I don't know how to plot what answer of dsolve

I want to plot the answer of dsolve. But I can't.

syms x;
f = dsolve('D2y=-(e-k^2)*y','y(0)=1','Dy(1)=0','x');
fplot(f(x));

It isn't work. I tried syms f, f(x) and fplot f,f(x) etc...

How plot?

Answer 1

[madhan ravi]

syms y(x)
Dy = diff(y);
D2y = diff(y,2);
k=3; % example
f = dsolve(D2y==-(exp(-k^2))*y,y(0)==1,Dy(1)==0);
fplot(f);

[seungyong hong]

very very thank you. I don't know 'diff' command and how to use dsolve without string equation ex) 'd2y=(1-k)y'.

sososo thank you!