Texas Instruments TI-84 PLUS SILV Guidebook - Page 405
Accuracy Information, Computational Accuracy
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Error Type WINDOW RANGE ZOOM Possible Causes and Suggested Remedies A problem exists with the window variables. • You defined Xmax Xmin or Ymax Ymin. • You defined qmax qmin and qstep > 0 (or vice versa). • You attempted to define Tstep=0. • You defined Tmax Tmin and Tstep > 0 (or vice versa). • Window variables are too small or too large to graph correctly. You may have attempted to zoom in or zoom out to a point that exceeds the TI-84 Plus's numerical range. • A point or a line, instead of a box, is defined in ZBox. • A ZOOM operation returned a math error. Accuracy Information Computational Accuracy To maximize accuracy, the TI-84 Plus carries more digits internally than it displays. Values are stored in memory using up to 14 digits with a two-digit exponent. • You can store a value in the window variables using up to 10 digits (12 for Xscl, Yscl, Tstep, and qstep). • Displayed values are rounded as specified by the mode setting with a maximum of 10 digits and a two-digit exponent. • RegEQ displays up to 14 digits in Float mode. Using a fixed-decimal setting other than Float causes RegEQ results to be rounded and stored with the specified number of decimal places. Xmin is the center of the leftmost pixel, Xmax is the center of the next-to-the-rightmost pixel. (The rightmost pixel is reserved for the busy indicator.) @X is the distance between the centers of two adjacent pixels. • In Full screen mode, @X is calculated as (Xmax N Xmin) à 94. In G-T split-screen mode, @X is calculated as (Xmax N Xmin) à 46. • If you enter a value for @X from the home screen or a program in Full screen mode, Xmax is calculated as Xmin + @X É... 94. In G-T split-screen mode, Xmax is calculated as Xmin + @X É... 46. 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. • In Full screen mode, @Y is calculated as (Ymax N Ymin) à 62. In Horiz split-screen mode, @Y is calculated as (Ymax N Ymin) à 30. In G-T split-screen mode, @Y is calculated as (Ymax N Ymin) à 50. • If you enter a value for @Y from the home screen or a program in Full screen mode, Ymax is calculated as Ymin + @Y É... 62. In Horiz split-screen mode, Ymax is calculated as Ymin + @Y ... 30. In G-T split-screen mode, Ymax is calculated as Ymin + @Y É ... 50. Appendix B: Reference Information 398