Re: [PyX-user] plot data which is a function of data from 2 files

[Rahul D. <rd...@mo...>]

Hi Will,
Thanks a lot for your help..
I do have question about your code though..Being a newbie, I don't know 
where
to find documentation about functions like columns.update( ) ...
Do you have any pointer where I can find this type of documentation or 
examples
where this code is used ....

Thanks again for your help..

-Rahul.

William Henney wrote:
> Hi Rahul
>
> On Thu, Feb 14, 2008 at 7:50 PM, Rahul Dabane <rd...@mo...> wrote:
>   
>> I'm trying to do something like following...
>>  I've two data files:   file1 and file2 with 2 columns each
>>  file1           file2
>>  d1 t1          x1 y1
>>  d2 t2          x2  y2
>>  d3 t3          x3  y3
>>
>>  I want to plot following type information in addition to plotting file1
>>  and file2 on same plot
>>  f(d1,x1)   f(t1,y1)
>>  f(d2,x2)   f(t2,y)
>>  f(d3,x3)   f(t3,y3)
>>
>>  where f is not complicated...
>>
>>     
>
> There might be a simpler way to do it, but this seems to work:
>
> --------------------- pyx-2file.py ---------------------------
> import pyx
> # Get dict of columns from first data file
> columns = pyx.graph.data.file('f1.dat').columns
> # Merge in columns from second data file
> columns.update(pyx.graph.data.file('f2.dat').columns)
> # Make a PyX data source from the combined dict
> dd = pyx.graph.data.values(**columns)
> g = pyx.graph.graphxy(width=10,
> 		      x=pyx.graph.axis.lin(),
> 		      y=pyx.graph.axis.lin(),
> 		      )
> g.plot([
> 	# Columns from first file
> 	pyx.graph.data.data(dd, x='d', y='t'),
> 	# Columns from second file
> 	pyx.graph.data.data(dd, x='x', y='y'),
> 	# Some function of columns from both files
> 	pyx.graph.data.data(dd, x='d+x', y='t+y'),
> 	])
> g.writePDFfile("pyx-2file")
> --------------------------------------------------------------
>
> ------------------------ f1.dat ------------------------------
> # d t
>   1 10
>   2 20
>   3 30
> --------------------------------------------------------------
>
> ------------------------ f2.dat ------------------------------
> # x y
>   7 17
>   8 28
>   9 39
> --------------------------------------------------------------
>
> HTH
>
> Cheers
>
> Will
>
>
>