Then this thread belongs on the chat forum. As documented on http://forums.jsoftware.com:
chat - all other discussions on computer languages and J Thanks, -- Raul On Wed, Dec 20, 2017 at 1:32 PM, Erling Hellenäs <[email protected]> wrote: > Hi all! > > Thanks, I will look into the details tomorrow, but yes , and I see a number > of problems with this as mentioned in this post: > http://www.jsoftware.com/pipermail/programming/2017-December/050179.html > In this thread I am trying to discuss strategies to solve these problems. > Pesch[1986] might give us relevant information about this. Thanks! > > Cheers, > Erling Hellenäs > > > > On 2017-12-20 17:21, Jose Mario Quintana wrote: >>> >>> For this to happen J functions have to be defined for handling arrays of >> >> nothing? >> >> I have not followed this thread, or any other recent thread, closely but >> this might shed some light: >> >> " >> Zero Frame. If the frame contains 0 (as in 3 *"1 i. 0 4), there are no >> argument cells to apply v to, and the shape of a result cell (the value of >> sir) is indeterminate. Pesch [1986] describes a variety of strategies to >> address this problem. In J, the shape is calculated if v is uniform (see >> below); otherwise v is applied to a cell of fills. >> " >> >> Rank and Uniformity Roger K.W. Hui >> >> http://www.jsoftware.com/papers/rank.htm >> >> I hope it helps >> >> >> On Wed, Dec 20, 2017 at 4:03 AM, Erling Hellenäs >> <[email protected]> >> wrote: >> >>> Hi all ! >>> >>> Could we avoid doing these peculiar things in the rank operator if we >>> enabled the handling of arrays of nothing? >>> >>> The verb injected in Rank would then have to give a valid result for an >>> array of nothing? >>> >>> For this to happen J functions have to be defined for handling arrays of >>> nothing? >>> >>> Would it be possible to define an algebra for the handling of arrays of >>> nothing? >>> >>> Could this be the same as enabling missing data? >>> >>> Cheers, >>> >>> Erling >>> >>> >>> >>> Den 2017-12-20 kl. 09:46, skrev Erling Hellenäs: >>> >>>> This is a mathematical concept: https://en.wikipedia.org/wiki/ >>>> Empty_product /Erling >>>> >>>> >>>> Den 2017-12-20 kl. 09:39, skrev Erling Hellenäs: >>>> >>>>> */i.0 >>>>> >>>>> 1 >>>>> >>>>> Here the interpreter automatically adds a 1 to get this peculiar >>>>> result. >>>>> >>>>> /Erling >>>>> >>>>> Den 2017-12-19 kl. 20:01, skrev Raul Miller: >>>>> >>>>>> An empty tank zero array would be inconsistent. >>>>>> >>>>>> The number of elements in an array is the product of its dimensions, >>>>>> and >>>>>> the multiplicative identity is 1, not 0. >>>>>> >>>>>> Thanks, >>>>>> >>>>>> >>>>> ---------------------------------------------------------------------- >>>>> For information about J forums see http://www.jsoftware.com/forums.htm >>>>> >>>> ---------------------------------------------------------------------- >>>> For information about J forums see http://www.jsoftware.com/forums.htm >>>> >>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm >>> >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
