Re: [Gnuplot-py-users] Plot list of PlotItems

[Michael H. <mh...@al...>]

On 10/09/2010 11:30 PM, Cuneyt Ertal wrote:
> Hi,
> 
> I wan to plot more than one curve in the same graph using same function
> with different parameters. The following code works without problem.
> 
> from numpy import *
> import Gnuplot
> 
> gp = Gnuplot.Gnuplot(persist=1)
> x = arange(0,1,0.01,dtype='float_')
> d1 = Gnuplot.Data(x, ozfonksiyon(omegalar[0],x), title='1. ozdeger',
> with_='lines')
> d2 = Gnuplot.Data(x, ozfonksiyon(omegalar[1],x), title='2. ozdeger',
> with_='lines')
> d3 = Gnuplot.Data(x, ozfonksiyon(omegalar[2],x), title='3. ozdeger',
> with_='lines')
> d4 = Gnuplot.Data(x, ozfonksiyon(omegalar[3],x), title='4. ozdeger',
> with_='lines')
> d5 = Gnuplot.Data(x, ozfonksiyon(omegalar[4],x), title='5. ozdeger',
> with_='lines')
> gp.plot(d1,d2,d3,d4,d5)
> 
> in this code ozfonksiyon and omegalar are user defined functions. But
> what I want is to create plotitems (d1,d2,d3,d4,d5) in a for loop. I
> modified the code like below,
> 
> for ii in range(n):
>     datalar.append("Gnuplot.Data(x,
> ozfonksiyon(omegalar["+str(ii)+"],x), with_='lines')")
> gp.plot(*datalar)
> 
> I get this error.
> 
> /usr/bin/python -u 
> "/media/disk/doktora_tezi/tek_cubuk/python_files/CALISAN
> KOD/fix_free_controlled_parametrelerin_degisimi_deneme.py"
> 
> gnuplot> plot Gnuplot.Data(x, ozfonksiyon(omegalar[0],x), with_='lines')
> , Gnuplot.Data(x, ozfonksiyon(omegalar[1],x), with_='lines') ,
> Gnuplot.Data(x, ozfonksiyon(omegalar[2],x), with_='lines') ,
> Gnuplot.Data(x, ozfonksiyon(omegalar[3],x), with_='lines') ,
> Gnuplot.Data(x, ozfonksiyon(omegalar[4],x), with_='lines')
>                                                     ^
>          line 0: ':' expected
> 
> What am I doing wrong?

You shouldn't make the elements of the datalar array into strings; leave
them as Python objects:

datalar = []
for ii in range(n):
    datalar.append(
        Gnuplot.Data(x, ozfonksiyon(omegalar[ii],x), with_='lines')
        )
gp.plot(*datalar)

Michael

-- 
Michael Haggerty
mh...@al...
http://softwareswirl.blogspot.com/