1&| does work, actually.

And, if you want an offset of -1 on that result when the original
value was negative, you can use (1&| - 0&>)

Thanks,

-- 
Raul

On Sun, Aug 6, 2017 at 3:19 AM, Martin Kreuzer <i...@airkreuzer.com> wrote:
> In easy steps (and for further reference) ...
>
> From these test data (two floats, two integers, different signs), to get the
> fractional parts
>
>    v=. 2.25 _8.11 16 _3
>
> simply taking the Residue (when dividing by 1) doesn't work (error at
> negative float position)
>
>    1|v
> 0.25 0.89 0 0
>
> So first get Magnitude
>
>    | v
> 2.25 8.11 16 3
>
> then take Residue
>
>    1 | (| v)
> 0.25 0.11 0 0
>
> then get the sign right (see Raul's remark below)
>
>    (*v) * (1 | | v)
> 0.25 _0.11 0 0
>
> and put it as verb (fp), written as a fork
>
>    fp=. * * 1||
>    fp v
> 0.25 _0.11 0 0
>
> -M
>
>
> At 2017-08-06 02:14, you wrote:
>
>> Eh... but that's wrong.  You can't add any integer to 0.542857 to get
>> _0.542857.
>>
>> If you want signed fractions, you'd need something like (*@] * (| |))
>>
>> Thanks,
>>
>> --
>> Raul
>>
>>
>> On Sat, Aug 5, 2017 at 10:01 PM, 'Pascal Jasmin' via Programming
>> <programm...@jsoftware.com> wrote:
>> > combining other answers we get the cute:
>>
>> > 1 (| |)  _0.542857 _1.1875 1.96552 2.92308 4.13043 5.7 7.82353 10.8571
>> > 15.5455 23.75
>>
>>
>>
>>
>> > ________________________________
>> > From: Bill <bbill....@gmail.com>
>> > To: "programm...@jsoftware.com" <programm...@jsoftware.com>
>> > Sent: Saturday, August 5, 2017 8:30 PM
>> > Subject: Re: [Jprogramming] Fractional parts
>>
>>
>>
>> > this also depends on what do you expect for negative numbers.
>>
>> > Sent from my iPhone
>>
>> > On 6 Aug, 2017, at 7:35 AM, Skip Cave <s...@caveconsulting.com> wrote:
>>
>> >> Oops! i meant:
>> >>
>> >> How does one find the fractional parts of a vector of floating point
>> >> numbers?
>> >>
>> >> 0.542857 1.1875 1.96552 2.92308 4.13043 5.7 7.82353 10.8571 15.5455
>> >> 23.75
>> >> 41.8 114 247
>> >>
>> >> i want:
>> >> 0.542857 0.1875 0.96552 0.92308 0.13043 0.7 0.82353 0.8571 5.5455 0.75
>> >> 0.8
>> >> 0 0
>> >>
>> >> (Last two integers have zero fractional part.)
>> >>
>> >>
>> >> Skip Cave
>> >> Cave Consulting LLC
>> >>
>> >> On Sat, Aug 5, 2017 at 6:30 PM, Skip Cave <s...@caveconsulting.com>
>> >> wrote:
>> >>
>> >>> How does one find the fractional parts of a vector of floating point
>> >>> numbers?
>> >>>
>> >>> 0.542857 1.1875 1.96552 2.92308 4.13043 5.7 7.82353 10.8571 15.5455
>> >>> 23.75
>> >>> 41.8 114 247
>> >>>
>> >>> i want:
>> >>> 0.542857 0.1875 0.96552 0.92308 0.13043 0.7 0.82353 0.8571 5.5455 0.75
>> >>> 0.8
>> >>> 114 247
>> >>>
>> >>> Skip
>> >>>
>> >>> Skip Cave
>> >>> Cave Consulting LLC
>> >> ----------------------------------------------------------------------
>> >> For information about J forums see http://www.jsoftware.com/forums.htm
>>
>> > ----------------------------------------------------------------------
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>> > ----------------------------------------------------------------------
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>> ----------------------------------------------------------------------
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>
>
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