llm-srbench/phys_osc/PO13/formula.py

# ===== GROUND TRUTH REFERENCE =====
# NOTE: This ground truth serves as a reference answer for symbolic regression tasks
# This expression is NOT the original function used to generate the training data
# It is provided solely for evaluation and comparison of large model outputs
# DO NOT use this expression as the basis for data generation

def dv_dt(x, t, v):
    F0 = 1.0
    mu = 1.0
    omega0 = 1.0
    gamma = 1.0
    return F0 * np.sin(t) - mu * (1 - x**2) * v - omega0**2 * (gamma * np.abs(v)**(1/3) + 1) * x