Matlab dsolve function issue with format.

I tried to do

>> eqn = '2*D2x + 2.2*Dx + 0.4*x = 0';
>> sol = dsolve(eqn);
>> pretty(sol)
      /    / sqrt(41)   11 \ \
C1 exp| -t | -------- + -- | | + C2
      \    \    20      20 / /

      /   / sqrt(41)   11 \ \
   exp| t | -------- - -- | |
      \   \    20      20 / /

How can I get the answer as C1exp(-0.280*t) +C2 exp(-0.870t) rather than the format shown above. Thanks.

Answer 1

[Star Strider]

My (R2020a) version requires slightly different symbolic convetions.

Try this:

syms x(t)
Dx = diff(x);
D2x = diff(Dx);
eqn = 2*D2x + 2.2*Dx + 0.4*x == 0;
sol = dsolve(eqn);
sol = vpa(sol,4);
pretty(sol)

producing:

C1 exp(-0.8702 t) + C2 exp(-0.2298 t)

.

[Sushil]

Thanks

[Star Strider]

As always, my pleasure!