zl:1 - FTP

acosh 14
absolute value of number is greater than one, the result is complex, even if
the argument is not complex.
The arc cosine being a mathematically.multiple-valued function, acos
returns a principal value whose range is that strip of the complex plane
containing numbers with real parts between 0 and ft. The range excludes
any number with a real part equal to zero and a negative imaginary part,
as well as any number with a real part equal to ft and a positive imaginary
part.
Examples:
(aces 1) => B.B
(aces B) => 1.57B7964 i ft/2 radians
(aces -1) => 3.1415927 ; ft
(aces 2) => #C(B.B 1.3169578)
(aces -2) => #C(3.1415927 -1.316958)
For a table of related items: See the section "Trigonometric and Related
Functions" in Symbolics Common Lisp: Language Concepts.
acosh number Function
Computes and returns the hyperbolic arc cosine of the argument (that is,
the angle whose cosh is equal to number). The result is in radians.
The argument can be any noncomplex or complex number, except -1. Note
that if the value of number is less than one, the result is complex, even if
the argument is not complex. The hyperbolic arc cosine being mathematically
multiple-valued in the complex domain, acosh returns a principal
value whose range is that half-strip of the complex plane containing numbers
with a non-negative real part and an imaginary part between -ft and ft
(inclusive). A number with real part zero is in the range if its imaginary
part is between zero (inclusive) and ft (inclusive).
Example:
(acesh 1) => B.B i(cesh B) => 1.B
(acesh -2) => #c(1.316958 3.1415927)
For a table of related items: See the section "Hyperbolic Functions" in
Symbolics Common Lisp: Language Concepts.
zl:addl x Function
(addl x) is the same as (+ xl).
The following functions are synonyms of zl:add1:
1+
zl:1+$