Re: [Chicken-users] complex numbers

[Thomas Chust]

Daniel B. Faken wrote:
> Hi,
>
>   Does anyone have a package for adding complex numbers to Chicken?
>   (I'm looking for something like 90% compliance with R5RS)

Hello,

well, I just needed something like that myself and as I remembered your 
message, I decided to do it properly. I have attached the compressed 
Scheme source code which can be installed as an egg for chicken.

The extension stores complex numbers as (real . imag) pairs. All 
numerical functions defined in the R5RS standard are redefined. The 
source is pure Scheme, which makes it probably not extraordinarily fast, 
but I can live with it and it should compile on any architecture.

The number->string function produces the notation "123+45i" from a 
complex number. The string->number function uses the regex-case 
extension and understands the following formats for complex numbers: 
"123+45i", "123*e^[-]i2" and "(123 . 45)". Two nonstandard functions 
have been added: true-complex? is a predicate which checks for a number 
from the set C\R and conj returns the complex conjugate of a number.

Please report bugs, if you find some!

cu,
Thomas

complex.scm.bz2
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