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The tran Command

The tran command initiates transient analysis of the current circuit.

tran tran_args [dc dc_args]
The arguments are the same as those of a .tran line (see 2.7.9). Output is retained at tstart, tstop, and multiples of tstep in between, unless the variable steptype is set to nousertp. In this case, output is retained at each internally generated time point in the range. If a dc sweep specification follows, the transient analysis is performed at each sweep point.

Stephen R. Whiteley 2017-02-22