multiple plotting but not with static inputs but using a control inputs once.

[professional]

I want to plot SCR Char for different value of the trigger current so,
what i want is each time i  take different value of the trigger
current from the user, and calculate the corresponding forward current
and voltage etc. it should plot  the V--I for all these values at the
same time,(for comparative study) that is the trigger current should
be the controlling element