Finding Angle between two points w.r.t x-axis

I am having a matrix of 19 x 2. i need to find the angle between each points with respect to x-axis in the matrix and return the points if the angle is less than 10 degrees.

Answer 1

[Andrei Bobrov]

EDIT

A - your matrix (19 x 2)

out0 = atand(A(:,2)./A(:,1));
out = A(out0 < 10,:);

[aravind dhulipalla]

I need to have the points.This gives the angles right!