Comment #7 on issue 2074 by [email protected]: dsolve(diff(D(t), t) - k1*(B
+ C2*exp(-k*t) - D(t)),
D(t), 'nth_linear_constant_coeff_variation_of_parameters') gives
AttributeError: 'tuple' object has no attribute 'match'
http://code.google.com/p/sympy/issues/detail?id=2074
var('t C2 k k1 B')
(t, C2, k, k1, B)
D, R = map(Function, 'DR')
dsolve(diff(D(t), t) - k1*(B + C2*exp(-k*t) - D(t)),
D(t), 'nth_linear_cons
tant_coeff_variation_of_parameters')
D(t) == (C3*cos(t*im(k1)) + (C1 - Integral(k1*(-B +
C2*exp(-k*t))*exp(t*re(k1))/
sin(t*Abs(im(k1))), t))*sin(t*Abs(im(k1))))*exp(-t*re(k1))
Is the underlying cmp_to_key problem fixed?
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