tree fc88eef77278668fdfbedcf49995af58d9b34e5c
parent d46994087e91a6ad275e60cf097a5dc1f372a8bf
author Denton Gentry <dgentry@google.com> 1365807429 -0700
committer Denton Gentry <dgentry@google.com> 1365807429 -0700

Add a delta operator

Computes the difference between successive samples.
1. If the value increases, emit the difference.
2. If the value decreases, emit the value.
3. If the value does not change, outputs undefined

This is most useful for a heatgrid of a continuously
increasing counter, to show where the counter changes.