Looks like either need to fix J engine or the documentation. On Sat, 26 Feb 2022 at 4:13 AM Raul Miller <[email protected]> wrote:
> I am trying to understand what you mean here. > > Your 'read' verb does not read from memory. Instead, it writes a zero > to an offset in some freshly allocated memory and returns the address > of that allocation. > > Similarly, your 'write' verb does not write to memory. Instead, it > reads characters from the previously allocated memory, up to the point > where it finds a zero (and fortunately, you had ensured that there > would be one when you invoked 'read'). > > Anyways, basically it looks like you've built a small system to read > some arbitrary bytes from memory and then are using them in some > larger algorithm. > > But I am not sure why you would expect an operation which reads > arbitrary memory to be deterministic. > > Have I overlooked something important? > > Thanks, > > -- > Raul > > On Fri, Feb 25, 2022 at 3:01 PM John Ference <[email protected]> > wrote: > > > > Hello, > > Is this construction consistent with the design specs of the memory > > management functions? > > > > s =. 'Hello world' > > > > read =. {{p [ y memw p,0,(>: # y),2 [ p =. mema >: # y}} > > > > write =. {{res [ memf y [ res =. memr y,0,_1,2}} > > > > > > NB. test: > > > > <./ (,. write@read&.> <\ s) = (,. <\ s) > > > > Results are non-deterministic, but the results at the test at the end > > typically return 0. > > > > Visual inspection of the result suggests the capability to auto-append > and > > then auto-find an end-of-string indicator may not be working. > > > > specs: https://code.jsoftware.com/wiki/Guides/DLLs/Memory_Management > > > > Regards, > > John > > ---------------------------------------------------------------------- > > 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
