Salam,
I have already finished the coding parts and tested the .m files for both Gaussian Elimination and the Successive Relaxation iterative algorithms.
Please send me back a message on my PMB so that I can send you the snapshot of the outputs (the plot and the output file):
For the input part, you said that the circuit part is done, thus, for my codes you just need to introduce the 'R' resistor matrix and vector 'V' of source voltages and you get 'I' vector at output as described).
Please feel free to contact me if you need to discuss any more details.
Awaiting your feedback
Regards.