Fix error parsing integer in frequency-differencing equation

OSOceanAcoustics / echopype

Enabling interoperability and scalability in ocean sonar data analysis

https://echopype.readthedocs.io/

Apache License 2.0

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Closed leewujung closed 6 months ago

leewujung commented 6 months ago

This PR fixes the bug that the current equation parsing regex pattern does not parse frequencies expressed as integers and not floats.

Two tests re added: one with mixed integers and floats, and one with all integers.