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From: Ron AARON <clf@8th-dev.com>
Newsgroups: comp.lang.forth
Subject: Re: Complex square root of -1 : zsqrt(-1)
Date: Sun, 25 Aug 2024 18:38:25 +0300
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Just out of curiosity I tried it in 8th:

ok> -1+0i 0.5 c:^ .
0.000000+1.000000i

and then:
ok> -1+0i 0.5 c:^   dup c:* .
-1.000000+0.000000i


On 25/08/2024 11:34, ahmed wrote:
> Hi,
> With gforth, complex.fs included.
> 
> When calculating the square root of -1, I find that:
> -1e 0e 0.5e 0e z** z. 0.0000000000000000612303176911189+1.i  ok
> -1e 0e zsqrt z. NaN ok
> 
> 
> What's the problem with zsqrt?
> 
> NB.
> -1e 1e-16 zsqrt z. 0.0000000000000000612303176911189+1.i  ok
> -1e 1e-100 zsqrt z. 0.0000000000000000612303176911189+1.i  ok
> 
> 
> Ahmed