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RE: [ferret_users] set a single point to be zero
Hi Jaci,
Well, specifying i and j alone works fine for me (with
Ferret versions 5.53, 5.80 and 6.00).
use levitus_climatology
let temp0 = IF I EQ 40 AND J EQ 100 THEN 0 ELSE temp
list/k=1/i=40/j=100 temp, temp0
DATA SET: /home/DATA/fer_dsets/data/levitus_climatology.cdf
LONGITUDE: 59.5E
LATITUDE: 9.5N
DEPTH (m): 0
Column 1: TEMP is TEMPERATURE (DEG C)
Column 2: TEMP0 is IF I EQ 40 AND J EQ 100 THEN 0 ELSE TEMP
TEMP TEMP0
I / *: 27.60 0.0000
However, you can also set the default grid for a session by using
"SET GRID" command. You can set the grid using either a variable
name
set grid variablename[d=1]
or by using exact grid name from a ferret session
use levitus_climatology
show grid temp
set grid GMS1
Please have a look at section 'Ref Sec31.5. SET GRID' of user manual
for more details. User manual recommends this command to "Specify the
default grid for abstract expressions".
Hope this helps,
Regards,
Jaison
On Thu, 15 Mar 2007, Jaclyn Brown wrote:
> Thanks for all the advice on this problem.
>
> The solution is:
>
> let uvel_blank = if (i[gx=uvel] eq 59 and j[gy=uvel] eq 93) then 0 else
> uvel
>
> Note that
>
> let uvel_blank = if i eq 59 and j eq 93 then 0 else uvel
> will not work as ferret doesn't know what i and j are.
>
> Cheers,
> Jaci
>
> ----------------------------------------------------------------------------
> On 14Mar 2007, at 12:22 PM, Jaclyn Brown wrote:
>
> > Hi
> >
> > I have a 4-D data file in x,y,z, t and I'd like to change one x-y
> > point to zero to make it a land point.
> >
> > ie. uvel(i=59,j=93)=0
> >
> >
> >
> > I can't find a ferret command that will let me do this.
> >
> > Any ideas?
> >
> > Thanks,
> >
> > Jaci
> >
> >
> >
> > Dr Jaclyn Brown
> >
> > Postdoctoral Associate
> >
> > Dept Geology and Geophysics
> >
> > Yale University
> >
> >
> >
> > Ph. 203 432 1959
> >
> >
> >
> > PO Box 208109
> >
> > New Haven CT 06520
> >
> > USA
> >
> >
> >
> >
>
>
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