Short: Desktop calculator for complex numbers Author: thomas.radtke@uni-essen.de Uploader: thomas radtke uni-essen de Type: misc/math or misc/edu Replaces: ci.lha Architecture: m68k-amigaos new in this release (97/06/26): some functions, variables, new constants pi and last 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 pi - pi last - value of last expression (this is a const for technical reasons only, i.e. the user may not change it) ci knows the following functions: re(z) - returns the real part of z im(z) - returns the imaginary part of z exp(z) sqrt(z) sin(z) cos(z) sinh(z) cosh(z) ci understands assignments to variables (e.g. a1_2=1) 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) 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 was 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