airdas airdas - 1 year ago 265
Python Question

How do you add error bars to Bokeh plots in python?

I have successfully plotted several data sets and fitted functions using Bokeh however I really need to add error bars to the graphs, how might I go about doing this?

Answer Source

Maybe its a little late but I wanted to do this today too.

It's a shame that bokeh does not offer this function by itself.

import numpy as np
from bokeh.plotting import figure, show, output_file

# some pseudo data
xs = np.linspace(0, 2*np.pi, 25)
yerrs = np.random.uniform(0.1, 0.3, xs.shape)
ys = np.sin(xs) + np.random.normal(0, yerrs, xs.shape)


# plot the points
p = figure(title='errorbars with bokeh', width=800, height=400)

p.xaxis.axis_label = 'x'
p.yaxis.axis_label = 'y', ys, color='red', size=5, line_alpha=0)

# create the coordinates for the errorbars
err_xs = []
err_ys = []

for x, y, yerr in zip(xs, ys, yerrs):
    err_xs.append((x, x))
    err_ys.append((y - yerr, y + yerr))

# plot them
p.multi_line(err_xs, err_ys, color='red')


And this is the result:


One might want to use it as a function like this:

def errorbar(fig, x, y, xerr=None, yerr=None, color='red', 
             point_kwargs={}, error_kwargs={}):, y, color=color, **point_kwargs)

  if xerr:
      x_err_x = []
      x_err_y = []
      for px, py, err in zip(x, y, xerr):
          x_err_x.append((px - err, px + err))
          x_err_y.append((py, py))
      fig.multi_line(x_err_x, x_err_y, color=color, **error_kwargs)

  if yerr:
      y_err_x = []
      y_err_y = []
      for px, py, err in zip(x, y, yerr):
          y_err_x.append((px, px))
          y_err_y.append((py - err, py + err))
      fig.multi_line(y_err_x, y_err_y, color=color, **error_kwargs)
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