Having looked at the total number of downloads for all versions of Pandas and downloads by month in the last post, we now come to the total number of downloads by month by version.

The relevant query is

SELECT
STRFTIME_UTC_USEC(timestamp, "%Y-%m") AS yyyymm,
file.version,
FROM
TABLE_DATE_RANGE(
CURRENT_TIMESTAMP()
)
WHERE
file.project = 'pandas'
GROUP BY
file.version,
yyyymm
ORDER BY


which returns a data set, that can be downloaded as a CSV file. The file is available at https://drive.google.com/file/d/0BxwQdgnuTo6JYzR1dUI0Zm5jbWs/view?usp=sharing.

I visualized the data file using Tableau Public, which is the free version of Tableau.

I wanted to use Jupyter widgets or Plotly to make similar interactive plots but I was too lazy and too tired. So, for now, let's make do with the Tableau viz instead.

### Animation using GNUPlot

Animation using GNUPlotI've been trying to create an animation depicting a quasar spectrum moving across the 5 SDSS pass bands with respect to redshift. It is important to visualise what emission lines are moving in and out of bands to be able to understand the color-redshift plots and the changes in it.
I've tried doing this using the animate function in matplotlib, python but i wasn't able to make it work - meaning i worked on it for a couple of days and then i gave up, not having found solutions for my problems on the internet.
And then i came across this site, where the gunn-peterson trough and the lyman alpha forest have been depicted - in a beautiful manner. And this got me interested in using js and d3 to do the animations and make it dynamic - using sliders etc.
In the meanwhile, i thought i'd look up and see if there was a way to create animations in gnuplot and whoopdedoo, what do i find but nirvana!

In the image, you see 5 static curves and one dynam…