Sage Essentials 1.c03

The reset() command can also clear Sage's memory of all definitions that you have made. It is like starting a new Sage session. If you are starting a completely new problem you can use the reset() command to guarantee that there are no leftover definitions from your earlier work.

Since the name y has not been defined in anyway after the reset, Sage echoes with an error.

1. Q&A
Q: Why does Sage not complain the same thing about z ?

A: Sage executes commands sequentially. It stopped after detecting the first error (name 'y' is not defined). So it never executed the command show(z).

2. Notice that Sage complains that we attempted to output y for which Sage does not understand. When we start a new Sage session, y is undefined until it is invoked such as a declaration with var() command or an assignment. The only exception is x which is by default a variable.

Declare y and z as variables.

Assign values for y and z.

Sage Essentials
Section 1: Numerical Calculations

Clearing Variables

Example 3 Clearing all variables at once: the reset() command

Sage Essentials Section 1: Numerical Calculations

Clearing Variables

Example 3 Clearing all variables at once: the reset() command

Sage Essentials
Section 1: Numerical Calculations