solving an equatin... please help me

Pd = @(u)quadl(@(w)f(u,w), Yb, 1000*Yb)

I want to know the value of u when Pd is 0.8. How do I write the code??

Please help me.... Yb is 6.

[darova]

Did you try fsolve()?

[Hosin Lee]

I can't understand the fsolve.

Can you code it for me please?

Answer 1

[darova]

Also you can try fzero()

f = @(a,x) sin(a*x)./x;
F = @(a) integral(@(x)f(a,x),0,7)-0.8;
% a = fsolve(F,2);            % didn't work
a = fzero(F,2);
F(a)