Hey
Hay is for horses. You grew up on a farm?
plot (with hoc language from terminal or GUI of NEURON) the input signal of the current I am injecting with a PointProcessManager
Actually, the PointProcessManager isn't injecting any current. What's injecting current is an instance of a point process class that is managed by the PointProcessManager.
The PointProcessManager's "parameters" page will show the name of the object class and its instance. This will be of the form
ClassName[
index]
where
ClassName will be something like IClamp, SEClamp, or AlphaSynapse, and
index will be a nonnegative whole number (0, 1, 2 etc.). Also on that page check the buttons below the object instance name to discover what the point process's current is called (you'll probably see a button labeled
i (nA)).
Next bring up a graph by clicking on
NEURON Main Menu / Graph / Current axis and use its
Plot what? tool to enter the fully qualified name of the variable that you want the graph to plot; assuming that the current is called i, the fully qualified name will be of the form
ClassName[
index].i
Finally dismiss the
Plot what? tool by clicking on its "Accept" button.
For more information see the entry
How do I plot something other than membrane potential? in the FAQ list
https://neuron.yale.edu/neuron/faq/general-questions