1. A computer-implemented method for generating an analysis equation in an electronic-design-automation (EDA) environment, comprising: using one or more processors to display a first window in a graphical user interface (GUI) associated with the EDA environment, wherein the first window includes one or more graphical objects associated with a circuit design, and wherein the one or more graphical objects and associated electrical parameters are configured to be selected by a user using a first user-interface device; using the one or more processors to display a second window in the GUI, wherein the second window includes analysis operations that can be selected by the user; and using the one or more processors to display a third window in the GUI, wherein the third window includes an equation editor that is configured to provide a symbolic representation of the analysis equation based at least on one or more text entries provided by a user using a second user-interface device, user selections of a given graphical object in the one or more graphical objects and an associated electrical parameter, and an analysis operation, thereby facilitating user definition of the analysis equation using textual and graphical information.