| Hyperbolic {base} | R Documentation |
These functions give the obvious hyperbolic functions. They respectively compute the hyperbolic cosine, sine, tangent, and their inverses, arc-cosine, arc-sine, arc-tangent (or “area cosine”, etc).
cosh(x) sinh(x) tanh(x) acosh(x) asinh(x) atanh(x)
x |
a numeric or complex vector |
These are generic functions: methods can be defined for them
individually or via the Math group generic.
Branch cuts are consistent with the inverse trigonometric functions
asin() et seq, and agree with those defined in Abramowitz and
Stegun, figure 4.7, page 86.
Abramowitz, M. and Stegun, I. A. (1972)
Handbook of Mathematical Functions. New York: Dover.
Chapter 4. Elementary Transcendental Functions: Logarithmic,
Exponential, Circular and Hyperbolic Functions
The trigonometric functions, cos, sin,
tan, and their inverses
acos, asin, atan.
The logistic distribution function plogis is a shifted
version of tanh() for numeric x.