Re: [Gnuplot-info] multiple axis with constraint

[Hernán G. A. <as...@gm...>]

Dear Martin,

On Tue, Sep 27, 2011 at 14:48, Martin Genet <mg...@lb...> wrote:

> Hi Hernán:
>
> First of all, many thanks for your help.
>
> On 09/26/2011 06:19 PM, Hernán Gonzalo Asorey wrote:
>
>> On Mon, Sep 26, 2011 at 21:30, Martin Genet <mg...@lb... <mailto:
>> mg...@lb...>> wrote:
>>
>>    I have a system with two inputs (i1 & i2), and one output (o).
>>    The two parameters are linked by some kind of constraint (c(i1, i2) =
>> 0).
>>
>>    I have data in the following format: #i1 i2 o.
>>    Of course, I can easily plot o(i1) and o(i2).
>>    I would like to create a plot where I have i1 in x1 axis, and
>> corresponding i2 in x2 axis, while having o in y1 axis.
>>
>> perhaps this:
>> set x2tics
>> set xtics nomirror
>> set xlabel "i1"
>> set x2label "i2"
>> set ylabel "o"
>> plot 'myfile' u 1:3 w l t "o(i1)", '' u 2:3 axes x2y1 t "o(i2)"
>>
>
> However, the problem I see here is that there is no "mapping" between x1 et
> x2 axis, though x2 axis should be a transformation of x1 axis through c
> constraint. Is there a way to put, for each label of x1 axis, a
> corresponding label in x2 axis?
>

As far as I know, you can replace (or also add) major tics manually. For
example (from gnuplot help xtics manual page):

set x2tics (1,2,4,8,16,32,64,128,256,512,1024)

will put x2tics at 2^n, for n=0..10, but you should add them manually. You
can even do this:

f(x)=2**x
set x2tics (f(0), f(1), f(2), f(3))

and so on, but I don't know if there is a way to force the x2tics (or any
other axes tics) directly from a function without specify them in some
sense.

Cheers,

Hernán


Thanks again,
> Martin.
>
>
>
>
>
>
>