dsolve function returning empty sum

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Raghuraman S 2019-3-10

评论： Raghuraman S 2019-3-10

Following is the code to solve ode 2nd order ODE d^2y/dt^2+y=0; y(0)=1; y'(0)=0;

I find that the following code works

dsolve('D2y+y=0','y(0)=1','Dy(0)=0')

and it does not work when following code is executed(very equivalent of above code), returns empty sum

syms y(t)
 eqn= diff(y,t,2)+ y ==0;
dsolve(eqn,'y(0)=1','Dy(0)=0')

Any idea, sure I did not understand something.

madhan ravi 2019-3-10

which version of matlab are you using?

Raghuraman S 2019-3-10

Hi 2018b

Walter Roberson 2019-3-10

syms y(t)
dy = diff(y,t);
eqn = diff(y, t, 2) + y == 0;
dsolve(eqn, y(0)==1, dy(0)==0)

Raghuraman S 2019-3-10

Thank you , it works.

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