Aaron,
When I am running dsolve for nonhomogeneous euler equation it is giving
error
NotImplementedError: Could not solve `-x + 2*f(x) - exp(x) -
3*Derivative(f(x), x) + Derivative(f(x), x, x)` using the method of
undetermined coefficients (unable to solve for coefficients File
"sympy/solvers/ode.py", line 561, in dsolve
return _helper_simplify(eq, hint, hints, simplify)
File "sympy/solvers/ode.py", line 583, in _helper_simplify
rv = odesimp(solvefunc(eq, func, order, match), func, order, hint)
File "sympy/solvers/ode.py", line 3300, in
ode_nth_linear_euler_eq_nonhomogeneous
return ode_nth_linear_constant_coeff_undetermined_coefficients(eq,
func, order, match).replace(x,log(x))
File "sympy/solvers/ode.py", line 3862, in
ode_nth_linear_constant_coeff_undetermined_coefficients
return _solve_undetermined_coefficients(eq, func, order, match)
File "sympy/solvers/ode.py", line 3963, in
_solve_undetermined_coefficients
"(unable to solve for coefficients)." % eq)
NotImplementedError: Could not solve `-x + 2*f(x) - exp(x) -
3*Derivative(f(x), x) + Derivative(f(x), x, x)` using the method of
undetermined coefficients (unable to solve for coefficients))
I read the code of undetermined coefficients, this error comes only when
there is no value of "list" of coefficients of Particular solution like a0,
a1, ..
Since the equation it is showing is perfect and it can easily solved by
method of undetermined coefficients. I checked collectterms, r['list'],
r['sol'], these are working fine. The most probably error may be arising
due to trialset.
Since you know the inside-out of this undetermined function, can you
suggest why this is happening?
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