Can I change which points are selected programmatically?

Community Support
1

Hi,

I have a scatter plot that gets its data from a ColumnDataSource. Is there a way to change the selected points with my python program, rather than with a selection tool? I can edit the selected indices of the ColumnDataSource like this:

source.selected[“1d”][“indices”] = selected_dict

``

But that doesn’t change the points on the plot.

Thanks,

2

We probably need to make .selected a proper Bokeh model. For now, there is no way to detect changes "inside" the .selected dict. So, short term solution: copy .selected, update the copy, and then reassign entire copy as value of .selected at once. The automagic machinery can detect when .selected changes as a whole.

Bryan

···

On Jun 2, 2016, at 2:08 PM, Yanick MacAngus <[email protected]> wrote:

Hi,

I have a scatter plot that gets its data from a ColumnDataSource. Is there a way to change the selected points with my python program, rather than with a selection tool? I can edit the selected indices of the ColumnDataSource like this:
source.selected["1d"]["indices"] = selected_dict

But that doesn't change the points on the plot.

Thanks,

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3

That worked thanks!

···

On Thursday, June 2, 2016 at 4:26:39 PM UTC-3, Bryan Van de ven wrote:

We probably need to make .selected a proper Bokeh model. For now, there is no way to detect changes “inside” the .selected dict. So, short term solution: copy .selected, update the copy, and then reassign entire copy as value of .selected at once. The automagic machinery can detect when .selected changes as a whole.

Bryan

On Jun 2, 2016, at 2:08 PM, Yanick MacAngus [email protected] wrote:

Hi,

I have a scatter plot that gets its data from a ColumnDataSource. Is there a way to change the selected points with my python program, rather than with a selection tool? I can edit the selected indices of the ColumnDataSource like this:

source.selected[“1d”][“indices”] = selected_dict

But that doesn’t change the points on the plot.

Thanks,

–
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4

Hi Yanick and Bryan,
could either of you please post a working example? I am trying to do the same thing without success. Specifically, what I am trying to do is to drive a data selection by operating a slider that controls a y-axis value (indicated in the plot by an horizontal line). The selection should comprise all data values below/above that y value. I would like to implement the data selection within the Slider.on_change Python callback.

Conceptually, here is what I have (I am running this with >>bokeh serve …):

Data source and plot

source = ColumnDataSource(…)

figure(…).circle(‘x’, ‘y’, source = source, …)

Callback

def slider_selection(attrname, old, new):

# Should update source.selected and 

# trigger the plot update correspondingly

Slider and its callback

max_slider = Slider(start=min(y), end=max(y), value=max(y), step=0.1, title=“Maximum”)

max_slider.on_change(‘value’, slider_selection)

Thanks a lot for any hints!

Gerardo

···

On Thursday, 2 June 2016 22:20:27 UTC+2, Yanick MacAngus wrote:

That worked thanks!

On Thursday, June 2, 2016 at 4:26:39 PM UTC-3, Bryan Van de ven wrote:

We probably need to make .selected a proper Bokeh model. For now, there is no way to detect changes “inside” the .selected dict. So, short term solution: copy .selected, update the copy, and then reassign entire copy as value of .selected at once. The automagic machinery can detect when .selected changes as a whole.

Bryan

On Jun 2, 2016, at 2:08 PM, Yanick MacAngus [email protected] wrote:

Hi,

I have a scatter plot that gets its data from a ColumnDataSource. Is there a way to change the selected points with my python program, rather than with a selection tool? I can edit the selected indices of the ColumnDataSource like this:

source.selected[“1d”][“indices”] = selected_dict

But that doesn’t change the points on the plot.

Thanks,

–
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5

Since I arrived here from Google in 2020, I just wanted to mention that this has been fixed in bokeh long ago - you can now simply modify source.selected.indices and bokeh will update the plot correctly.

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