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hi could you please tell me what's wrong with this code?
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I get this error " Warning: Explicit solution could not be found.
>> syms x(t) y(t)
z=dsolve(diff(y)==x-x.^3,diff(x)==y)
2 commentaires
Alberto
le 10 Avr 2014
It happends the same with a more simplest version:
syms x(t)
z=dsolve(diff(diff(x))==x.^3 )
Walter Roberson
le 10 Avr 2014
That's a messy pair. The solution appears to be
y(t) = diff(x(t),t)
x(t) = C2 * sqrt(2) * sqrt(1/(C2^2+1)) * JacobiSN(((1/2*i) * sqrt(2) * t + C1) * sqrt(2) * sqrt(1/(C2^2+1)), C2)
where C1 and C2 are constants of proportionality
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