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In addition to the trig functions, there are other functions that take complex
arguments.
ABS(real or complex)
The absolute function, which is found on the
keyboard above the -X key, returns the
absolute value of a real number.
Eg.
ABS(-3) returns a value of 3.
When you use the absolute function on a complex number a + bi it returns
the magnitude of the complex number
SIGN(real or complex)
This function is part of the Real group but is
very useful with complex numbers and so is
also covered here. If given a vector/complex
number (a,b), SIGN will return another
vector/complex number which is a unit vector
in the direction of (a, b).
i.e. SIGN((A,B)) returns
This is very useful, not just in complex numbers, but also in vector problems.
See also:
(in the Real
SIGN
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2
a
b
a
b
,
+
+
2
2
2
2
a
b
a
b
group),IM,RE,ARG,CONJ
263
.
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