MATLAB Answers

Solve symbolic equation with derivatives

4 views (last 30 days)
Steradiant
Steradiant on 4 Jun 2020
Answered: Steradiant on 10 Jun 2020
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?

  0 Comments

Sign in to comment.

Accepted Answer

Steradiant
Steradiant on 10 Jun 2020
isolate(eqn,expr)
is the function I was looking for.

  0 Comments

Sign in to comment.

More Answers (1)

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

  4 Comments

Show 1 older comment
madhan ravi
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
Steradiant
Steradiant on 4 Jun 2020
Yeah, this is the workaround I was thinkin of but I'd have prefered a built in way rather than defining loads of symbolics.

Sign in to comment.

Products


Release

R2020a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!