# [ncl-talk] Enquiries on vector plottting

KO Chiam kochiam at gmail.com
Sun Jun 28 00:15:13 MDT 2015

```Dear Sirs,

Thank you very much for all the help. It really helps me a lot.
Thank you.

Best Regards,
Keng-Oon

On 27 June 2015 at 05:05, David Brown <dbrown at ucar.edu> wrote:

> Actually, there is a very simple way to equalize the length of the
> vectors with no need to modify the data.
> There is a resource called vcMinFracLengthF that specifies the length
> of the minimum magnitude vector as a fraction of the maximum magnitude
> vector. Setting it to 1.0 will make all the vectors the same length.
>  -dave
>
> On Fri, Jun 26, 2015 at 10:48 AM, Adam Phillips <asphilli at ucar.edu> wrote:
> > Hi Keng-Oon,
> > For the high and low labels: See examples 1 and 2 from the satellite
> > applications page here:
> > http://www.ncl.ucar.edu/Applications/satel.shtml#ex2
> >
> > There are a whole suite of cnHigh* and cnLow* resources.
> >
> > If you are interested in identifying local highs and lows you can use the
> > local_min and local_max functions:
> > http://www.ncl.ucar.edu/Document/Functions/Built-in/local_max.shtml
> > http://www.ncl.ucar.edu/Document/Functions/Built-in/local_min.shtml
> >
> >
> >
> > On Fri, Jun 26, 2015 at 10:38 AM, Rick Brownrigg <brownrig at ucar.edu>
> wrote:
> >>
> >> Hi,
> >>
> >> One thing that comes to mind is to simply normalize your vector data
> prior
> >> to plotting. You would then use the vcRefLengthF resource to control
> how big
> >> the vectors are in the plot.  There are plenty of examples on the
> examples
> >> page, a basic one being veceff_1.ncl.
> >>
> >> http://ncl.ucar.edu/Applications/veceff.shtml
> >> http://ncl.ucar.edu/Document/Graphics/Resources/vc.shtml
> >>
> >>
> >> I don't know about the Sea Level plot -- perhaps someone else can
> comment
> >> on that.
> >>
> >> Rick
> >>
> >>
> >> On Fri, Jun 26, 2015 at 7:41 AM, KO Chiam <kochiam at gmail.com> wrote:
> >>>
> >>> Dear Sir/Mdm,
> >>>
> >>> I am new to NCL and would appreciate if you can help address the
> >>> following queries. Please pardon me if they sounds too simple.
> >>>
> >>> I would like to plot vectors (basically wind data) using arrows but I
> >>> would like the arrows to be of equal length, in other words, I am only
> >>> interested in the direction but not the magnitude. May I know if there
> is a
> >>> way to do this?
> >>>
> >>> Also, is there already a function call to identify and plot the high
> and
> >>> low pressure of a mean sea level chart?
> >>>
> >>> The version of NCL I am using is v6.3.0.
> >>>
> >>> Thank you very much for your time and help.
> >>>
> >>> Best Regards,
> >>> Keng-Oon
> >>>
> >>> _______________________________________________
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> >>> ncl-talk at ucar.edu
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> >>>
> >>
> >>
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> >
> >
> >
> > --
> > Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
> > www.cgd.ucar.edu/staff/asphilli/   303-497-1726
> >
> >
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