Function ode_step_euler 

pub fn ode_step_euler(y: &Tensor, dydt: &Tensor, h: f64) -> Tensor

Single step of Euler’s method: y_{n+1} = y_n + h * f(t_n, y_n).

Arguments

• y - Current state vector (1D tensor)
• dydt - Derivative vector at current time (1D tensor, same shape as y)
• h - Step size

Returns

New state vector y_{n+1}