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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: plot datafile with a blank between +- and some data
Date: Thu, 4 Apr 2019 23:47:42 +0200
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Am 04.04.2019 um 10:10 schrieb Jörg Buchholz:
> On 03.04.2019 22:06, Karl Ratzsch wrote:
>> col1(st) = st[1:2] * 1.0
>> col4(st) = (st[28:28] eq "-" ? -1 : 1) * st[29:34]
>> stcol(n) = stringcolumn(n)
>>
>> set table
>> plot $dat us (col1(stcol(1))):(col4(stcol(1))) with table
>> unset table
> 
> 
> Thanks for your solution. There are some more columns. So I think, for
> me, it is easer do handle the datafile with sed.

Me too. If the format is not totally fixed like in your example,
this becomes bedlam with gnuplot string evaluation. Certainly
possible, but it is probably easier to learn regular expressions. :-)