Re: gEDA-user: can't plot time on x axis with KJWave

[Mark Johnson <mrj001@xxxxxxx>]

KURT PETERS wrote:
>    > > > KURT PETERS wrote:
>    > > > > > Date: Sun, 02 Aug 2009 19:05:03 -0600
>    > > > > > From: Mark Johnson <mrj001@xxxxxxx>
>    > > > > > Subject: gEDA-user: can't plot time on x axis with KJWave
>    > > > > > To: gEDA user mailing list <geda-user@xxxxxxxxxxxxxx>
>    > > > > > Message-ID: <4A7637BF.1020004@xxxxxxx>
>    > > > > > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>    > > > > >
>    > > > > > I've been trying to get a plot of a transient analysis with
>    KJ
>    > > > > Waves.
>    > > > > > I've gotten the analysis to run. When the "Select Axis
>    > > Variables"
>    > > > > > window appears, time is not an option under X axis. I can
>    only
>    > > plot
>    > > > > the
>    > > > > > output I chose prior to the simulation - on both x- and
>    y-axes.
>    > > > > > Needless to say, this doesn't help me much.
>    > > > > >
>    > > > > > I'm using version 1.1.3 of KJ Waves, recently downloaded,
>    and
>    > > > > version
>    > > > > > 6u12 of the Java Runtime (included as part of the JDK).
>    > > > > >
>    > > > > > Can anyone help?
>    > > > > >
>    > > > > > Mark Johnson
>    > > > > Mark,
>    > > > > Can you post the first few lines (which should be in red) in
>    your
>    > > > > KJWaves netlist?
>    > > > > What I'd be looking for is to ensure you indeed are asking
>    ngspice
>    > > for
>    > > > > a transient analysis and what variables you're asking it to
>    store.
>    > > > > Kurt
>    > > > >
>    > > > Here it is:
>    > > > * gnetlist -g spice-sdb -o test3h.net test3.sch
>    > > > .TRAN 10.0U 10.0M 10.0U 10.0U
>    > > > .SAVE V(Vout)
>    > > > .OPT NOPAGE NOMOD
>    > > > .WIDTH OUT=133
>    > > > *********************************************************
>    > > >
>    > > > I'm assuming that ngspice automatically will save the time as it
>    > > does
>    > > > for .print. I'm using rework 19 of ngspice.
>    > > >
>    > > > Mark
>    > > Mark,
>    > > I would not assume that.
>    > > To determine whether that's the problem, how about trying to
>    > > comment the '.SAVE' statement out once and see if time shows up?
>    It
>    > > might create a gargantuan file depending on how much you're
>    > > simulating, but I think KJWaves can handle pretty big files.
>    > >
>    > > I also notice that you use the .TRAN with a start time and a TMAX
>    > > time. I'm not sure you might want to use those initially. If the
>    > > above doesn't give you a "time" selection, how about trying the
>    .TRAN
>    > > statement with only the "typical" TSTEP and TSTOP times specified?
>    > > Kurt
>    > >
>    > If I comment out the .SAVE, it does create a much larger file
>    (almost
>    > 50Meg). That took quite a while to load. Now, it does not offer any
>    > options for either the x- or the y-axis when I select "transient
>    > analysis" on the left. I should note that there two "transient
>    > analyses" on the left. One is from the one I specified through
>    KJWaves;
>    > the other via an include file. It has the same .TRAN line as the
>    first,
>    > but includes a .PRINT, and sets some options.
>    >
>    > Restoring the .SAVE line and changing the .TRAN line as suggested
>    leads
>    > to this:
>    > * gnetlist -g spice-sdb -o test3h.net test3.sch
>    > .TRAN 10.0U 10.0M
>    > .SAVE V(Vout)
>    > .OPT NOPAGE NOMOD
>    > .WIDTH OUT=133
>    >
>    > Now, I still don't get any options to plot for either axis.
>    >
>    > Aha! You did give me the clue though. That first test made me wonder
>    > if perhaps my .INCLUDE was interfering. So I commented that out and
>    it
>    > works!
>    >
>    > Thanks. This should make my plotting much easier.
>    >
>    > Mark
>    Mark,
>      I'm glad you were able to work it out.  I'm curious as to what
>    .INCLUDE did.  DId you NOT include a file necessary for simulation?
>    We don't want that.  Or did you just comment that "extra" .TRAN in the
>    included file?
>
>    Regards,
>    Kurt
>   
The include file included the .TRAN and .PRINT commands and a few 
options I was using when running ngspice from the command line.  I had 
changed the method to GEAR from the default, but that turned out not to 
be essential.

Mark



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