Comment #3 on issue 3555 by [email protected]: Simplify Stats expressions
http://code.google.com/p/sympy/issues/detail?id=3555
Am I missing something?
In [33]: var('sigma', positive=True)
Out[33]: σ
In [34]: X = Normal('X', mu, sigma)
In [35]: expr = X**2
In [36]: density(expr)
Out[36]:
⎛ ⎛ ___ ___ ⎞ ⎞
⎜ ⎜ -z ╲╱ z ⋅μ -z -╲╱ z ⋅μ⎟ 2 ⎟
⎜ ⎜ ──── ─────── ──── ────────⎟ -μ ⎟
⎜ ⎜ 2 2 2 2 ⎟ ────⎟
⎜ ⎜ 2⋅σ σ 2⋅σ σ ⎟ 2⎟
⎜ ___ ⎜ℯ ⋅ℯ ℯ ⋅ℯ ⎟ 2⋅σ ⎟
⎜ ╲╱ 2 ⋅⎜────────────── + ───────────────⎟⋅ℯ ⎟
⎜ ⎜ │ ___│ │ ___│ ⎟ ⎟
⎜ ⎝ 2⋅│╲╱ z │ 2⋅│╲╱ z │ ⎠ ⎟
Λ⎜z, ──────────────────────────────────────────────⎟
⎜ ___ ⎟
⎝ 2⋅╲╱ π ⋅σ ⎠
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