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dd test 2 with .func
V1 1 0 dc 0 pulse 0 2 0 1 1 1 4
B2 2 0 v = ddt(V(1))
B3 3 0 v = border(v(1))
.func border(x) if (ddt(x) > 0, 1, 0)
.tran 1m 8
.control
run
plot v(1) v(2) v(3)
.endc
.end