zl:1 - FTP

log
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(locf (array-leader faa 3» ==> (ap-leader faa 3)
(locf a) ==> (variable-location 'a)
(locf (plist 'a» ==> (property-cell-location 'a)
(locf (aref q 2» ==> (aloc q 2)
If access-form invokes a macro or a substitutable function, locf expands the
access-form· and starts over again. This lets you use .locf together with
defstruct accessors.
If access-form is (cdr list), locf returns the list itself instead of a locative.
See the section "Generalized Variables" in Symbolics Common Lisp: Language
Concepts.
log number &optional base Function
Computes and returns the logarithm of number in the base base, which
defaults to e, the base of the natural logarithms. Note that the result can
be a complex number even when the argument is noncomplex. This occurs
if the argument is negative.
The range of the one-argument log function is that strip of the complex
plane containing numbers with imaginary parts between -1t (exclusive) and
1t (inclusive).
The range of the two-argument log function is the entire complex plane.
I t is an error if number or base is zero. Both arguments can be numbers
of any type.
The result is always in complex or noncomplex floating-point format.
Numeric type coercion is applied to the arguments where proper.
Examples:
(log 2) => B.6931472
(log 16 2) => 4.B
(log -1.B) => #C(B.B 3.1415927)
(log -1 #C(B 1» => #C(2.B B.B)
For a table of related items: See the section "Powers Of e and Log
Functions" in Symbolics Common Lisp: Language Concepts.
zl:log n Function
Returns the natural logarithm of n. n must be positive, and can be of any
numeric data type.
Example: