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matplotlib4j
Matplotlib for java: A simple graph plot library for java, scala and kotlin with powerful python matplotlib
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Matplotlib4j is a library which gives you the power!
There is a library in the world that allow you to use CPython from Java code, and this one was a candidate because we can use both Python3 and numpy. However, we had to install a separate environment-dependent library to use JNI, and we also had to install the library from pip on the Python side, which was too much work for something as simple as drawing graphs. So in the end I have decided to implement it independently of these libraries at all.