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[ferret_users] reusing information from variable definitions
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- Subject: [ferret_users] reusing information from variable definitions
- From: Marco van Hulten <Marco.Hulten@xxxxxx>
- Date: Mon, 10 Feb 2020 17:46:51 +0100
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Hi all—
I am looking for a way to use information of a variable without user
intervention (in a script). For instance,
let/units="m/s" aa = 123.
let bb = aa + 666.
sh var bb
bb = AA + 666.
Recently, Ansley pointed out that even more information can be
retrieved from variables, e.g. by SHOW VARIABLE/TREE. But can I use
any of this information? Say, that I want to define a third variable
cc as bb but with the units bb's terms that I don't know, so
say `bb,return=original_definition`
aa + 666.
let/title="`bb,return=original_definition`" cc = bb
I also want to get to use aa.units, by referring only to bb (I don't
know aa). If a return function or method exists to retrieve the
information, I could then just spawn AWK:
def symb Units = spawn( "echo '`bb,return=original_definition`' | awk '{ print $1 }'" )
let/title="Original expression: `bb,return=original_definition`"/units="($Units)" cc = bb
To recap: my goal is to get the units from a previous expression; to
that end, I think I need a way to make use of SHOW VARIABLE[/TREE]
information, or even more generally stdout. Is there a last-output
symbol, maybe? (There is FER_LAST_ERROR.)
—Marco
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