Short:    Desktop calculator for complex numbers
Author:   thomas.radtke@uni-essen.de
Uploader: thomas.radtke@uni-essen.de
Type:     misc/math or misc/edu

Hi #?,

	This is ci, the desktop calculator for operations
on complex numbers. To install, just copy it to c: or
anywhere else in your command path. Call it with 'ci'
and leave it by pressing 'Ctrl-\' (control backslash, EOF).

	ci accepts inputs in the conventional manner, that
is, real and imaginary part are seperated by addition or
subtraction. The imaginary part is multiplied or divided
by i (square root of -1).

	ci knows the following operators:

	a+b, a-b, a*b, a/b	-	the usual
	a^b			-	exponentiation
	@a			-	mean argument (angle)
	|a|			-	modulus
	~a			-	complex conjugation

	ci knows the following constants:

	i			-	square root of -1
	e			-	Euler number

Every trigonometric operation can be acomplished with the
exponentiation operator, e.g.:

	sin(x) == (e^(z*i)-e^(-z*i))/(2*i)

Of course, any root can be computed too, e.g.:

	n-th root of a == a^(1/n)

	Note that due to the unified way to compute the
exponentiation, the accuracy of the results is not what one
could get. Look at the result of -1^(1/2) in the examples
below. This will change in future versions where functions
and variables will be available :).

	Examples:

$ ci
-1^(1/2)
6.123032e-17+i*1.000000e+00	<- real part should be 0 !
2^2
4.000000e+00+i*0.000000e+00
e^(4*i+2)
-4.829809e+00+i*-5.592056e+00
|1+i|
1.414214e+00+i*0.000000e+00
@(1+i)
7.853982e-01+i*0.000000e+00
(2+3*i)*(i^2)
-2.000000e+00+i*-3.000000e+00

	The parser for ci were generated by 'bison'.

	You may ask for improvements, but please understand that
I didn't have the time to answer all incoming mails immediatley.
Let me know if you are using ci for educational or other purposes
on a regulary (once a week or so) basis.

bye,

Thomas


============================= Archive contents =============================

Original  Packed Ratio    Date     Time    Name
-------- ------- ----- --------- --------  -------------
   19176    9912 48.3% 02-Apr-97 19:21:36  ci
    1851    1014 45.2% 02-Apr-97 20:16:12  ci.readme
-------- ------- ----- --------- --------
   21027   10926 48.0% 04-Apr-97 15:53:32   2 files