mathematical oddity

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That's because it is the default missing-value code. To see this
code, enter Gri and type
<tt>show all</tt>

You may set the missing value to another number by e.g.

<tt>set missing value -999</tt>

NOTE: this 'missing value' system is part of Gri because it is
commonly employed in datasets. Quite often the missing-value
code in datasets is -999 (as above) but I chose a higher number,
because I feared that -999 might come up in real data.

I actually should add a new gri command, of the form
<tt>set missing value none</tt>

in order to turn this effect off... if you want me to do that, please
enter a 'feature request' on this website (at the "Contact" tab).

Thanks. Dan.

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I'm marking this as 'open' again, because I'm going to try a code
change. First I need to query some of the prime Gri users, to see
if they like the new 'set missing value none' syntax that we've
discussed. D.

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The latest CVS version of Gri has been modified to address this issue,
but I would appreciate it if you could check. To do this, follow these
steps (on a linux-like machine):

tar xvfz bug#.tgz
make

where '#' is the bug number, i.e. where the first step is just the
unpacking of the 'tarball' file that I've attached to this message.

Please note: the CVS version is NOT FOR EVERYDAY use. It is just for
testing. It works on your issue AT THE MOMENT when I'm making this
report, but it could fail later, as I (or other developers) change other
things in Gri.

Thanks. Dan.

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works fine:

../../src/gri -directory ../../src bug.gri
1e+19
1e+20
1e+21
1e+22
1e+23
1e+24

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Thanks for the bug report. The current release (as of this
posting)
no longer suffers from the bug you reported.

-- the developer