Check out Sage, which has an online notebook facility.=20 http://www.sagemath.org/ For "desk calc" and basic math with comprehensive handling of physical=20 units I use the Frink applet. http://futureboy.us/frinkdocs/ I also installed an HP48 emulator for access to its equation library. - Joe Koberg On 8/17/11 10:21 AM, Forrest Christian wrote: > Every time I go through a stage of intense R&D (like I'm dealing with > right now), I get generally frustrated with a lack of a calculator which > actually does the stuff I need it to do without a lot of work. > > I'm looking for either a hardware or software calculator which does > things like ohms law, base conversions, and the 'common' stuff quickly > and easily (read: more efficient than just doing it by hand or with a > 'normal' calculator), but also has a depth of other formulas (for > instance I recently was dealing with capacitor charge and current > through a drain resistor) which can be accessed when needed. Ohms law > is probably a bad example since it is just simple division, although I > will admit it would be really nice to have something which helps prevent > the issues when for whatever reason one's brain pulls the wrong formula > for something rarely used... > > Along those same lines, I occasionally have to manipulate complex > formulas, and just to make thing easier, I'd in the past would use a > copy of derive, which I understand has been swallowed by TI-Nspire. Can > anyone comment on the ease of using Ti-Nspire when manipulating complex > formulas? > > And yes, I can do all of this by hand - which is largely what I'm doing > today, but why should I waste my time? > > -forrest > > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .