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Using using

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  Using using Dieter Britz <dieterhansbritz@gmail.com> - 2013-08-22 14:24 +0000
    Re: Using using Karl <mail.kfr@gmx.net> - 2013-08-22 17:46 +0200
      Re: Using using Dieter Britz <dieterhansbritz@gmail.com> - 2013-08-23 08:50 +0000
        Re: Using using Christoph Bersch <usenet@bersch.net> - 2013-08-23 11:40 +0200
          Re: Using using Dieter Britz <dieterhansbritz@gmail.com> - 2013-08-23 12:02 +0000
            Re: Using using Dieter Britz <dieterhansbritz@gmail.com> - 2013-08-23 12:44 +0000
            Re: Using using Christoph Bersch <usenet@bersch.net> - 2013-08-23 15:04 +0200

#1992 — Using using

I want to plot column 2 against col. 1, but subtract
a constant from col. 2. I tried, in a test script,

plot 'test.dat' using 1:($2 + 1) w p pt 7

but gnuplot complains

Warning: empty y range [1:1], adjusting to [0.99:1.01]

although the data file contains

1 1
2 2
3 3
4 4
5 5

What am I doing wrong? I read this in the manual:

plot 'file' using 1:($2+$3) "%1f,%1f,%1f"

which led me to use the above. I assume the format stuff
is not needed.

If I am doing this wrong, how do I modify a given column
to be plotted arithmetically?

-- 
Dieter Britz

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#1993

Am 22.08.2013 16:24, schrieb Dieter Britz:
> I want to plot column 2 against col. 1, but subtract
> a constant from col. 2. I tried, in a test script,
> 
> plot 'test.dat' using 1:($2 + 1) w p pt 7
> 
> but gnuplot complains
> 
> Warning: empty y range [1:1], adjusting to [0.99:1.01]
> 
> although the data file contains
> 
> 1 1
> 2 2
> 3 3
> 4 4
> 5 5
> 

You´ve set an xrange that ends between one and two.

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#1995

On Thu, 22 Aug 2013 17:46:37 +0200, Karl wrote:

> Am 22.08.2013 16:24, schrieb Dieter Britz:
>> I want to plot column 2 against col. 1, but subtract a constant from
>> col. 2. I tried, in a test script,
>> 
>> plot 'test.dat' using 1:($2 + 1) w p pt 7
>> 
>> but gnuplot complains
>> 
>> Warning: empty y range [1:1], adjusting to [0.99:1.01]
>> 
>> although the data file contains
>> 
>> 1 1 2 2 3 3 4 4 5 5
>> 
>> 
> You´ve set an xrange that ends between one and two.

No I didn't - I think. Here is the whole script:

gnuplot << eoi
set term postscript enh eps 24
set output 'test.eps'
plot 'test.dat' using 1:($2 + 1) w p pt 7
quit
eoi

What should I be writing if I want the number 1 added to
all the values in column 2? The data file is OK; if I
make that using 1:2 it plots alright.


-- 
Dieter Britz

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#1997

Am 23.08.2013 10:50, schrieb Dieter Britz:
>
> gnuplot<<  eoi
> set term postscript enh eps 24
> set output 'test.eps'
> plot 'test.dat' using 1:($2 + 1) w p pt 7
> quit
> eoi

If you call gnuplot from a shell you should use column(2).

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#1998

On Fri, 23 Aug 2013 11:40:37 +0200, Christoph Bersch wrote:

> Am 23.08.2013 10:50, schrieb Dieter Britz:
>>
>> gnuplot<<  eoi set term postscript enh eps 24 set output 'test.eps'
>> plot 'test.dat' using 1:($2 + 1) w p pt 7 quit eoi
> 
> If you call gnuplot from a shell you should use column(2).

?? I have been using this, e.g. "using 1:3" to override the
default 1:2, for years, and never a problem. Or do you mean
I must use that if I want to manipulate the values in a column?
If so, exactly how do I express that? The manual for 4.6 shows
it as I use it - and I get an error.

-- 
Dieter Britz

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#1999

On Fri, 23 Aug 2013 12:02:04 +0000, Dieter Britz wrote:

> On Fri, 23 Aug 2013 11:40:37 +0200, Christoph Bersch wrote:
> 
>> Am 23.08.2013 10:50, schrieb Dieter Britz:
>>>
>>> gnuplot<<  eoi set term postscript enh eps 24 set output 'test.eps'
>>> plot 'test.dat' using 1:($2 + 1) w p pt 7 quit eoi
>> 
>> If you call gnuplot from a shell you should use column(2).
> 
> ?? I have been using this, e.g. "using 1:3" to override the default 1:2,
> for years, and never a problem. Or do you mean I must use that if I want
> to manipulate the values in a column?
> If so, exactly how do I express that? The manual for 4.6 shows it as I
> use it - and I get an error.

PS: I worked it out, and it works - thanks!


-- 
Dieter Britz

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#2000

Am 23.08.2013 14:02, schrieb Dieter Britz:
> On Fri, 23 Aug 2013 11:40:37 +0200, Christoph Bersch wrote:
>
>> If you call gnuplot from a shell you should use column(2).
>
> ?? I have been using this, e.g. "using 1:3" to override the
> default 1:2, for years, and never a problem. Or do you mean
> I must use that if I want to manipulate the values in a column?

Ok, I wasn't very specific:

If you want to manipulate the values in a column, you can use either 
column(3) or its shorthand $3. However, if you invoke gnuplot from a 
shell using heredocs (<<eoi), like in your example, the $3 is 
interpreted as a shell variable. You could of course escape the dollar 
sign, but IMHO the best way is to use column(3) in that case which makes 
you independent of the environment.

Christoph

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