Is it possible to overwrite any of these variables:pi, eps, inf, i ? If so, how can it be undone?

Matlab has Built-In Variables like pi=3.1416 eps=2.2204e-16

Answer 1

[Matt Fig]

Those are not variables, but functions.

which pi
which eps

You can mask any function with another function or a local variable. Of course this is a bad habit and many questions on this very site have arisen because people say, "MATLAB is broken, the MAX function doesn't work!" Here's what they did:

max = 0:5;
max(max)  % Oops, this will not find the largest element anymore!

To undo the mask, simply clear the variable. If you have made a function in the local directory with the same name as a MATLAB function, you will have to delete it to undo the masking.