @Anoop_Mathur, did you find a solution to your issue?
have a nice day!

Kind regards,
Stephane Degeye