[ferret_users] Double precision calculations in ferret

[Martin Schmidt <martin.schmidt@xxxxxxxxxxxxxxxxx>]

Hi,
I did not check the manual, but I remember a statement that ferret is 
doing calculations double precision now.

Under this point of view, I cannot understand the following example:
ferret
        NOAA/PMEL TMAP
        PyFERRET v7 (opt)
        Linux 3.19.0-64-generic - 07/01/16
        19-Feb-17 13:28
yes? let a=1+1e-12
yes? list a-1
             VARIABLE : A-1
          1.000E-12
is correct.

yes? let a={`1+1e-1`,`1+1e-8`}
 !-> DEFINE VARIABLE a={1.1,1}
yes? list/prec=12 (a-1)
             VARIABLE : (A-1)
             SUBSET   : 2 points (X)
 1   / 1:  0.100000000000
 2   / 2:  0.000000000000

is not correct. There may be examples, where double precision is needed. 
Could it be that the `a` operator to evaluate reals still gives single 
precision results?

Best,
Martin