Can I read what opts have been applied to my plot?

HoloViews
1

Hi, I’ve come across this situation twice, where I want to know what options have been passed to an element’s opts.

Suppose I have the following:

scatter = hv.Scatter(df, ‘x’, ‘y’).opts(color=‘red’)

How can I know the value passed to the color option?

Another, more complex use case is if I have some style mapping based on one column:

scatter = hv.Scatter(df, ‘x’, ‘y’).opts(size=hv.dim(‘y’))

and elsewhere I would like to be able to retrieve the result of the operation applied to the ‘y’ dimension without having to compute it again.

Does anyone know if that is possible?

1 Like
2

Hi @Theom,

I think maybe this

scatter.opts.info()
3

Thanks @carl. For me (with holoviews 1.15.1) this does print out the options in Jupyter or a console but returns None.

4

Hi @Theom2,

So looks like info is to display but I think you can do something like

colour = scatter.options.get(‘color’)

Should return a string here

try typing scatter.options. now hit tab should show you some handy stuff

Hope it helps, Carl.

5

Thanks again @carl.

I get an error though. There is no get method for me, neither with holoviews 1.15.1 nor 1.15.4.

Plus trying to see where I can go from .options does not yield much that is interesting:
image

6

Try this (holoviews 1.15.1):

params = scatter.opts.get()
params.options['color']

This returns 'red'

2 Likes
7

With respect to that one:

This here works, but don’t ask me why.

params = scatter.opts.get()
params[0]['size']

returns the dim transform object:
dim('y')

2 Likes
8

Thanks @Jan, it works for me!

Actually I can also get the size option with params.options['size'].

NB: What you get is not the computed result on the y dimension (i.e. not hv.dim('y').apply(dataset)). But that’s already useful.

2 Likes
9

Strange. I get:

The options property may only be used with non-cyclic Options.

Not sure if you now have a newer version than 1.15.1 and that’s why it works for you?

image
image1832×430 50.7 KB

10

Strange indeed! For me it works both with 1.15.1 and 1.15.4.

image

11

Okay. that works for me too. But here comes the crazy part:

If I do this, it works.

scatter = hv.Scatter(df1, 'x', 'y').opts(color='red', 
                                         size=hv.dim('y'))
params = scatter.opts.get()
params.options['size']    # output: dim('y')

If I remove the color='red', it doesn’t work:

scatter = hv.Scatter(df1, 'x', 'y').opts(size=hv.dim('y'))
params = scatter.opts.get()
params.options['size']    # error

Looks like a bug to me.

1 Like