fn =. < 'C:\Users\skip\J904-user\temp'
this is a folder name
you should give a file name, use something like
fn =. < 'C:\Users\skip\J904-user\temp\foo'
or just
fn =. <'~temp/foo' NB. this work for fwrite but not 1!:2
On Thu, Feb 2, 2023 at 1:16 PM 'Skip Cave' via Programming <
programm...@jsoftware.com> wrote:
> I tried Bill's suggestion:
>
> fn =. < 'C:\Users\skip\J904-user\temp'
>
> fn (fwrite~ 3!:1) {2,\?15#50
>
> _1
>
>
> (3!:2)@fread fn
>
> |domain error
>
> | (3!:2)@fread fn
>
>
> Looks like some kind of write error. Where in the doc are these errors
> defined?
>
> Skip Cave
> Cave Consulting LLC
>
>
> On Wed, Feb 1, 2023 at 11:07 PM bill lam <bbill....@gmail.com> wrote:
>
> > 1!:1 and 1!:2 can only operate on simple strings (rank 1 literal array)
> > You can use 3!:1 and 3!:2 to convert between J array and simple string,eg
> >
> > fn (fwrite~ 3!:1) {2,\?15#50
> >
> > (3!:2)@fread fn
> >
> > this way you need not assign the value of {2,\?15#50 to a name
> >
> > On Thu, Feb 2, 2023 at 12:48 PM 'Skip Cave' via Programming <
> > programm...@jsoftware.com> wrote:
> >
> > > I have a boxed noun:
> > >
> > > ] testfile =: {2,\?15#50
> > >
> > >
> > >
> >
> ┌────┬─────┬─────┬─────┬─────┬─────┬────┬────┬────┬────┬─────┬────┬───┬────┐
> > >
> > > │9 21│21 47│47 37│37 13│13 33│33 20│20 4│4 49│49 6│6 25│25 33│33 9│9
> 6│6
> > > 43│
> > >
> > >
> > >
> >
> └────┴─────┴─────┴─────┴─────┴─────┴────┴────┴────┴────┴─────┴────┴───┴────┘
> > >
> > >
> > > I want to store it in the following location on my machine:
> > >
> > >
> > > ]fn =. < 'C:\Users\skip\J904-user\temp'
> > >
> > > ┌────────────────────────────┐
> > >
> > > │C:\Users\skip\J904-user\temp│
> > >
> > > └────────────────────────────┘
> > >
> > > Then I will close that J session.
> > >
> > >
> > > Later, I will start a new J session, and I want to read that saved file
> > > into a noun called 'test1'
> > >
> > >
> > > What is the J code for writing the noun into a file in the first
> session?
> > >
> > > What is the J code to read the file into a noun in the second session?
> > >
> > > Should I use 1!2 & 1!:1, or fwrite & fread, or something else?
> > >
> > >
> > > Where in the J doc are these file operations and their tradeoffs
> > described?
> > >
> > >
> > > Skip
> > >
> > >
> > > Skip Cave
> > > Cave Consulting LLC
> > > ----------------------------------------------------------------------
> > > For information about J forums see http://www.jsoftware.com/forums.htm
> > >
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
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