Re: reading data with different increment

thanks
when i used the function longFlib i got the following message
lonflip: longitude dimension size must be even: mlon=541
i donot what i have to do with this function have i to cut one point of the
data.

but when i used the following command it works fine
elv = f->z({j1-90:j2:20},{i1-180:i2:20})
i make it add the missed part of the coordinate.
i have attached the image produced .

On Thu, Oct 6, 2011 at 10:38 PM, Adam Phillips <asphilli@ucar.edu> wrote:

> Hi Ahmed,
> I should have added this to my initial reply:
> Make sure to check your data before and after you subscript, to make
> sure you selected the data you wanted. Note also that the orientation of
> your data comes into play here. If, say, your longitudes go from
> -180:180, then coordinate subscripting that you want {0:240} will only
> grab data from 0:180... (I am guessing that this is happening in your
> case.)
>
> So, look at the latitude/longitude span of your data, and make sure your
> specified coordinate subscripts are in the same range. If your
> longitudes go from -180:180, and you want them to go from 0:360, then
> you can use the function lonFlip:
> http://www.ncl.ucar.edu/Document/Functions/Contributed/lonFlip.shtml
> Adam
>
>
> On 10/06/2011 02:30 PM, ahmed lasheen wrote:
> > thanks for your help
> > when i use the bracket , i found that the image is produced for
> > only quarter of the earth (the quarter has positive lat and lon only).
> > i have attached the image produced.
> >
> >
> > On Thu, Oct 6, 2011 at 10:15 PM, Adam Phillips <asphilli@ucar.edu
> > <mailto:asphilli@ucar.edu>> wrote:
> >
> > Hi Ahmed,
> > There are two ways to subscript: by using coordinate values, or by
> using
> > index values. I believe you are confusing the two methods here.
> >
> > Coordinate subscripting uses { } to denote that you are specifying
> > coordinate values (latitude/longitude values in your case)
> >
> > elv = f->z({j1:j2:20},{i1:i2:20})
> > elv = f->z({j1:j2},{i1:i2})
> > elv = f->z({j1:},{:i2})
> >
> > Index subscripting doe not:
> > elv = f->z(0:100:10,5:125:5})
> > elv = f->z(::10,::5})
> > elv = f->z(5::10,5::5})
> >
> > Note that in either case, the specified stride value must be an
> > integer..
> >
> > In your case, I think you want this:
> > elv = f->z({j1:j2:20},{i1:i2:20})
> >
> > Hope that helps..
> > Adam
> >
> > On 10/06/2011 02:04 PM, ahmed lasheen wrote:
> > > Hello all
> > > I am trying to read and plot elevation data in which it's
> > resolution is
> > > 5 minute , and when i plot it keeping in mind maximizing the
> > workstation
> > > size and increasing the cnLevelSpacingF .
> > > when i use the com elv = f->z(::20,::20) , then it works well
> > but when
> > > i use the command elv = f->z(j1:j2:20,i1:i2:20) where j1 is the
> > first
> > > lat ,j2 is the second lat , i1 is the first lon and i2 is the
> > second lon
> > > , then the image produces is wrong .anybody know why , i
> > > have attached the scripts.
> > > thanks
> > >
> > > --
> > > ===============
> > > Ahmed Lasheen
> > > Junior researcher at Cairo Numerical Weather Prediction Center
> > (CNWPC)
> > > Egyptian Meteorological Authority(EMA)
> > > Cairo,Egypt
> > > ===============
> > >
> > >
> > >
> > > _______________________________________________
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> >
> > --
> > ______________________________________________________________
> > Adam Phillips asphilli@ucar.edu <mailto:asphilli@ucar.edu>
> > NCAR/Climate and Global Dynamics Division (303) 497-1726
> > P.O. Box 3000
> > Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli
> > _______________________________________________
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> >
> >
> >
> >
> > --
> > ===============
> > Ahmed Lasheen
> > Junior researcher at Cairo Numerical Weather Prediction Center (CNWPC)
> > Egyptian Meteorological Authority(EMA)
> > Cairo,Egypt
> > ===============
> >
> >
> >
> > _______________________________________________
> > ncl-talk mailing list
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>
> --
> ______________________________________________________________
> Adam Phillips asphilli@ucar.edu
> NCAR/Climate and Global Dynamics Division (303) 497-1726
> P.O. Box 3000
> Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli
> _______________________________________________
> ncl-talk mailing list
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>

-- 
===============
Ahmed Lasheen
Junior researcher at Cairo Numerical Weather Prediction Center (CNWPC)
Egyptian Meteorological Authority(EMA)
Cairo,Egypt
===============

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