legend with errorbar() problem

Community matplotlib-users
1

Hi,

This script will not show the correct symbol in the legend for any errorbar
plots after the first one. The actual plots do show the correct symbols. I
am using the Enthought Python distribution 2.52001 for windows. I believe
that Matplotlib 0.91 is the included version. The code is as follows:

from pylab import *

x = array([0.01,0.02,0.05,0.1,0.2,0.4,0.75,0.9,0.95,0.975])

y1 = array([97.2136817,57.9900693,20.4359209,9.9532211,4.7415577
,2.286651,1.2720068,1.2496886,1.0442417,1.0214786])

y1e = array([21.24583421,13.52118541,0.64572956,0.101292487
,0.031985423,0.011020589,0.002536264,1.106704045,0.003217541,0.000809814])

y2 = array([95.5086963,52.6831257,20.5578082,9.9830355,4.7549975
,2.2913872,1.272631,1.0931035,1.0457724,1.0231651])

y2e = array([6.369373686,2.21322481,0.27464128,0.085151741,0.034399816
,0.009026401,0.002442033,0.001618337,0.001406813,0.001251265])

eb1 = errorbar(x,y1,y1e, fmt = 'ro')
eb2 = errorbar(x,y2,y2e, fmt = 'gs')

legend([eb1,eb2],['0.00001','0.0001'],numpoints=1)

show()

Thanks for any suggestions.

Wendell Cropper
Associate Professor, Biological Process Modeling

University of Florida
School of Forest Resources and Conservation
214 Newins-Ziegler
PO Box 110410
Gainesville, FL 32611-0410

352-846-0859 phone
352-392-1707 fax

wcropper@...416...
http://www.sfrc.ufl.edu/faculty/cropper/

2

Hi,

Unfortunately, the current legend frame work does not support errorbars.
And I don't think implementing this is easy. The thing is that
errorbar creates multiple artists instead of single one.

The best workaround I can think of is to make the legend only with
markers (and lines if you want), without errorbars.

The return value of the errorbar command is a length 3 tuple, where
the first element is a line2d instance for markers (and lines
connecting markers).

http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.errorbar

Thus, something like below will work.

  legend([eb1[0],eb2[0]],['0.00001','0.0001'],numpoints=1)

-JJ

ยทยทยท

On Tue, Mar 31, 2009 at 11:02 AM, Wendell Cropper <wcropper@...416...> wrote:

Hi,

This script will not show the correct symbol in the legend for any errorbar
plots after the first one. The actual plots do show the correct symbols. I
am using the Enthought Python distribution 2.52001 for windows. I believe
that Matplotlib 0.91 is the included version. The code is as follows:

from pylab import *

x = array([0.01,0.02,0.05,0.1,0.2,0.4,0.75,0.9,0.95,0.975])

y1 = array([97.2136817,57.9900693,20.4359209,9.9532211,4.7415577
,2.286651,1.2720068,1.2496886,1.0442417,1.0214786])

y1e = array([21.24583421,13.52118541,0.64572956,0.101292487
,0.031985423,0.011020589,0.002536264,1.106704045,0.003217541,0.000809814])

y2 = array([95.5086963,52.6831257,20.5578082,9.9830355,4.7549975
,2.2913872,1.272631,1.0931035,1.0457724,1.0231651])

y2e = array([6.369373686,2.21322481,0.27464128,0.085151741,0.034399816
,0.009026401,0.002442033,0.001618337,0.001406813,0.001251265])

eb1 = errorbar(x,y1,y1e, fmt = 'ro')
eb2 = errorbar(x,y2,y2e, fmt = 'gs')

legend([eb1,eb2],['0.00001','0.0001'],numpoints=1)

show()

Thanks for any suggestions.

Wendell Cropper
Associate Professor, Biological Process Modeling

University of Florida
School of Forest Resources and Conservation
214 Newins-Ziegler
PO Box 110410
Gainesville, FL 32611-0410

352-846-0859 phone
352-392-1707 fax

wcropper@...416...
http://www.sfrc.ufl.edu/faculty/cropper/

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