ColumnDataSource and hbar

Community Support
1

Hi,

Ive been struggling to put together a working example for an hbar that gets its data from a columndatasource.

Im using bokeh 0.12.3 . Using an hbar as in

plot.hbar( right=[10,20,30,40,50], y=[1,2,3,4,5],height=1)

``

···

works just as expected. Trying the same with

mysource = ColumnDataSource(data=dict(right=[10,20,30,40,50],y=[1,2,3,4,5]))
plot.hbar(‘right’,‘y’,source=mysource)

``

doesn’t work at all. I’ve been at this problem for a better part of a day now and can’t seem to

a) find a working codeexample

b) understand the reference

c) get it working by trial and error

If any of you can show me how this might work, i’d really appreciate it. A

2

It's probably best to be explicit with keyword arguments:

  plot.hbar(right='right', y='y', source=mysource)

You might also need to supply height=1 (or whatever)? Not sure what the default height is if you don't supply one.

There is an "order" that positional arguments are taken in, but it's not always obvious. I always use keyword arguments for any glyph that has more than simple (x,y) coordinate properties.

thanks,

Bryan

···

On Oct 18, 2016, at 5:30 PM, Rudelwolf <[email protected]> wrote:

Hi,

Ive been struggling to put together a working example for an hbar that gets its data from a columndatasource.
Im using bokeh 0.12.3 . Using an hbar as in

plot.hbar( right=[10,20,30,40,50], y=[1,2,3,4,5],height=1)

works just as expected. Trying the same with

mysource = ColumnDataSource(data=dict(right=[10,20,30,40,50],y=[1,2,3,4,5]))
plot.hbar('right','y',source=mysource)

doesn't work at all. I've been at this problem for a better part of a day now and can't seem to

a) find a working codeexample
b) understand the reference
c) get it working by trial and error

If any of you can show me how this might work, i'd really appreciate it. A

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3

Hi,

My current solution (which works, surprisingly) is as follows:

x_data = numpy.random.uniform(0,20,5)
y_data = range(0,5)
plot = Figure(plot_width=600, plot_height=600, x_range=[0,20], y_range=[0,5])
source = ColumnDataSource(data=dict(y=y_data, right=x_data))
myglyph = HBar(y='y', right='right', left=0, height=0.8)
plot.add_glyph(source, myglyph)

which requires

from bokeh.models.glyphs import HBar

I’ll check your hint and get back to you tomorrow, thanks.

···
4

Not sure why you’re surprised.

p = figure(…)

      p.hbar(...)

      is just a slightly

shorter syntax convenience that does what you’ve written below.

···

On 10/18/16 4:18 PM, Rudelwolf wrote:

Hi,

      My current solution (which works, surprisingly) is as

follows:

x_data = numpy.random.uniform(0,20,5)
y_data = range(0,5)
plot = Figure(plot_width=600, plot_height=600, x_range=[0,20], y_range=[0,5])
source = ColumnDataSource(data=dict(y=y_data, right=x_data))
myglyph = HBar(y='y', right='right', left=0, height=0.8)
plot.add_glyph(source, myglyph)

which requires

from bokeh.models.glyphs import HBar

I’ll check your hint and get back to you tomorrow, thanks.

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–
Sarah Bird
Developer, Bokeh