Secant of argument in radians
Y = sec(X)
The sec function operates element-wise on arrays. The function's domains and ranges include complex values. All angles are in radians.
Graph the secant over the domains −π/2 < x < π/2 and π/2 < x < 3π/2.
x1 = -pi/2+0.01:0.01:pi/2-0.01; x2 = pi/2+0.01:0.01:(3*pi/2)-0.01; plot(x1,sec(x1),x2,sec(x2)), grid on
The expression sec(pi/2) does not evaluate as infinite but as the reciprocal of the floating-point accuracy eps, because pi is a floating-point approximation to the exact value of π.