Re: [Gnuplot-info] how to set xtics using character strings saved in a file

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

you need a dummy plot to set the xtics string.

(1):
$0 is the line number in the data set
there must be no comma at the beginning of the xtics string,
that's the reason for the 'do nothing' (here: copy t onto itself)
for '$0==0'

(2):
no, the alternative is t=t.","
the ternary operator ends at the comma.
yes

(3):
it's good for a meaningless plot without warnings

(4):
yes
no, we have to plot something, either into a table
or into the 'dumb' terminal.

a 'plot nothing' would be something like
plot ... using (...):0/0 ...
but this would give a warning about 'empty range' or so.


bsmile wrote:
> 
> Thank you very much for your interesting code! But the interpretation on
> the
> code is a bit beyond my capability. Here are some questions and I would be
> very glad if there are further explanations.
> 
> (1) what is $0? I only know there is $1,$2, ...
> 
> (2) is     t=t."," , t=t." '".stringcolumn(2)."' ".stringcolumn(1) , $1
> the other alternative for $0==0?
> 
> Does t=t."," , t=t." '".stringcolumn(2)."' ".stringcolumn(1) , $1 actually
> mean three separate commands?
> t=t."," ,
> t=t." '".stringcolumn(2)."' ".stringcolumn(1) ,
> $1
> 
> (3) What's the use of the final $1 in the above command? It does not help
> building t, so does it just help to set up the table?
> 
> (4) Actually the purpose of set table is to construct the macro t, is it?
> If
> the case, is there way to suppress the creation of the table? I mean, can
> there be no output except for generating t?
> 
> Sincerely,
> Jon
> 
> 
> 
> On Thu, Nov 18, 2010 at 1:58 PM, Thomas Sefzick
> <t.s...@fz...>wrote:
> 
>>
>> set macro
>> set table
>> t="("
>> plot 'aaa.txt' using ($0==0?t=t:t=t."," , t=t." '".stringcolumn(2)."'
>> ".stringcolumn(1) , $1):3
>> t=t.")"
>> unset table
>> set xtics @t
>> plot 'aaa.txt' using 1:3
>>
>> pause -1
>>
>> set table
>> t="("
>> plot 'aaa.txt' using ($0==0?t=t:t=t."," , t=t."
>> '".stringcolumn(1)."\n".stringcolumn(2)."' ".stringcolumn(1) , $1):3
>> t=t.")"
>> unset table
>> set xtics @t
>> set bmargin 3
>> plot 'aaa.txt' using 1:3
>>
>>
>> bsmile wrote:
>> >
>> > Hello,
>> >
>> > Suppose I have the following data file, aaa.txt,
>> >
>> > 1  A   0.1
>> > 2  B   0.5
>> > 3  C  0.23
>> > 4  D  0.4
>> > 5  E  0.32
>> > 6  F  0.9
>> >
>> > and I want to use the second column to display at each xtics and
>> replace
>> > the
>> > numbers, so that I get
>> >
>> > |
>> > |     graph displayed here
>> > -----------------------------------------------
>> >  A   B   C   D   E   F  ...
>> >
>> > Or even further
>> >
>> > |
>> > |    graph displayed here
>> > ---------------------------------------------
>> >   1    2    3    4    5    . ....
>> >  A   B    C    E    F    ....
>> >
>> > Is there way to realize these effects?
>> >
>> > Thanks!
>> >
>> > Sincerely,
>> > Jon
>> >
>> ------------------------------------------------------------------------------
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>>
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>> ------------------------------------------------------------------------------
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> ------------------------------------------------------------------------------
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> Spend less time writing and  rewriting code and more time creating great
> experiences on the web. Be a part of the beta today
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> 
> 

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