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Handling High Values with Pixels Per Unit

Preamble

In [5]:
from plotapi import Terminus

Terminus.set_license("your username", "your license key")

Introduction

Let's look at one approach to handling data with very high values or many sources and targets.

For example, if we had a dataset that included values that were in the millions, Terminus may end up trying to process and display a million or more pixels on-screen simultaneously. The result would likely be crashing the tab or browser! Whilst that can be managed with the previously discussed pixel_batch_size and pixel_journey_duration, that approach will likely result in an animation that lasts too long.

Instead, we can start representing more than $1$ "unit" of our value per pixel. For example, we could use one pixel to represent $10$, $100$, or even $1000$ units of our value.

Let's demonstrate this with a high-value dataset.

As we can see, we have set our license details in the preamble with Terminus.set_license().

Dataset

Terminus expects a list of dictionary items, these will define the flow of pixels between a source and a target.

In [3]:
links = [
    {"source":"England", "target":"Germany", "value": 100000},
    {"source":"England", "target":"France", "value": 300000},
    {"source":"England", "target":"Spain", "value": 500000},
    {"source":"England", "target":"Italy", "value": 400000},
    {"source":"England", "target":"Japan", "value": 8000},

    
    {"source":"Ireland", "target":"Germany", "value": 350000},
    {"source":"Ireland", "target":"France", "value": 375000},
    {"source":"Ireland", "target":"Spain", "value": 175000},
    {"source":"Ireland", "target":"Italy", "value": 5000},
    {"source":"Ireland", "target":"Japan", "value": 40000},
]

We can add many source's and target's! As they increase, we may need to adjust Terminus layout properties to accomodate the diagram's size and throughput.

Visualisation

We can see that we're working with a dataset that contains higher values than usual. Let's address this by setting pixels_per_unit=100, which means we'll be representing $100$ units with a single pixel, rather than $100$ units with $100$ pixels. We'll also need to increase the stats_text_width to make enough space for the bigger numbers.

Here we're using .show() which outputs to a Jupyter Notebook cell, however, we may want to output to an HTML file with .to_html() instead. More on the different output methods later!

In [13]:
Terminus(links, stats_text_width=100, colors="warm",
         pixels_per_unit=100).show()
Plotapi - Terminus Diagram

You can do so much more than what's presented in this example, and this is covered in other sections. If you want to see the full list of growing features, check out the Plotapi API Documentation.

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