You can inspect the bit pattern of 0.05 inside data vs that of real 0.05
a.i. 2&(3!:5) 0.5
0 0 0 0 0 0 224 63
a.i. 2&(3!:5) {.{.countfreq data
similarly check the bit pattern of the two _0.05
On Thu, Aug 19, 2021 at 7:25 PM Pablo Landherr <pablo.landh...@gmail.com>
wrote:
> Have encountered the following unexpected:
>
> #data
>
> 6226
>
> #~.data
>
> 36
>
> 50{.data
>
> 0.05 0 0 0 0 0 0.05 0 0 0 0 0 0 0 0 0 0.25 0.05 0 0 0 0.1 0.05 0 0 0 0.2
> 0.35 0 0 0 0 0 0.1 0 0 0 0 0 0 0 0.05 0.05 0 0 0 0 0 0 0
>
> countfreq
>
> 3 : '(~.y),.#/.~y '
>
> 10{.countfreq data
>
> 0.05 1161
>
> 0 2886
>
> 0.25 165
>
> 0.1 371
>
> 0.2 145
>
> 0.35 139
>
> _0.05 119
>
> 0.1 100
>
> _0.05 93
>
> 0.15 317
>
> +/0.25=data
>
> 165
>
> NB. Looks fine
>
> *+/0.05=data*
>
> *0*
>
> * NB. What is going on?*
>
> 9!:18 ''
>
> 5.68434e_14
>
> JVERSION
>
> Engine: j807/j64/darwin
>
> Release-d: commercial/2019-03-18T16:07:14
>
> Library: 8.07.26
>
> Qt IDE: 1.7.10/5.9.8
>
> Platform: Darwin 64
>
> Installer: J807 install
>
> InstallPath: /applications/j64-807
>
> Contact: www.jsoftware.com
>
> Two observations:
>
> 0) I expected +/0.05=data to yield 1161
>
> 1) _0.05 occurs twice in the first column (print precision etc are all
> default values)
>
>
> What explains this?
>
>
> Kind regards,
>
> Pablo Landherr
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