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Fix: update the toy example in README.md #74

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Jul 19, 2025
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Fix: update the toy example in README.md #74

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14 changes: 13 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,18 @@ from scipy import sparse

import diffcp

def random_cone_prog(m, n, cone_dict):
"""Returns the problem data of a random cone program."""
cone_list = diffcp.cones.parse_cone_dict(cone_dict)
z = np.random.randn(m)
s_star = diffcp.cones.pi(z, cone_list, dual=False)
y_star = s_star - z
A = sparse.csc_matrix(np.random.randn(m, n))
x_star = np.random.randn(n)
b = A @ x_star + s_star
c = -A.T @ y_star
return A, b, c

cone_dict = {
diffcp.ZERO: 3,
diffcp.POS: 3,
Expand All @@ -127,7 +139,7 @@ cone_dict = {
m = 3 + 3 + 5
n = 5

A, b, c = diffcp.utils.random_cone_prog(m, n, cone_dict)
A, b, c = random_cone_prog(m, n, cone_dict)
x, y, s, D, DT = diffcp.solve_and_derivative(A, b, c, cone_dict)

# evaluate the derivative
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