On Aug 27, 2015, at 10:03 AM, Nathan Chew <chew.jingwei@gmail.com> wrote:

Good Day,

I am trying to plot multiple live streaming data points in a single bokeh plot but i'm not really sure how i should go about doing it.

I have managed to get two live stream data to be plotted simultaneously but i'm trying to get them into the same figure for comparison.

I would appreciate it if someone could point me in the right direction. Thanks!

* below is the snippet of what i have tried to do, two separate live plots.

# plot settings
plot_stream1 = figure(title="Test Stream 1")
plot_stream1.line(x, y, color="blue", name='Sample Streaming Data 1')

plot_stream2 = figure(title="Test Stream 2")
plot_stream2.line(x, y, color="red", name='Sample Streaming Data 2')

# plot live streaming data
show(VBox(plot_stream1, plot_stream2))

# set up glyph renderer
ds1 = plot_stream1.select({"type": GlyphRenderer})[0].data_source
ds2 = plot_stream2.select({"type": GlyphRenderer})[0].data_source

while True:
    
    counter += 1

    # get new data and time-stamp
    data = test_data[counter]
    time_point = time.time() - start_time

    # update data into ds
    ds1.data["x"].append(time_point)
    ds1.data["y"].append(data)

    ds2.data["x"].append(time_point)
    ds2.data["y"].append(data + 300)

    # update live stream with new data
    ds1._dirty = True
    cursession().store_objects(ds1)

    ds2._dirty = True
    cursession().store_objects(ds2)

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On Thursday, 27 August 2015 19:35:51 UTC+8, Bryan Van de ven wrote:

Put the lines on the same plot, and use the renderer name to query with select, so you can get the appropriate different data source for each:

    # plot settings

    plot = figure(title="Combined Streams")

    plot.line(x, y, color="blue", name='Sample Streaming Data 1')

    plot.line(x, y, color="red", name='Sample Streaming Data 2')



    show(plot)



    ds1 = plot.select({"name": 'Sample Streaming Data 1'})[0].data_source

    ds2 = plot.select({"name": 'Sample Streaming Data 2'})[0].data_source

Also note, you can do:

    cursession().store_objects(ds1, ds2)

in one call, and should not need to mark anything _dirty, either.

Bryan

On Aug 27, 2015, at 10:03 AM, Nathan Chew chew.j...@gmail.com wrote:

Good Day,

I am trying to plot multiple live streaming data points in a single bokeh plot but i’m not really sure how i should go about doing it.

I have managed to get two live stream data to be plotted simultaneously but i’m trying to get them into the same figure for comparison.

I would appreciate it if someone could point me in the right direction. Thanks!

• below is the snippet of what i have tried to do, two separate live plots.

plot settings

plot_stream1 = figure(title=“Test Stream 1”)

plot_stream1.line(x, y, color=“blue”, name=‘Sample Streaming Data 1’)

plot_stream2 = figure(title=“Test Stream 2”)

plot_stream2.line(x, y, color=“red”, name=‘Sample Streaming Data 2’)

plot live streaming data

show(VBox(plot_stream1, plot_stream2))

set up glyph renderer

ds1 = plot_stream1.select({“type”: GlyphRenderer})[0].data_source

ds2 = plot_stream2.select({“type”: GlyphRenderer})[0].data_source

while True:

counter += 1

# get new data and time-stamp

data = test_data[counter]

time_point = time.time() - start_time

# update data into ds

ds1.data["x"].append(time_point)

ds1.data["y"].append(data)

ds2.data["x"].append(time_point)

ds2.data["y"].append(data + 300)

# update live stream with new data

ds1._dirty = True

cursession().store_objects(ds1)

ds2._dirty = True

cursession().store_objects(ds2)

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