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Nodal Analysis Command Line Interface by Jakob Holz 

• Supported component types: Current Source, Resistor, Conductor
• The program can validate the graph and automatically remove floating nodals.
• Print the SLE
• Multiple connections between two nodals are allowed.
• Unlimited nodals

• GraalVM 11 JDK
• GraalVM 20.02 compiler
• Picocli
• Gradle 7.1 for dependency management
• Customised JGraphT library
• Precise component values through BigDecimal
• Custom MathUtil.java

The circuit under test is manually inserted by the user using the command line interface. Control and data inputs are processed using regular expressions. The circuit is represented as a directed weighted graph, which is created live with every input. The graph is validated upon request ("val" control input) or automatically before every compute if a calculation is triggered ("cal" control input). During the validation procedure the user is prompted to fix all errors if any are detected. Once the calculation is triggered the previously created graph is parsed into a system of linear equations (SLE) as per common rules of the nodal analysis. In software this is accomplished by iterating through every edge (component) connected to every vertex (nodal) and adding the edge weight to corresponding index in the array e.g. conductance matrix (For further information on how this is done exactly please see the makeSLE method in the Main.java class). After the matrix has been parsed and checked for symmetry, Cramers method is used to solve the SLE and calculate the individual nodal potentials.