Jonathan, thanks for the quick response. This is celestial mechanics, not quantum mechanics, but I will take a look at the package you recommended to see if there is anything I can use. The problem I am looking at is very old, and all solutions created up to now are either approximations or numerical calculations. I am looking to see if I can find an analytical solution for any of the questions involved in the problem, and Sympy is a good way to explore this, even though the questions I am examining are basically pure mathematics and not physics.
On Wednesday, January 6, 2021 at 6:31:48 PM UTC+1 [email protected] wrote: > Thomas, > These look like quantum energy level equations. Have you looked at > sympy.physics.quantum to see if they have solved your problem? I seem to > remember they have defined some special quantities for quantum numbers that > are limited to integer and half-integer values. I make no promises as I > have not actually used the package. This is just a recollection from > scanning through the documents. > > Jonathan > > On Wednesday, January 6, 2021 at 11:16:46 AM UTC-6 [email protected] > wrote: > >> If I use 1/3 in an expression, I get 0.333..., but I know that I can >> write Rational(1,3) instead. Now I have some expressions, such as >> >> -((s)/(j))*((4*(j-1)*s+4*j**2+4*j-2-4*(s-j+1)*m+m**2)/(2*(4*j**2-1)-4*m+m**2)) >> where m is a symbol that will ultimately be replaced by a floating-point >> number, and s and j are integers (positive or negative, but never zero). >> They are replaced (using subs), and when I substitute s by 3 and j by 1, I >> get 0.333.... In the formula, I can't write Rational(s,j), because Rational >> does not accept a symbol as an argument. >> Is there a way to do this? >> > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/4bffc1ad-7dd9-4702-aec9-a1c2d736a6den%40googlegroups.com.
