Re: How can I generate calander axis?

[Murat Gunduz <gunduz@xxxxxxxxxxxxxxx>]

Hello Ansley Manke,

	Thanks for your explanations.I have one more question.If I had
multiyear (for example 1948-1999) monthly time axis instead of one year,
what would I do to extract the only three months (Dec,Jan,Feb) and put
them in a new axis?.   

Thank you very much in advance for your time and consideration


On Fri, 22 Mar 2002, Ansley Manke wrote:

> Hello Murat,
> I have a couple of ideas for you.
> 
> 1. If you just want to plot the data from December through February,
> you can use the fact that your time axis is a modulo axis.  To draw the
> plot you do not need to regrid the data.
> 
>    yes?  use coads_climatology
>    yes?  plot/x=180/y=0/l=12:15 sst
> 
> 2.  If you need to make a new time axis, you can do that by giving Ferret more
> information about the time steps.  The axis you have defined is what is called
> an abstract axis, where time has no units.  You will want to decide just how to
> define the time steps for your particular application.  SHOW AXIS/T will help you
> with that.  In the example below, I just define an axis with three monthly points.
> The new axis is NOT a modulo axis, since the first point does not come after the
> last point.
> 
> For example, using the coads_climatology data set;
> 
>    yes? use coads_climatology
>    yes? show grid sst
>    yes? show axis/t time
>    yes? set view upper
>    yes? plot/x=180/y=0 sst
> 
>    yes? def axis/t="1-dec-0000":"1-feb-0001":1/edges/units=months/t0="1-JAN-0000 00:00:00" myt
>    yes? let sub_sst = sst[gt=myt]
>    yes? set view lower
>    yes? plot/x=180/y=0 sub_sst
> 
>    yes? sh axis/t myt
> 
> Murat Gunduz wrote:
> 
> > Dear Ferreters,
> >         I am using FERRET v5.40,
> >         after a lot of preprosesing finaly I generate the grid
> >
> > yes? show grid var
> >     GRID (G005)
> >
> >  name       axis        # pts   start           end
> >  (AX008)    LONGITUDE   46 r    15W             70.5E(430.5)
> >  (AX009)    LATITUDE    12 r    30N             50.9N
> >  normal     Z
> >  MONTH_REG  TIME        12mr    16-JAN 06:00    16-DEC 01:20
> >
> >         I want to put the three months (dec-jan-feb) of the "month_reg"
> > axis into the new grid with old x and y axis.
> >
> > yes? define axis/t myt={1,2,12}
> > yes? let new_var=var[gt=myt]
> > yes? show grid new_clim
> >     GRID (G006)
> >  name           axis       # pts   start        end
> >  (AX008)        LONGITUDE  46 r    15W          70.5E(430.5)
> >  (AX009)        LATITUDE   12 r    30N          50.9N
> >  normal         Z
> >  MYT            T           3 i     1           12
> >
> >         This worked,but the problem is there is no calendar label
> > of t axis. How can i say ferret to put the names of the months,
> > that is DEC,JAN,FEB,  to the "myt" axis.
> >
> > Thank you in advance
> >
> > Murat GUNDUZ
> > Institute of Marine Science
> > METU, TURKEY
> 
> --
> Ansley Manke  Pacific Marine Environmental Laboratory  Seattle WA  (206)526-6246
> 
>