[Jprogramming] dyad ": rounding error

[Roger Hui]

The difference is that the dyad ": depends on the
C library routines whereas 8!:x do the programming
themselves and take more care.  I'll look into it.
It is likely that a fix will make ": slower.

Thanks for the report.



----- Original Message -----
From: bill lam <bbill.lam at gmail.com>
Date: Sunday, March 18, 2007 11:14 pm
Subject: [Jprogramming] dyad ": rounding error

> On both J504 and J601, dyad ": sometimes does not round properly 
> on some 
> numbers, eg.
>    0j2 ":  0.295
> 0.29
>    0j3 ":  0.2995
> 0.299
> 
> incidentally 8!:x family of J601 does not have this problem,
>    '0.2' (8!:0) 0.295
> +----+
> |0.30|
> +----+
>    '0.2' (8!:1) 0.295
> +----+
> |0.30|
> +----+
>    '0.2' (8!:2) 0.295
> 0.30
>    '0.3' (8!:2) 0.2995
> 0.300