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[ferret_users] How to change the K-index into L-index (time index)



Dear Ferret Users,

I really need suggestion how to change the K-index into L-index (time index) for the followings dataset:

 name     title                                                    I         J            K         L         M         N
 XOUT     longitude
                                        1:186     1:160      ...       ...       ...       ...
 YOUT     latitude
                                          1:186     1:160      ...       ...       ...       ...
 DEPOUT   Mean_water_depth
                       1:186     1:160      ...       ...       ...       ...
 TIME     Time
                                                  ...       ...         1:673     ...       ...       ...
 UMVEL    X-component_of_depth-mean_curre 1:186     1:160    1:673     ...       ...       ...
 VMVEL    Y-component_of_depth-mean_curre 1:186     1:160   1:673     ...       ...       ...
 EFLUX2DU X-component_of_depth-integrated  1:186     1:160   1:673     ...       ...       ...
 EFLUX2DV Y-component_of_depth-integrated  1:186     1:160   1:673     ...       ...       ...
 ZETA     Surface_elevation
                              1:186     1:160  1:673     ...       ...       ...
 ETOT2D   Vertically_integrated_total_ene
        1:186     1:160   1:673     ...       ...       ...
 EDISSIP2D
          Vertically_integrated_energy_di
             
1:186     1:160   1:673     ...       ...       ...

If I'm not changing the K-index into time index (L), I'll need /transpose command for plotting each variable and Ferret always define the variable data as vertical dimension (not as time series as I wish).
And also I couldn't applying plot/vlog appropriately, even by using transpose. There will be a message as followings:
yes? plot/transpose/i=53/j=87/vlog zeta
 **ERROR: value out of legal range: Limits for log axis negative or too small: -1.16 : 1.21

yes? plot/transpose/i=53/j=87/vlog FFTA(zeta)

Bailing out of external function "ffta":
     Time axis must be a regular axis
 **ERROR: error in external function


I would highly appreciate for any help.
Thank you in advance.

Best wishes,

dessy
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