a problem with FFTA

[<arv@xxxxxxx>]

Hi,

I've followed the instructions within the demo file:  ef_fft_demo.jnl

My data is as follows:

yes? show data/variables
     currently SET data sets:
    1> ./sst38N_34N.10W_6W.nc  (default)
     COADS 1-degree Enhanced
 name     title                             I         J        
K         L
 SST      Sea Surface Temperature Monthly  1:4       1:4       ...      
1:456
             degC on grid GOV1 with 650.31 & 32766 for missing data
             X=10W:6W  Y=34N:38N  
 
  time range: 01-JAN-1960 00:00 to 01-DEC-1997 00:00


so I've made:

LET FFT_sst = sst[x=10w:6w@ave,y=34n:38n@ave]
LET FFT_sstfft = ffta(FFT_sst[l=1:456])

then

PLOT FFT_sstfft

and I get:

yes? plot FFT_sstfft

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

Any idea. I think I've set right the time axis and if I plot just
FFT_sst I get the right graphic

Thanks

Antonio Rodríguez