Created
September 15, 2018 04:43
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spherical <--> cart
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| def sph2cart1(r, th, phi): | |
| x = r * cos(phi) * sin(th) | |
| y = r * sin(phi) * sin(th) | |
| z = r * cos(th) | |
| return x, y, z | |
| def cart2sph1(x, y, z): | |
| r = sqrt(x**2 + y**2 + z**2) + 1e-15 | |
| th = acos(z / r) | |
| phi = atan2(y, x) | |
| return r, th, phi |
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