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In this VegaLite spec the y-axis order of the bottom-most barplot is updated as the data of that plot is filtered based on the selection in the scatter plot. How can I achieve the same resorting behavior for both the blue and orange bars in the top-most bar plot where I have layered the same barplot together with another chart?

I have tried toggling the axis between shared and independent and switching the order of the layer, but that didn't do it. Conceptually I can imagine using a calculate transform to define a new field that is based on the selection and used as the sort order key, but I can't figure out how to write this vega expression string.

Here is that Altair code if anyone prefers to solve it that way:

Is there a way to do something like a rc file with Altair?

I currently create an Altair theme at the beginning of my notebooks (to set up plot size and font size, etc.) and then register and enable it.

I am trying to recreating the classic pyLDAvis visualization for topic modelling in Altair.

I've hit a snag when it comes to filtering. In the pyLDAvis chart, an empty selection in the scatter chart shows the so-called "Default" topic in the right chart which just shows the total frequencies for each word in the corpus.

On the other hand, if you make a selection in the scatter chart, the bar chart is filtered so that it shows the totals for the selection, overlayed against the overall totals as shown below:

I can get close to this, but as you can see below, there are (at least) two differences:

• my filtered bar chart shows all the segments when there is no selection and,
• only one topic is shown when I make a selection (i.e., there is no overlay)

Does anyone know how I could get closer based on the issues above? That is, I'd like to show only the totals when there is no selection and to overlay the selection with the totals when a point is clicked.

Reproducible Altair code below:

I created a simple bar chart based off of synthetic data, generated within the code below (generate_dataframe). The image has a top chart with the data and a lower chart that allows me to drag a selection along the horizontal axis. There appears to be an error: the leftmost bar is not affected by the motion of my selection in the lower plot. I use streamlit to display the plot. Here is an image of what is happening. I list the code below the image. Thanks for any advice.

Image produced when running the code, enhanced to illustrate the issue described above.

I really enjoy using altair. However, sometimes when I plot time, it doesn't show the year and just months. I tried changing the dimensions and still can't get it unless the width is so large it makes the image less user friendly.

I have two concatenated charts built on the same DF. The left one shows a density transform of one data column, the right one shows a scatter plot of aggregates of other data columns.

I would like to do an interval selection on the left side and filter transform the right side accordingly. No matter what I select, however, the right side loses all data points.

Can anyone see what I am doing wrong here?

I am working on a charting module where I can pass on dataframe and the module will create reports based on plots generated by calling few functions as mentioned below.

I am using Altair for plotting and "Datapane" for creating the report, the documentation of the same can be found here : https://datapane.github.io/datapane/

My DataFrame looks like this

Stealing this example, is there any way to selectively suppress some of the elements in the color legend, e.g. to show the legend for the colors in the line but not the band?:

The following expression is available to me in Matplotlib: