[Jprogramming] convert 0,1 coding to _1,1

[Roger Hui]

Also {&_1 1 .


On Mon, Dec 10, 2012 at 11:32 PM, Roger Hui <rogerhui.canada at gmail.com>wrote:

> If you really are converting random boolean values to (1,_1) values,
> another possibility is _1&^ or _1^]; i.e. 0 to 1 and 1 to _1.
>
>
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> On Mon, Dec 10, 2012 at 8:58 PM, Brian Schott <schott.brian at gmail.com>wrote:
>
>>    timespacex
>> 6!:2 , 7!:2@]
>>    am =:_1& (I.@:-.@]})
>>    am2=: ((-&1) @ +:)
>>    amd=: <:@:+:
>>    aml=: _1 + +:
>>    d=: 2 6 50000?.@$ 2
>>    timespacex 'am"1 d'
>> 0.011278 1.05535e7
>>    timespacex 'am2 d'
>> 0.187884 8.39091e6
>>    timespacex 'amd d'
>> 0.004365 1.6779e7
>>    timespacex 'aml d'
>> 0.004874 1.67789e7
>>
>> It looks like David's method is fastest and Peter's is most lean.
>> And Linda's method loses nothing relative to David's.
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>