EDGE (EmbeDded Graphing Engine) from Hydrix: possibly the best grapher currently available for both explicit and implicit functions and inequalities - and the prototype is FREE online!īest Integrated Geometry and Graphing (free and online).
Some writings and publications on teaching and learning in a technological age. If it is possible for people to write their own stuff, in something more than a crippled little scripting language, it becomes possible to subvert these testing controls. At the end of a test, the supervisor is required to check the calculator's timer to see if it has not been removed out of "testing mode"." Essentially, because it is commonly used on tests, the educational customers who drive most of the sales(directly or indirectly, some districts purchase, some mandate, some just encourage) would really like the calculator to be a "trusted" black box capable of doing only what it says on the tin, not doing arbitrary computer tasks(like storing notes, or doing symbolic integration and differentiation when the kids are supposed to be learning that). The Wikipedia page mentions several features aimed specifically at educational testing: "The TI-Nspire also features a "testing mode" LED indicator, designed to stop potential cheating, informing test supervisors that the calculator is still denying access to saved files and possibly restricting geometry features on the handheld during the test. Sure, a few of the hardcore nerds in engineering still have their HP somethings, and anybody doing real crunching will graduate to a full computer running one of the mathematical packages but TI is it everywhere else. 
TI's calculator division makes its money(and justifies its margins, I'm not sure that the price of a TI-83 has fallen to anything except inflation since I had to buy one back in secondary school) by being the de-facto standard calculator for education. Either it is reflexive control freakery or, more likely, it has to do with the demands of standardized testing.
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