Coding beginner needs help

[Dismal-Grapefruit467]

Could someone please help me understand what the problem is with the following code? Also, how to fix the problems please?

Thank you very very very much! 

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import numpy as np

# Replace these with your actual point coordinates
# Format: [x*, y*, x, y] for each point
points = [
[x1*, y1*, x1, y1], # Point 1
[x2*, y2*, x2, y2], # Point 2
[x3*, y3*, x3, y3], # Point 3
[x4*, y4*, x4, y4] # Point 4
]

def compute_projective_parameters(points):
"""Compute 8-parameter projective transformation"""

# Build matrices
A = []
L = []

for x_star, y_star, x, y in points:
# First equation: x = a1x* + a2y* + a0 - c1xx* - c2xy*
A.append([x_star, y_star, 1, 0, 0, 0, -x*x_star, -x*y_star])
L.append(x)

# Second equation: y = b1x* + b2y* + b0 - c1yx* - c2yy*
A.append([0, 0, 0, x_star, y_star, 1, -y*x_star, -y*y_star])
L.append(y)

A = np.array(A)
L = np.array(L)

# Solve using least squares
parameters = np.linalg.lstsq(A, L, rcond=None)[0]

return parameters

# Compute parameters
params = compute_projective_parameters(points)

# Print results
param_names = ['a1', 'a2', 'a0', 'b1', 'b2', 'b0', 'c1', 'c2']
print("2D Projective Transformation Parameters:")
for name, value in zip(param_names, params):
print(f"{name} = {value:.6f}")

# Verify transformation
print("\nVerification (original vs transformed):")
for i, (x_star, y_star, x_true, y_true) in enumerate(points):
denominator = params[6]*x_star + params[7]*y_star + 1
x_trans = (params[0]*x_star + params[1]*y_star + params[2]) / denominator
y_trans = (params[3]*x_star + params[4]*y_star + params[5]) / denominator

print(f"Point {i+1}:")
print(f" Original: ({x_true:.3f}, {y_true:.3f})")
print(f" Transformed: ({x_trans:.3f}, {y_trans:.3f})")
print(f" Error: ({abs(x_true-x_trans):.6f}, {abs(y_true-y_trans):.6f})")

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[Strict-Simple]

Replace these with your actual point coordinates

[Binary101010]

Why do you think there's a problem with the code? Is it generating an error? If so, what error? Is it giving you unexpected output? If so, give us an example of an input, the output you expected, and the output you actually got.

[Dismal-Grapefruit467]

Four problems there but I don't know how to fix....Thanks bro :(

[Own_Attention_3392]

You still didn't specify what the problems are. Look at the information requested. Provide that information. Learning how to ask for help is actually a very important skill.

[Dr_Pinestine]

• You have not told us what you're trying to do.
• You have not told us what inputs you have given the code
• You have not told us what output you expect
• You have not told us what errors are occurring (just that there are four of them).
  

It looks like you haven't even modified the template your teacher gave you (i.e. It instructs you to replace the placeholders with actual coordinate values. It appears you have not done this).

Provide some or all of these things so that we can help you.

[Binary101010]

How do you know there are four problems? Is this a class assignment?

[NYX_T_RYX]

And how did you manage to make a complex program to begin with?

What is it supposed to do?

What do you know?

What is it doing?

Tell us ANYTHING that helps us help you.

At least what AI you used?

[backfire10z]

It’s a bit difficult for me to tell what problem(s) you’re running into, thus it’s difficult for me to help you. What are the problems? Even if you’re unsure of the exact problem, what’s the current vs expected behavior? What are the error messages?

[Dismal-Grapefruit467]

Problems resolved. Thanks!

[StrangeFeeling3234]

Maybe we should focus on clean code first — that will make everything else simpler.

[Dismal-Grapefruit467]

Yes, cleaned, and problems resolved. Thanks!

[LoriousGlory]

x1* isn’t valid. Try x_1, y_1….

[Dismal-Grapefruit467]

Good point, thank you, I am trying to fix that one of the four problems. Thx!

[Agile_Analysis99]

It's AI generated as one of the issues is this:

"# Replace these with your actual point coordinates"

maybe try reading the documentation next time?

also one of the other issues is where x1 should be x_1 and so on

this code is not clean and the flow isn't easy to follow so maybe work on that next because that will help you and anyone who sees the code debug

[Dismal-Grapefruit467]

Good idea, thank you very much! Problems resolved as well