Windows lightweight Math Software

Question

I'm looking for lightweight, free, Windows, Math software.
Something I can put an expression and get an answer, or graph it.
I tried Euler, but it is quiet complicated and HUGE.
Basic needs:

1. Expression Based
2. Supports Variables
3. Support Functions, User defined and auto loaded.
4. Supports graphs, 2D. Not really needing 3D.
5. Supports History.

What do you use? What do you recommend?

Answer 1

I'm also interested in answers to this questions!

There is a Power Calculator from MS, but has a lot to be desired.

Answer 2

I haven't personally used CPMP-Tools, but I've heard it referred to as a free CAS.

Answer 3

Graphmatica does a fairly decent job at plotting functions. Not very powerful, but it can graph a lot of functions and their derivatives and such.

Answer 4

In your position, I'd just use an interactive Python shell with Matplotlib. (But then, I'm a computer science guy first and foremost.)

Answer 5

As calculator wxMaxima (screenshots) with export to png and LaTeX syntax.

For playing with graphs I use GeoGebra with export to png, eps, pdf...

For some special cases Wolfram|Alpha.

And also MS Excel.

And also a normal calculator - is often faster than PC programs ;)

Answer 6

I have also found SpeQ Mathematics.

It is very lightweight, starts quickly and has some good functions.

Answer 7

You can try PARI/GP

I am more fan of sage but currently it doesn't natively support your OS, you can try it in a virtual machine.

Answer 8

I'm not sure if it supports user defined functions but I've found Microsoft Mathematics to be extremely useful.