Next, identify the solution vector of independent node
voltages V,. This vector contains the number of independent
node voltages given by (1). The node voltages may appear
in any appropriate order in the solution vector. Each groundconnected
voltage source sets a node voltage, so these nodes
are not members of the solution set. Also, floating voltage
sources establish constraints between neighboring node voltages.
These constraints reduce the number of independent node
voltages in the solution vector. Selection of a single node
voltage to retain as the supemode voltage from among a set
of node voltages at a supemode is arbitrary but affects the
form of the equations. This choice may depend on output
considerations. To facilitate the inspection method, mark the
nodes with solution-set node voltages or voltage sources.
Now, write the general nodal analysis KCL matrix equation