Hi Roman,
The time coordinates that are listed are always the time in the given
time units, measured from the time origin. If the time origin isn't
explicitly given in the DEFINE AXIS command, then it is assigned
automatically by Ferret. For your axis, it is the start of the
century, so 01-JAN-1610 00 / 1: 3653. is giving us the number of
days since the start of 1600. You can find the time origin with a SHOW
AXIS command:
yes? define
axis/t=01-jan-1610:01-feb-1610:6/unit=day timaxis
yes? show axis timeaxis
name axis # pts start end
TIMEAXIS TIME 7 r 01-JAN-1610 00:00 06-FEB-1610
00:00
T0 = 01-JAN-1600
Axis span (to cell edges) = 42
Or, `var,return=t0`
yes? say `t[gt=timeaxis],return=t0`
!-> MESSAGE/CONTINUE 01-JAN-1600
01-JAN-1600
If you specified a time origin, then it might look like this:
yes? define
axis/t=01-jan-1610:01-feb-1610:6/t0=01-jan-1610/units=day timeaxis
yes? list t[gt=timeaxis]
VARIABLE : T
axis TIMEAXIS
SUBSET : 7 points (TIME)
01-JAN-1610 00 / 1: 0.00
07-JAN-1610 00 / 2: 6.00
13-JAN-1610 00 / 3: 12.00
19-JAN-1610 00 / 4: 18.00
25-JAN-1610 00 / 5: 24.00
31-JAN-1610 00 / 6: 30.00
06-FEB-1610 00 / 7: 36.00
Roman Tonkonojenkov wrote:
Hi
Ferreters,
I have a simple question about the t pseudo-variable. I
wasn't able to find exact answer in the documentation and I have
trouble
understanding what it refers to [please see exaple file below]
I would be
thankful if someone could offer some
clarification...
Sincerely,
Roman
define
axis/t=01-jan-1610:01-feb-1610:6/unit=day timaxis
yes? list
t[gt=timaxis]
VARIABLE : T
axis TIMAXIS
SUBSET : 7 points (TIME)
01-JAN-1610 00 / 1: 3653.
07-JAN-1610 00 / 2: 3659.
13-JAN-1610 00 / 3: 3665.
19-JAN-1610 00 / 4: 3671.
25-JAN-1610 00 / 5: 3677.
31-JAN-1610 00 / 6: 3683.
06-FEB-1610 00 / 7: 3689.
yes? define axis/t=01-jan-1600:01-feb-1600:6/unit=day timaxis
Replacing definition of axis TIMAXIS
yes? list t[gt=timaxis]
VARIABLE : T
&nb! sp; axis TIMAXIS
SUBSET : 7 points (TIME)
01-JAN-1600 00 / 1: 0.00
07-JAN-1600 00 / 2: 6.00
13-JAN-1600 00 / 3: 12.00
19-JAN-1600 00 / 4: 18.00
25-JAN-1600 00 / 5: 24.00
31-JAN-1600 00 / 6: 30.00
06-FEB-1600 00 / 7: 36.00
yes? define axis/t=01-jan-1900:01-feb-1900:6/unit=day timaxis
Replacing definition of axis TIMAXIS
yes? list t[gt=timaxis]
VARIABLE : T
axis TIMAXIS
SUBSET : 7 points (TIME)
01-JAN-1900 00 / 1:! 0.00
07-JAN-1900 00 / 2: 6.0! 0
&nb
sp;13-JAN-1900 00 / 3: 12.00
19-JAN-1900 00 / 4: 18.00
25-JAN-1900 00 / 5: 24.00
31-JAN-1900 00 / 6: 30.00
06-FEB-1900 00 / 7: 36.00
yes? define axis/t=01-jan-1910:01-feb-1910:6/unit=day timaxis
Replacing definition of axis TIMAXIS
yes? list t[gt=timaxis]
VARIABLE : T
axis TIMAXIS
SUBSET : 7 points (TIME)
01-JAN-1910 00 / 1: 3273.
07-JAN-1910 00 / 2: 3279.
13-JAN-1910 00 / 3: 3285.
19-JAN-1910 00 / 4: 3291.
25-JAN-1910 00 / 5: 3297.
31-JAN-1910 00 / 6: 3303.
06-FEB-1910 00 / 7: 3309.
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