If someone was to design essentially a command line based calculator similar to Matlab, without so much of the 'programming' aspect, but focused around electronics, what would you like it to be able to do? What would save you time compared to simply using a scientific calculator, while still keeping a relatively simply interface?

The obvious things to me would be complex numbers in both forms, numeric variables, SI prefixes, constants, unit conversions, simplified parallel calculations for LRC circuits, ability to mix and match bases (bin, hex), boolean logic, function definitions, calculus, and some kind of 'objects' to assist with designing and analyzing the parameters of different kinds of filters, amplifiers etc.

I've been thinking about this as more of just a programming exercise, but the more I consider it the more it seems like I'd actually find this somewhat useful myself as kind of a calculation notepad, which lets me keep track of things better than a scientific calculator, and is less clunky/expensive than matlab for simple things.

Hopefully someone will have some thoughts on this, and quite possibly there's something out there that does just this and more.