f=:4 :'y 0}x' a=:1e6?@#0 timespacex'a=:a f 0' 0.004784 8.39053e6 timespacex'a=:a 0}~0' 8e_6 1920
> On Apr 25, 2017, at 10:35 PM, Raul Miller <[email protected]> wrote: > > What do you mean by "extra copies" and how have you been measuring that? > > (Most of the time, a "copy" just means incrementing a reference count. > There have been some exceptions, though, for boxed data, for example.) > > Thanks, > > -- > Raul > > > On Tue, Apr 25, 2017 at 9:19 PM, Xiao-Yong Jin <[email protected]> wrote: >> >>> On Apr 25, 2017, at 6:30 PM, Eric Iverson <[email protected]> wrote: >>> >>> I have not followed this discussion at all and am probably way off base. >>> >>> But how is: >>> >>> allocate a few structures, and pass their pointers to the same function in >>> separate callings >>> >>> different from: >>> >>> allocated a few globals in an agreed upon locale (call it the heap), and >>> pass their names (pointers) to the same verb in separate callings >>> >>> ? >> >> This question is actually right on spot, and I am struggling with this. >> There are two aspects of this problem in my opinion. >> >> 1. Unnecessary copying of data, given the current state of the in-place >> operations in J. To have a varied state in J, passing names to verb >> essentially amounts to the following operations, >> >> State =. State Verb Control NB. akin to usual functional style >> >> Most of the time J would make unnecessary copies of the data in State. >> I haven't found a reliable way to avoid extra copying, except for when >> the 'Verb' here is a primitive. >> >> 2. Inconvenience, if you want to maintain a set of inhomogeneous states. >> I can do >> >> 'State1A State1B State1C' = (State1A;State1B;State1C) Verb Control >> 'State2A State2B State2C' = (State2A;State2B;State2C) Verb Control >> >> Apart from copying/boxing, there are too many names to keep track of. >> I would rather do >> >> Verb_1_ Control >> Verb_2_ Control >> >> I guess I'm just more familiar with the latter, because it resembles >> a common C function: >> >> void Verb(*Locale, const *Control) >> >> Maybe I'm missing something in J. Please feel free to correct me. >> >> ---------------------------------------------------------------------- >> 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
