gnuplot-info

[Gnuplot-info] multiple axis with constraint

[Martin G. <mg...@lb...>]

Dear GNUPlot:

I have a system with two inputs (i1 & i2), and one output (o).
The two parameters are linked by some kind of constraint (c1(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.
Another way to say it is to have, for each tick in x1 representing i1/i2, the corresponding tick in x2 representing i2/i1 (constraint c1 is fairly easy to solve analytically).
Does it make sense to anyone?

Thanks i advance for your help.
Martin.

Re: [Gnuplot-info] multiple axis with constraint

[Hernán G. A. <as...@gm...>]

On Mon, Sep 26, 2011 at 21:30, Martin Genet <mg...@lb...> wrote:

> Dear GNUPlot:
>
> I have a system with two inputs (i1 & i2), and one output (o).
> The two parameters are linked by some kind of constraint (c1(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.
>

Hi!

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)"

hope this help. See help axes for further info.

 cheers,

Hernán

Another way to say it is to have, for each tick in x1 representing i1/i2,
> the corresponding tick in x2 representing i2/i1 (constraint c1 is fairly
> easy to solve analytically).
> Does it make sense to anyone?
>
> Thanks i advance for your help.
> Martin.
>
>
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Re: [Gnuplot-info] multiple axis with constraint

[Martin G. <mg...@lb...>]

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?

Thanks again,
Martin.

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.
>
>
>
>
>
>
>

Re: [Gnuplot-info] multiple axis with constraint

[Martin G. <mg...@lb...>]

Hi Hernán:

Thanks for your help. I could finally manage to "map" x1 and x2 axis by putting the numbers "by hand" along x2 axis:
set xlabel 'i1'
set xtics nomirror
set x2label 'i2'
set x2tics("i2_value" i1_value_such_as_c(i1_value,i2_value)=0, ...)
These graphs are not easy to do, but they rock like crazy! Thanks again for your help!

Martin.





On 09/27/2011 10:59 AM, Hernán Gonzalo Asorey wrote:
> Dear Martin,
>
> On Tue, Sep 27, 2011 at 14:48, Martin Genet <mg...@lb... <mailto: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...> <mailto: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.
>
>
>
>
>
>
>