Re: [Ngspice-devel] How are initial conditions integrated into the Matrix?

[<mh...@ia...>]

> If initial conditions are set,
> there is no DCOP performed, but skipped and a user-suppliued
> 'solution' is used instead. OK, that makes sense.
> Please correct me if I'm wrong though.

The CKTop() analysis *always* runs before a transient starts.
On UIC it takes the user's initial conditions as the first
iteration and fills in the missing nodes and KCLs from
there (as not all are normally specified).

That OP runs can be seen from the code that is enabled when
HAVE_PROGREP is enabled at compile time. (Normally a message
to this effect is displayed in the window's status bar). There
is no option to turn off the .OP for a .TRAN analysis, but
.option noopac turns it of for a .AC .

-marcel