Y = sec(X)
Y = sech(X)
sec and sech operate element-wise on matrices. Their domains and ranges include complex values. All angles are in radians.
sec(X) is a matrix the same size as X containing the secant of the elements of X.
sech(X) is a matrix the same size as X containing the hyperbolic secant of the elements of X.
sec(pi/2) = 1.6332e+16 is not infinite, but rather a value the size of the reciprocal of the floating point accuracy eps, because pi is only a floating-point approximation to the exact value.
asec,asech
(c) Copyright 1994 by The MathWorks, Inc.