# Solve symbolic equation with derivatives

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I want to solve an equation with the symbolic math toolbox. This equation also contains derivatives. E.g.:
eqn1 = 0 == x + y + diff(f(t),t)
sol1 = solve(eqn1, diff(f(t),t));
But I always get an empty structure as solution. Is there any way to do this or do I have to convert the diff(f(t),t) into another symbolic variable and convert it back to the derivative after I solved the equation?

isolate(eqn,expr)
is the function I was looking for.

madhan ravi on 4 Jun 2020
dsolve(...) is the one to be used for odes.

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madhan ravi on 4 Jun 2020
syms x y df
% df -> diff(f(t),t)
eqn1 = 0 == x + y + df
sol1 = solve(eqn1, df)
doc subs
Yeah, this is the workaround I was thinkin of but I'd have prefered a built in way rather than defining loads of symbolics.
madhan ravi on 4 Jun 2020
Good luck.

R2020a

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