Re: [Gnuplot-info] re ad a datafile into an array, is it possible?

[Thomas S. <t.s...@fz...>]

sorry, yes, i meant 'stringcolumn(0)'

'stringcolumn(0)' isn't working in gnuplot version 4.4
- here we have to use the sprintf() -,
but in the development version 4.5 it is.


bsmile wrote:
> 
> Dear Thomas,
> 
> I tested the command you suggested, but gnuplot complains that
> columnstring
> command not found, so I changed to stringcolumn command, but it still
> complains that
> 
> "combined_plot_1.gu", line 8: x range is invalid
> 
> but if I change all stringcolumn(0) as stringcolumn(1), then at least it
> works. So it seems to me that stringcolumn(0) cannot be corrected
> executed.
> Am I right?
> 
> Meanwhile, I think of the following as alternative
> 
> p 'aaa.txt' u (cc=sprintf("%i",column(0)), \
>                    vs=vs.'; v'.cc.'='.stringcolumn(1), \
>                    ws=ws.'; w'.cc.'='.stringcolumn(2), \
>                    $1):2 )
> 
> but still it is not as elegant as your previous suggestion, so I hope your
> advice could work out.
> 
> Sincerely,
> Jon
> 
> On Wed, Feb 9, 2011 at 4:38 AM, Thomas Sefzick
> <t.s...@fz...>wrote:
> 
>>
>> use 'columnstring(0)'
>> note: numbering of read in data lines starts with 0
>> (have a look at 'pseudocolumns' in the manual)
>>
>>
>> bsmile wrote:
>> >
>> > Thanks, Thomas, very enlightening! Basically you created a string which
>> > contains the characters forming the commands to create all the
>> variables,
>> > then run the string as a macro.
>> >
>> > A bit further question, what if the data file does not have the first
>> > column, say bbb.txt
>> >
>> > 0.56
>> > 0.45
>> > 0.56
>> > 0.65
>> >
>> > and I still want to read these variables into an array
>> >
>> > v1 = 0.56
>> > v2 = 0.45
>> > v3 = 0.56
>> > v4 = 0.65
>> >
>> > if still follow your logic, I don't have a columnstring(?) to give
>> 1,2,3,4
>> > ..., then what should I do?
>> >
>> > Thanks again,
>> >
>> > Sincerely,
>> > Jon
>> >
>> >
>> >
>> > On Mon, Jan 31, 2011 at 3:33 AM, Thomas Sefzick
>> > <t.s...@fz...>wrote:
>> >
>> >>
>> >> try this:
>> >>
>> >> set macro
>> >> set term dumb
>> >> vs=""
>> >> ws=""
>> >> plot 'aaa.txt' using ( \
>> >>   vs=vs.'; v'.stringcolumn(1).'='.stringcolumn(1), \
>> >>   ws=ws.'; w'.stringcolumn(1).'='.stringcolumn(2), \
>> >>   $1):2
>> >> print "vs: |".vs."|"
>> >> print "ws: |".ws."|"
>> >> @vs
>> >> @ws
>> >> show var
>> >>
>> >>
>> >> bsmile wrote:
>> >> >
>> >> > Dear All,
>> >> >
>> >> > I just asked something about mathematical operation, and Thomas gave
>> me
>> >> > very
>> >> > useful hint. So let me ask something more advanced in my point of
>> view.
>> >> Is
>> >> > it possible to define an array in gnuplot, and read each row of a
>> file
>> >> > into
>> >> > the array, for example,
>> >> >
>> >> > 1  0.56
>> >> > 2  0.45
>> >> > 3  0.56
>> >> > 4  0.65
>> >> >
>> >> > ?
>> >> >
>> >> >>From what I know, I would think of the following
>> >> >
>> >> > p 'aaa.txt' u ( 'v'.$1=$1, 'w'.$1=$1 ):2
>> >> >
>> >> > and it seems that
>> >> >
>> >> > v1=1, w1=0.56
>> >> > v2=2, w2=0.45
>> >> > ...
>> >> >
>> >> > But if I run the code, it fails, complaining that ')' expected
>> >> >
>> >> > Any suggestions?
>> >> >
>> >> > Thanks,
>> >> >
>> >> > Sincerely,
>> >> > Jon
>> >> >
>> >>
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