Finding a zero location in a vector

Hi, I have to find the zero-lift angle of attack for a given airfoil. This means that I have a vector of alpha values and a vector of lift coefficient values. I need to find at what alpha value the lift coefficient is 0. Here are the two vectors:

    alpha=[-5:10]
    Cl=[-0.3725  -0.2525  -0.1324  -0.0123  0.1078  0.2279  0.3479  0.4679  0.5876  0.7073  0.8267  0.9458  1.0647  1.1832  1.3014  1.4191]

How do I find the value of alpha where Cl is equal to 0? I'm assuming there is some kind of interpolation I could do but I have never interpolated in MATLAB before, the interp1 document page confused the heck out of me, and any help would be appreciated.

Answer 1

[the cyclist]

interp1(Cl,alpha,0)