Access integration constant

maaaaaaartin
35 ●2 ●7

Hi,

Consider the following code:

x = var('x')

f = function('f')(x)

sol = desolve(diff(f,x), [f,x])

print "sol =", sol

solve(sol, _C)

For which I'm getting NameError: name '_C' is not defined. What would be the right way to set the integration constant after the resolution of the differential equation?

Thanks!

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answered 8 years ago

eric_g
8564 ●10 ●62 ●168 https://luth.obspm.fr/...

Like this (for instance setting the integration constant to 2):

sage: sol2 = sol.subs({SR.var('_C'): 2})
sage: print("sol = {}".format(sol2))
sol = 2

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answered 8 years ago

maaaaaaartin
35 ●2 ●7

For the record, a workaround is to declare var('_C')right before solve(sol, _C).

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Access integration constant savecancel

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