[ncl-talk] usage of "continue" [SEC=UNOFFICIAL]

[Alan Brammer]

In addition to the code Dennis sent.

Simple stand alone example of how the different statements work.


do t=0, 10
if( t .eq. 3 )
   continue
end if
if( t .eq. 6)
   break
end if
print ( (/t/) )
end do

;;; output
0
1
2   ; 3 continued so not printed. but loop "continue"s
4
5   ; 6 break. parent do loop is exited.


On Tue, Oct 27, 2015 at 11:48 AM, David Brown <dbrown at ucar.edu> wrote:

> Hi Dennis,
> Don't you mean "break" rather than "exit"? "exit" would quit the whole
> script.
>  -dave
>
>
> On Tue, Oct 27, 2015 at 12:38 PM, Dennis Shea <shea at ucar.edu> wrote:
> > Actually,
> >
> >    i+=1
> >
> > is not NCL legal.
> >
> > ===
> >
> > This code is certainly not NCL ...
> >
> > Do i=0,10
> >    Do j=0,20
> >       If(a(i).eq.b(j)) then
> >           X = j
> >           Go to 333
> >        End if
> >    End do
> > 333 continue
> > End do
> >
> > BUT
> >
> > do i=0,10
> >    do j=0,20
> >       If(a(i).eq.b(j)) then
> >           X = j
> >           exit        ; exit 'j' loop
> >        end if
> >    end do         ; end 'j' loop
> > end do            ; end 'i' loop
> >
> > The above 'exit' will jump to
> >  end do           ; end 'i' loop
> >
> > On Tue, Oct 27, 2015 at 5:42 AM, Jack Ogaja <jack.ogaja at gmail.com>
> wrote:
> >> Hi Eunpa,
> >>
> >> In this case “continue” is a terminal statement. I suppose in ncl you
> would
> >> substitute that with a “while loop” syntax. For example
> >>
> >> ;———
> >>  i = 0
> >>  do j = n, m
> >>      do while ( i .lt. j)
> >>            X=j
> >>            i+=1
> >>     end do
> >> end do
> >> ;———
> >>
> >> see: http://www.ncl.ucar.edu/Document/Language/loops.shtml
> >>
> >> Jack
> >>
> >>
> >>
> >> On 27 Oct 2015, at 12:15, Eun-Pa Lim <E.Lim at bom.gov.au> wrote:
> >>
> >> Dear Jack
> >>
> >>
> >>
> >> Thanks for your reply J
> >>
> >>
> >>
> >> I was just trying to make very simple do loops looking like this in old
> >> fortran
> >>
> >>
> >>
> >> Do i=0,10
> >>
> >>    Do j=0,20
> >>
> >>       If(a(i).eq.b(j)) then
> >>
> >>           X = j
> >>
> >>           Go to 333
> >>
> >>        End if
> >>
> >>    End do
> >>
> >> 333 continue
> >>
> >> End do
> >>
> >>
> >>
> >> But "Go to " is not a statement used in NCL, and there is not much
> >> explanation about "continue" in the NCL page.
> >>
> >>
> >>
> >> There must be a way to do this in NCL I reckon!
> >>
> >>
> >>
> >> Cheers
> >>
> >>
> >>
> >> Eunpa
> >>
> >>
> >>
> >> Eun-Pa Lim
> >>
> >> Research Scientist
> >>
> >> Seasonal Prediction Science Team
> >>
> >> Centre for Australian Weather and Climate Research (CAWCR)
> >>
> >> Bureau of Meteorology
> >>
> >> Tel: +61-3-9669-4636
> >>
> >> http://www.cawcr.gov.au/staff/elim/index.php
> >>
> >>
> >>
> >> From: Jack Ogaja [mailto:jack.ogaja at gmail.com]
> >> Sent: Tuesday, 27 October 2015 10:10 PM
> >> To: Eun-Pa Lim
> >> Cc: ncl-talk at ucar.edu
> >> Subject: Re: [ncl-talk] usage of "continue" [SEC=UNOFFICIAL]
> >>
> >>
> >>
> >> Really…? I guess it will be easier if you show a piece of ncl script
> which
> >> gives a hint of what you are trying to achieve. In principle if you
> >> understand what “continue” means/does in ‘your preferred' language,
> then I
> >> assume you should be able to implement or know whether it is possible to
> >> implement a similar algorithm in ncl after reading the ncl-statements
> >> documentation and probably going through a few examples.
> >>
> >>
> >>
> >> Or you can just provide a Pseudocode of your intended program to make it
> >> easier for somebody to help.
> >>
> >>
> >>
> >> Jack
> >>
> >>
> >>
> >> On 27 Oct 2015, at 11:12, Eun-Pa Lim <E.Lim at bom.gov.au> wrote:
> >>
> >>
> >>
> >> Hi NCL users,
> >>
> >>
> >>
> >> Could anybody please teach me how to use "continue" in a do loop in
> NCL? I
> >> can't find an example in
> >>
> https://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclStatements.shtml
> >>
> >>
> >>
> >> Many thanks!
> >>
> >>
> >>
> >> Eunpa
> >>
> >>
> >>
> >>
> >>
> >> Eun-Pa Lim
> >>
> >> Research Scientist
> >>
> >> Seasonal Prediction Science Team
> >>
> >> Centre for Australian Weather and Climate Research (CAWCR)
> >>
> >> Bureau of Meteorology
> >>
> >> Tel: +61-3-9669-4636
> >>
> >> http://www.cawcr.gov.au/staff/elim/index.php
> >>
> >>
> >>
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> >>
> >>
> >>
> >>
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