asecd — computes the element-wise inverse secant of the argument, results in degree.
y = asecd(x)
Computes the element-wise inverse secant of the argument,
results in degree. For real input data with absolute value
greater than 1
the results are real and in
[-90 90]
.
asecd(x)
is
equal to asec(x)*180/%pi
.
Kahan, W., "Branch cuts for complex elementary functions, or, Much ado about nothing's sign bit", Proceedings of the joing IMA/SIAM conference on The State of the Art in Numerical Analysis, University of Birmingham, A. Iserles and M.J.D. Powell, eds, Clarendon Press, Oxford, 1987, 165-210. |