Texas Instruments TI-82 User Manual - Page 259
Accuracy Information
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Accuracy Information To maximize accuracy, the TI.82 carries more digits internally than it displays. Computational Accuracy Values in memory are stored using up to 14 digits with a 2-digit exponent. ¦ You can store a value in the WINDOW variables using up to 10 digits (12 digits for Xscl, Yscl, Tstep, and qstep). ¦ When a value is displayed, the displayed value is rounded as specified by the MODE setting (Chapter 1), with a maximum of 10 digits and a 2digit exponent. ¦ RegEQ displays up to 14 digits. Graphing Accuracy Xmin is the center of the leftmost pixel, Xmax is the center of the next to the right-most pixel. (The right-most pixel is reserved for the busy indicator.) @X is the distance between the centers of two adjacent pixels. ¦ @X is calculated as (XmaxNXmin)à94. ¦ If @X is entered from the Home screen or a program, then Xmax is calculated as [email protected]. Ymin is the center of the next to the bottom pixel, Ymax is the center of the top pixel. @Y is the distance between the centers of two adjacent pixels. ¦ @Y is calculated as (YmaxNYmin)à62. ¦ If @Y is entered from the Home screen or a program, then Ymax is calculated as [email protected]. Cursor coordinates are displayed as eight characters (which may include a negative sign, decimal point, and exponent). The values of X and Y are updated with a maximum of eight-digit accuracy. minimum, maximum, and intersect on the CALCULATE menu are calculated with a tolerance of 1EL5; dy/dx and ‰f(x)dx use a tolerance of 1EL3. Therefore, the result displayed may not be accurate to all eight displayed digits. (In general, for most functions, there are at least 5 accurate digits.) The tolerance can be specified for the command-line functions fMin(, fMax(, and fnInt( on the MATH MATH menu. Reference Information B-5