inverse of sinc function : how to evaluate?

Why does the following does not work in MATLAB?

solve sinc(x)==0.707

[Adam]

What doesn't work about it? Do you have the Symbolic Toolbox which contains that function?

Answer 1

[Azzi Abdelmalek]

Use this

syms x
sol=double(solve(sinc(x)==0.11))

[Ignacio Druet Honrubia]

syms x
x= -vpasolve(sinc(x) == 1/sqrt(2));  

Was useful for me asawell. In this case, x has both positive and negative solutions and i wanted the positive one (therefore the - sign)

I used your solution first and gave me this so thank you !