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[ferret_users] How to shade/plot by using scaling equation for data in TDS?



Dear Ferret-users,

I would like to ask a little bit silly question, I guess.
After successfull in access and read data from TDS, now I have problem like followings when I tried to shade/plot/contour by applied the scaling question as mentioned in global attributes:

yes? set memory/size=300
yes? go "/home/dessy/Documents/JNLFerret/readsmisst.jnl"
!
!    read data SMI/HDF from TDS
!
use "http://localhost:8080/thredds/dodsC/A20103212010328.L3m_8D_SST4_4"
show data/f
     currently SET data sets:
    1> http://localhost:8080/thredds/dodsC/A20103212010328.L3m_8D_SST4_4  (default)
 
 name     title                             I         J         K         L
 L3M_DATA                                  1:8640    1:4320    ...       ...
               on grid GBA1 with -1.E+34 & NaN for missing data
             X=0.5:8640.5  Y=0.5:4320.5 
 L3M_QUAL                                  1:8640    1:4320    ...       ...
               on grid GBA2 with -1.E+34 & NaN for missing data
             X=0.5:8640.5  Y=0.5:4320.5 
 
let sst=(7.17185E-4*L3M_DATA)-2.0
shade/level=(25,31,1) sst
**ERROR Ferret crash; signal = 11
%

Notes from global attributes of OPeNDAP Dataset Access Form:
Scaling Equation: (Slope*l3m_data) + Intercept = Parameter value
Slope: 7.17185E-4
Intercept: -2.0

Is there any clue of command so I could make the figure from this type of data in Ferret directly?
Any help highly appreciated.

Thank you very much.

Best wishes,

dessy

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