Edit: The question is answered in a such way that I am happy now, however for the interested ones, the mystery of the question is still on.
These two are the parts from my circuit, related to the question.
Now, I want to be able to plot
V(pnp_c), however it does not allow me to choose it. You can see from the above list that there is not such quantity as
V(pnp_c). If I remove
-9v label, then it allows me to select it. You may say that "they are essentialy the same point, they are at equal potentials, why bother?". My answer to that is, while simulating the power of the pnp by
ALT + left click, Ltspice formulates it so that it will depend the value of
-9v label as follows:
Please note that npn power expression is independent from
V(+9v) instead it is related to
npn_c which is nice.
The problem starts here, If I want to change the power rail to another value, by directly connecting a voltage source, or by changing it with another label, then I also have to replot the power on the pnp. However, if it were be using
V(pnp_c) instead of
V(-9v) then this problem would have been eliminated.
I wanted to think that it just don't accept two nodes with different names and it chooses the constant voltage one, however as you can see from the above picture, for npn, the arrangement is the same but it does not create a problem and recognises
npn_c as a node. Things get more confusing at that point.
So, why I am able to choose
npn_c as a node but cannot choose