*(guile.info.gz)* Complex Numbers

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21.2.4 Complex Numbers
----------------------
Complex numbers are the set of numbers that describe all possible points
in a two-dimensional space. The two coordinates of a particular point
in this space are known as the "real" and "imaginary" parts of the
complex number that describes that point.
In Guile, complex numbers are written in rectangular form as the sum
of their real and imaginary parts, using the symbol `i' to indicate the
imaginary part.
3+4i
=>
3.0+4.0i
(* 3-8i 2.3+0.3i)
=>
9.3-17.5i
Guile represents a complex number as a pair of numbers both of which
are real, so the real and imaginary parts of a complex number have the
same properties of inexactness and limited precision as single real
numbers.
-- Scheme Procedure: complex? x
-- C Function: scm_number_p (x)
Return `#t' if X is a complex number, `#f' otherwise. Note that
the sets of real, rational and integer values form subsets of the
set of complex numbers, i. e. the predicate will also be fulfilled
if X is a real, rational or integer number.

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