I am trying to understand a Spice definition of a circuit and transient analysis on it. I have kind of "inherited" this and can't ask the original creator; my Spice memories from university are pretty rusty, and online manuals have not been of much help.
What I don't understand is the first segment here (snippet of whole file):
.define c1 6926.0 6233.4 7618.6 .define r1 0.16661 0.149949 0.183271 .... il 0 98 dc 0 ac 0 pwl (0s 1720.0a ... 6233s 1718.0a 6925s 1728.0a 7618s 1718.0a ....) ... c01 1 0 [c1] ic= 89.974 r01 1 2 [r1]
In the third segment, I understand that capacitor c01 is defined as lying between nodes 1 and 0 and has initial conditions as given; resistor r01 is situated between nodes 1 and 2. In the second segment, a piecewise linear current source is defined, with ampere values associated with timestamps.
What does the first segment define? The values next to the capacitor seem to be the timestamps from the current source, but why are they used for defining the capacitor/resistor?
I can provide other details as needed, but didn't want to clutter the post too much with useless information.
EDIT: The suggestion given below in comments is good, but my original question still stands. Is this not standard Spice, since no manual mentions it?