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314 Functions and commands
Imaginary Part Imaginary part, y, of a complex number, (x+y*i).
IM(x+y*i)
Example:
IM(3+4*i) returns 4
Unit Vector Sign of value. If positive, the result is 1. If negative, –1. If zero,
result is zero. For a complex number, this is the unit vector in
the direction of the number.
SIGN(value)
SIGN((x,y))
Examples:
SIGN(POLYEVAL([1,2,–25,–26,2],–2)) returns –1
SIGN((3,4)) returns (.6+.8i)
Exponential
ALOG Antilogarithm (exponential).
ALOG(value)
EXPM1 Exponential minus 1: .
EXPM1(value)
LNP1 Natural log plus 1: ln(x+1).
LNP1(value)
Trigonometry
The trigonometry functions can also take complex numbers as
arguments. For SIN, COS, TAN, ASIN, ACOS, and ATAN,
see “Keyboard functions” on page 307.
CSC Cosecant: 1/sinx.
CSC(value)
ACSC Arc cosecant.
ACSC(value)
SEC Secant: 1/cosx.
SEC(value)
ASEC Arc secant.
ASEC(value)
e
x
1–