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

Dennis Shea shea at ucar.edu
Tue Oct 27 12:59:24 MDT 2015

```YES!!!!    'break' ... sorry!!!!  THX

do i=0,10
do j=0,20
If(a(i).eq.b(j)) then
X = j
break    ; exit 'j' loop; go to 1st statement after the end
of the 'j' loop
end if
end do         ; end 'j' loop
end do            ; end 'i' loop

end do           ; end 'i' loop

On Tue, Oct 27, 2015 at 12:48 PM, 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
>>
>>  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
>>>
>>>
>>>
>>>
>>>
>>>
>>> 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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```