A relatively simple adverb like the one below can be useful if you a
repeatedly trying to access different fields in the table:
NB.*getFields a Returns fields (columns) from y specified in x
NB. EG: 'fieldname' tablehdr getFields table
NB. EG: ('Lastname';'Firstname') hdr getFields dat
NB. y is: table of records
NB. m is: list of boxed field names in y
NB. x is: list of boxed field names to return
getFields=: 1 : 0
:
flds=. boxopen x
idx=. m i. flds
idx {"1 y
)
require 'tables/csv'
'hdr dat'=: split readcsv 'c:/tmp/master.csv'
4{. dat hdr getFields~ 'nameFirst';'birthYear';'weight'
┌──────┬────┬───┐
│Hank │1934│180│
├──────┼────┼───┤
│Tommie│1939│190│
├──────┼────┼───┤
│Don │1954│190│
├──────┼────┼───┤
│Andy │1972│184│
└──────┴────┴───┘
On Tue, Oct 8, 2013 at 11:39 PM, Joe Bogner <[email protected]> wrote:
> Here are a couple other examples:
>
> NB. Convert years to a flat list of numbers
>
> birthYears=. , L:0 (> ". each ((colIdx <'birthYear') {"1 data))
>
>
> NB. Find players born between 1930 and 1950 named Hank
>
> (I. (birthYears > 1930) * (birthYears < 1950) * (names = <'Hank')) { data
>
>
> NB. Find players born between 1930 and 1950 named Hank or Tommie
>
> (I. (birthYears > 1930) * (birthYears < 1950) * ( (names = <'Hank') +
> (names = <'Tommie'))) { data
>
>
>
> NB. http://www.jsoftware.com/jwiki/Essays/DataStructures
>
> diff=: -. [
>
> intersect=: e. # [
>
> union=: ~.@,
>
>
> in=: ] ([: I. =)~ [: < [ NB. 4 : '(<x) ([: I. =) y'
>
> inT=: 4 : 'x in (colIdx <y) {"1 data'
>
>
> NB. Another style
>
> NB. Hank or Tommie - the union of indices
>
> (('Hank' inT 'nameFirst') union ('Tommie' inT 'nameFirst')) { data
>
>
> NB. Hank or Tommie AND born in Cuba
>
> ((('Hank' inT 'nameFirst') union ('Tommie' inT 'nameFirst')) intersect
> ('Cuba' inT 'birthCountry')) { data
>
>
>
> On Tue, Oct 8, 2013 at 3:50 AM, R.E. Boss <[email protected]> wrote:
>
> > So 'data' was plural?
> >
> >
> > R.E. Boss
> >
> > (Add your info to http://www.jsoftware.com/jwiki/Community/Demographics)
> >
> >
> > > -----Original Message-----
> > > From: [email protected] [mailto:programming-
> > > [email protected]] On Behalf Of Henry Rich
> > > Sent: dinsdag 8 oktober 2013 3:52
> > > To: [email protected]
> > > Subject: Re: [Jprogramming] Slicing and dicing tables
> > >
> > > That is what he meant, but it's a minority opinion.
> > >
> > > Henry Rich
> > >
> > > On 10/7/2013 8:56 PM, Dan Bron wrote:
> > > > You mean " 'data' is plural " .
> > > >
> > > > -Dan
> > > >
> > > > PS: http://en.m.wikipedia.org/wiki/Muphry's_law
> > > >
> > > > (Yes, that link is spelled correctly :)
> > > >
> > > > Please excuse typos; composed on a handheld device.
> > > >
> > > > On Oct 7, 2013, at 8:00 PM, Eldon Eller <[email protected]> wrote:
> > > >
> > > >> Data are plural.
> > > >>
> > > >> On 10/07/2013 02:04 PM, Dan Bron wrote:
> > > >>> Ganesh Rapolu
> > > >>>> Because the data is boxed, all comparisons must be boxed.
> > > >>> This was very well put (one short sentence which both clarifies the
> > > >>> problem and justifies the solution).
> > > >>>
> > > >>> -Dan
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> --------------------------------------------------------------------
> > > >>> -- 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
>
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
