They advertise heavily in education journals. Personal note: Texas Instruments has spent wads of money convincing math teachers that they should be doing this (data collection) instead of teaching actual mathematics. The really fancy ones can be interfaced to data-collection equipment such as range finders and chemical detectors, and then you can use the data collected to plot graphs of real-world phenomena and (again) do some curve-fitting. They can also plot tables of data, and fit functions to curves using least-squares methods. Good graphing calculators allow you to look at the graph in all sorts of ways, to find x- and y-intercepts, maxima and minima of the function, &c. If so: a graphing calculator not only features the usual calculator functions it also plots the graph of various functions: polynomial, trigonometric, exponential, logarithmic.įor example: if I feed it the equation y=x^2+4*x, a graphing calculator will draw the corresponding parabola.
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