Thread: [Matplotlib-users] Adding 2 Line2D objects to a Subplot

Hi everybody

I wanted to collect a combination of plots to insert then in a subplot. 
I choose to create Line2D objects to use the .add_line() method of the 
AxesSubplot class, but unfortunately this does lead to the desired results.

Here my dummy version:

from matplotlib.lines import Line2D
from matplotlib.pyplot import figure, show

import numpy as np

def subplot_foo(n):
     """ returns a the combination of 2 Line2D instances """
     x = np.arange(0, 200, 0.1)
     y = np.random.randn(len(x))
     print len(x)
     #y2 = y+n

     line1 = Line2D(x, y, color = 'k')
     #line2 = Line2D(x,y2, 'r')

     #return line1+line2
     return line1


fig = figure() # create Figure object
for i in range(1,5):
     ax = fig.add_subplot(2,2,i)

     ax.add_line(subplot_foo(i))

show()

First, the Line2D object does not represent the plot I want to create.
Second, I cannot collect various Line2D objects into a Subplot.

Any good idea around?

On Monday, December 20, 2010, Jose Guzman <sjm...@go...> wrote:
>
>
>
>
>
>
>
> Hi everybody
>
> I wanted to collect a combination of plots to insert then in a subplot.
> I choose to create Line2D objects to use the .add_line() method of the
> AxesSubplot class, but unfortunately this does lead to the desired
> results.
>
> Here my dummy version:
>
> from
> matplotlib.lines import Line2D
> from matplotlib.pyplot import figure, show
>
> import numpy as np
>
> def subplot_foo(n):
>     """ returns a the combination of 2 Line2D instances """
>     x = np.arange(0, 200, 0.1)
>     y = np.random.randn(len(x))
>     print len(x)
>     #y2 = y+n
>
>     line1 = Line2D(x, y, color = 'k')
>     #line2 = Line2D(x,y2, 'r')
>
>     #return line1+line2
>     return line1
>
>
> fig = figure() # create Figure object
> for i in range(1,5):
>     ax = fig.add_subplot(2,2,i)
>
>     ax.add_line(subplot_foo(i))
>
> show()
>
> First, the Line2D object does not represent
> the plot I want to create.
> Second, I cannot collect various Line2D objects into a Subplot.
>
> Any good idea around?
>
>
>
>

You might want to look at LineCollection objects.

Ben Root

In article <4D0...@gm...>,
 Jose Guzman <sjm...@go...> 
 wrote:

> Hi everybody
> 
> I wanted to collect a combination of plots to insert then in a subplot. 
> I choose to create Line2D objects to use the .add_line() method of the 
> AxesSubplot class, but unfortunately this does lead to the desired results.
>...

Is the appended closer to what you had in mind?

-- Russell

from matplotlib.lines import Line2D
from matplotlib.pyplot import figure, show

import numpy as np

def subplot_foo(n):
     """ returns a the combination of 2 Line2D instances """
     x = np.arange(0, 200, 0.1)
     y = np.random.randn(len(x))
     print len(x)
     y2 = y+n

     line1 = Line2D(x, y, color = 'k')
     line2 = Line2D(x, y2, color = 'r')

     return line1, line2


fig = figure() # create Figure object
for i in range(1,5):
     ax = fig.add_subplot(2,2,i)

     subplots = subplot_foo(i)
     for subplot in subplots:
         ax.add_line(subplot)

show()