ngspice-bugs

[Shane D. <sd...@do...>]

  Kudos to you folks for building ngspice.  It's really cool.  I think 
it works better in some respects than the commercial software.

  But I stumbled on to a problem.  First, my set-up:

 Running ngspice-17 under cygwin,
 Compiled with "configure --with-x --without-windows".

  Now, my problem:  I was running a transient analysis using iplot on a 
few nodes. When I tried to zoom in on one of these interactive plots, I 
was presented with a continuously scrolling ngspice tty display with 
error messages saying that "xlimit" and "ylimit" were not transient 
analysis nodes nor were various floating point numbers.  (All of these 
statements were true of course.)

  I started digging and found that zoomin() in frontend/plotting/x11.c 
is apparently creating a command that is then parsed to generate the 
appropriate sized plot.  Such a command (I printed from within the 
zoomin function) is shown below.

iplot time xlimit 9.133333e-02 1.260000e-01 ylimit -7.857143e-01 
2.714286e+00

  However, I don't see support for this command syntax in breakp.c under 
the com_iplot() handler function.  But the "plot" command apparently 
supports the "xlimit" and "ylimit" keywords.  So either this is an 
incomplete feature, I'm not looking at the proper code, or there's a 
problem somewhere.

  And why would this one command generated by zoomin() be parsed 
multiple times until the zoomed plot is destroyed?

  Shane