Patent ID: 7499764

Claim:
A computer system configured to receive user input, the computer system comprising: a constraint condition inputting module configured to receive a set of constraints and to store the set of constraints in a memory; a variable value setting module configured to receive a set of variable values referenced by one or more of the constraints in the set of constraints and to store the set of variable values in a memory; a constraint condition extraction module configured to extract one or more of the constraints in the set of constraints which reference variables whose values have been modified; a constraint condition calculation module configured to solve the extracted one or more of the constraints using one or more variables values that have been modified and based on a predetermined order; a variable value resetting module configured to identify variable values that have been modified by the constraint condition calculation module and to electronically communicate to the variable value setting module which variable values have been modified; the constraint condition extraction module further configured to continue extracting one or more of the constraints while there is at least one variable value that has been modified; and wherein the variable value resetting module processes in serial.