Matlab dsolve function issue with format.

2020 7 1
1 个回答
回答已采纳
更新时间：2020 7 2
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0 个投票

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.

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 采纳的回答

Star Strider
Star Strider 2020-7-1

0 个投票

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)
.

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