# E-Z Solve

E-Z Solve is a numerical computing environment. Created by Intellipro, Inc., E-Z Solve allows the user to write virtually any combination of differential equations (ODE's) and algebraic equations, including parameters, user-defined functions and lookup tables.

According to the developer, other features include:

• the ability to create user-defined functions implementing logic and looping structures to be referenced in equation sets;
• the capacity to store multiple equation sets in one file (or session), providing an excellent tool for comparing results from different models;
• the "Sweep" function, which provides the capability of solving the system for a set of varying parameters and/or initial conditions;
• the ability to view solution results in a spreadsheet link data grid, or graphically on 2D and 3D graphs;
• the capacity for plotting any number and combination of variables and their functions, on 2D and 3D graphs, to produce component-vs-time, phase-plane or any type of user-defined graph.

E-Z Solve offers some variety in numerical methods, including the Euler method, the Runge-Kutta (4,5) pair, Adams-Moulton orders 1-12 and BDF orders 1-5. (By comparison, MATLAB, offers only the Runge-Kutta (2nd & 3rd) and (4th & 5th) order methods).

However, the processing capacity of E-Z Solve would be inadequate for anything but medium-scale projects, as the number of variables per session is limited to 50, and the number of first-order differential equations cannot exceed 30.

Additionally, E-Z Solve has relatively obscure error messages, and it sometimes seems to struggle even with linear equations. A sample error message can be seen here. The descriptive text reads as:

"Error. Out of range."

Consulting the software's documentation results in 0 matches for the error message.

Sometimes even seemingly innocuous functions such as:

$quad B(a)=670$
$quad G=e^{frac{B}{127}}$