gEDA-user: ngspice: how to plot the transistor's characteristic curves

[joseda <josedaniel_martinez@xxxxxxxx>]

Hi,

i'm trying to plot the transistor's characteristic curves but i can't. I can
only plot one curve (for a specific base current). I would like to plot in a
unique graph for several base currents.
This is my netlist (with a current source in the base of the transistor and
a voltage source of 0 V used to measure the current in the collector) 

V1 1 0 DC
Q1 3 2 0 Q2N2222 
.MODEL Q2N2222 NPN (is=19f bf=150 vaf=100 ikf=0.18 ise=50p ne=2.5 br=7.5
+ var=6.4 ikr=12m isc=8.7p nc=1.2 rb=50 re=0.4 rc=0.3 cje=26p tf=0.5n
+ cjc=11p tr=7n xtb=1.5 kf=0.032f af=1)
Vammeter 1 3 DC 0V
I1 0 2 DC 20u
.control
dc V1 0 2 0.05
plot i(vammeter)
.endc
.end

--
This plot the graphic for 1 curve but when i try to plot several curves by
changing i can't.
I changed the line with the dc simulation in something like this:
dc V1 0 2 i1 20u 40u 10u

it takes long time calculating the simulation (i killed the ngspice process
after 5 minutes). What i want is to get the graphic for 20u, 30u and 40u of
the base current 

As always: Thanks in advance!
-- 
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