This is regrading computation difficulty, There are three variables which are matrices consisting of ten values each, To find out the resultant current all the combination of values ( three variables) must be considered and using resultant matrix we can plot the graph. example: For each value of Ubat combination of RX and RY must be considered. Please find the attached file for reference and kindly do the needful.
If the given network is powered only by the current generator, and the nodes, in the center of the network, are connected to the common, then HV- is at zero potential. Therefore in RYA and R2 the current will never circulate and UBAT will be equal to HV+=(RXA // R1).Isource.