rectangular patch

Hi all,

I am creating what I would call a simple plot and up until now i have had no complaints. What I need is the ability to place a realtively small horizontal rectangle on the x-axis having never previously used the patches lib's. 8 hours and a slight sense of humour faliure later I am here. I have tried a number of methods now so i am convinced that there is a problem with my matplotlib setup or I am doing something incredably stupid, which I understand from previous experience is the more likely option :slight_smile:

The problem is that I am also getting no output with simpler examples I am creating either. So the question is: I would like to add a simple rectangular box (12,0.01) on a plot similar to that shown below (I have used an example from ipython as I was trying to simplify things), so how would somebody else add a rectangular patch?

from pylab import *
from matplotlib.patches import Rectangle

a=load('NC_figure4.dat', skiprows=(1))
b=load('mean_NC_figure4.dat', skiprows=(1))

ax=a[:,0]
bx=b[:,0]
# ay1=N:C
ay1=a[:,1]
# ay2=average N:C
by1=b[:,1]
# by1=N:C
ay2=a[:,2]
# by2=average N:C
by2=b[:,2]
# cy=difference
cy=b[:,3]

xx1 = subplot(111)
t = arange(0.01, 10.0, 0.01)
scatter(ax, ay1, s=10, c='k', marker='o')
scatter(ax, ay2, s=10, c='b', marker='^')
plot (bx,by1,'k-',markersize=8)
plot (bx,by2,'b-',markersize=8)
plot (bx,cy,'r-',markersize=8)
xlim(-2,48)
ylim(0,0.22)
xlabel('Time [h]',fontsize=20)
ylabel('Elemental N:C [gN/gC]',fontsize=20)
text (32,0.06,'Dark treated',color='k',fontsize=20)
text (32,0.13,'Control',color='b',fontsize=20)
text (32,0.03,'Difference',color='r',fontsize=20)

Rectangle((12,0.01),12,0.01,fill=True, fc='k', visible=True)
show()

Hi all,

I am creating what I would call a simple plot and up until now i have

had no complaints. What I need is the ability to place a realtively

small horizontal rectangle on the x-axis having never previously used

the patches lib’s. 8 hours and a slight sense of humour faliure later

I am here. I have tried a number of methods now so i am convinced that

there is a problem with my matplotlib setup or I am doing something

incredably stupid, which I understand from previous experience is the

more likely option :slight_smile:

The problem is that I am also getting no output with simpler examples

I am creating either. So the question is: I would like to add a simple

rectangular box (12,0.01) on a plot similar to that shown below (I

have used an example from ipython as I was trying to simplify things),

so how would somebody else add a rectangular patch?

from pylab import *

from matplotlib.patches import Rectangle

a=load(‘NC_figure4.dat’, skiprows=(1))

b=load(‘mean_NC_figure4.dat’, skiprows=(1))

ax=a[:,0]

bx=b[:,0]

ay1=N:C

ay1=a[:,1]

ay2=average N:C

by1=b[:,1]

by1=N:C

ay2=a[:,2]

by2=average N:C

by2=b[:,2]

cy=difference

cy=b[:,3]

xx1 = subplot(111)

t = arange(0.01, 10.0, 0.01)

scatter(ax, ay1, s=10, c=‘k’, marker=‘o’)

scatter(ax, ay2, s=10, c=‘b’, marker=’^’)

plot (bx,by1,‘k-’,markersize=8)

plot (bx,by2,‘b-’,markersize=8)

plot (bx,cy,‘r-’,markersize=8)

xlim(-2,48)

ylim(0,0.22)

xlabel(‘Time [h]’,fontsize=20)

ylabel(‘Elemental N:C [gN/gC]’,fontsize=20)

text (32,0.06,‘Dark treated’,color=‘k’,fontsize=20)

text (32,0.13,‘Control’,color=‘b’,fontsize=20)

text (32,0.03,‘Difference’,color=‘r’,fontsize=20)

Replace these:

Rectangle((12,0.01),12,0.01,fill=True, fc=‘k’, visible=True)

show()

With these:

rect = Rectangle((12,0.01),12,0.01,fill=True, fc=‘k’, visible=True)
xx1.add_patch(rect)
show()

Rectangle isn’t like the pylab function. It is a class that creates a Rectangle patch. You need to then manually add this patch to the axes object (xx1 in your script).

Ryan

···

On Wed, Feb 18, 2009 at 1:13 PM, Nicholas Stephens <Nicholas.Stephens@…2159…> wrote:


Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma