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[perm_income.md] Update np.random → Generator API #975

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Merged
jstac merged 1 commit into from
Jul 22, 2026
Merged

[perm_income.md] Update np.random → Generator API #975

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9 changes: 5 additions & 4 deletions lectures/perm_income.md
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Original file line number Diff line number Diff line change
Expand Up @@ -479,8 +479,8 @@ r = 0.05
T = 60

@jit
def time_path(T):
w = np.random.randn(T+1) # w_0, w_1, ..., w_T
def time_path(T, rng):
w = rng.standard_normal(T+1) # w_0, w_1, ..., w_T
w[0] = 0
b = np.zeros(T+1)
for t in range(1, T+1):
Expand All @@ -489,7 +489,8 @@ def time_path(T):
c = μ + (1 - β) * (σ * w - b)
return w, b, c

w, b, c = time_path(T)
rng = np.random.default_rng()
w, b, c = time_path(T, rng)

fig, ax = plt.subplots(figsize=(10, 6))

Expand All @@ -512,7 +513,7 @@ fig, ax = plt.subplots(figsize=(10, 6))

b_sum = np.zeros(T+1)
for i in range(250):
w, b, c = time_path(T) # Generate new time path
w, b, c = time_path(T, rng) # Generate new time path
rcolor = random.choice(('c', 'g', 'b', 'k'))
ax.plot(c, color=rcolor, lw=0.8, alpha=0.7)

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