Real time data plotting. Update continuously.

[ayanb07]

Is there a real time update code snippet for Hist library? I use matplotlib so can you give code with matplotlib? I want contiuously update the histogram from data acquisition thread and update display from UI thread.

[eduardo-rodrigues]

Hi. Let me explicitly ping @henryiii for this, as he may now see the notification among a flood. Also @amangoel185 and @LovelyBuggies.

[henryiii]

Here's a quick demo. It's just a normal animated Matplotlib plot, and you can get the data for it with .values().

import random

import hist
import matplotlib.pyplot as plt

h = hist.Hist.new.Reg(10,0,1).Double()
out = h.plot()
steps = out[0][0]
plt.ion()
plt.show()

for _ in range(100):
    h.fill(random.gauss(.5, .25))
    values = h.values()
    steps.set_data(values)
    plt.ylim(0, values.max()*1.1)
    plt.pause(.01)

[ayanb07]

Thanks you may modify this answer as import random is not there in this answer.

import hist
import matplotlib.pyplot as plt
import random

h = hist.Hist.new.Reg(10,0,1).Double()
out = h.plot()
steps = out[0][0]
plt.ion()
plt.show()

for _ in range(1000):
h.fill(random.gauss(.5, .25))
values = h.values()
steps.set_data(values)
plt.ylim(0, values.max()*1.1)
plt.pause(.01)

[eduardo-rodrigues]

That was admittedly a trivial import missing ;-). Please close if happy with the feedback.

[henryiii]

Updated, thanks!

[ayanb07]

Can we update the hist object using a streamz api of the python? I am planning on using the Dask streamz or similar way?