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<@U017UPJEGKZ> Did you place the plot instruction after the dc command?

# analog-design

Stefan Schippers

03/09/2021, 9:27 AM

@User Did you place the plot instruction after the dc command?

Weston Braun

03/09/2021, 7:51 PM

Ah, I did not have the DC command in my control statement but the plot commands were.

Weston Braun

03/09/2021, 7:52 PM

So now the graphs show up, but they have completely wrong values. all the currents are 0

Weston Braun

03/09/2021, 7:53 PM

and running plot commands in the interactive terminal no longer gives correct values either. I am quite baffled

Weston Braun

03/09/2021, 8:03 PM

Some variables seem to not be stored correctly. Is there some different data representation for the DC analysis or something?

Weston Braun

03/09/2021, 8:03 PM

for some vectors it seems to have stored the full sweep, but for others it seems to have only stored the terminal value or something

Weston Braun

03/09/2021, 8:10 PM

Ah, I also had the location of the save commands in the wrong place. It all seems to be working now and I have a better understanding of ngspice. Thanks!

Stefan Schippers

03/10/2021, 5:56 PM

I arrived late, but nice you got it working! I think everyone at some point runs into these 'ordering' issues... 💪

Chris

11/02/2022, 10:10 PM

I know its been really a while and I found this while I encounter the same problem. And to summarise (after hours of head banging): when you are using interactive mode with

.control

and

.endc

block for the commands, making sure your

save all

command is before any analysis (such as

ac

dc

, etc) otherwise you won't get anything for the output and plot (page 400 on section 17.5.64 on the ngspice manual)!

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