Codes:

- `calc_int.m`: Calc integral $f(x) = (x-tau)^2 * sqrt(2/pi) * exp(-x^2/2)$, range: $[tau, +inf]$.
- `can_recovery.m`: Determine if the signal can be recovered.
- `draw.m`: Draw.
- `get_recovery_prob.m`: Obtain the probability that the signal can be recovered under T experiments.
- `main.m`: Main function entry.
- `phase_transition.m`: