Texas Instruments TI-82 User Manual - Page 254

Table of Variables The variables listed below are used by the TI.82 in various ways. Some have restrictions on their use. User Variables The variables A through Z and q are defined as real numbers. You may store to them. However, the TI.82 can update X, Y, R, q, and T during graphing, so you may wish to avoid using these variables for nongraphing activities. The variables L1 through L6 are defined as lists. You cannot store another type of data to them. The variables ãAä, ãBä, ãCä, ãDä, and, ãEä are defined as matrices. You cannot store another type of data to them. The variables Pic1 through Pic6 are pictures. You cannot store another type of data to them. The variables GDB1 through GDB6 are graph databases. You cannot store another type of data to them. You can store any string of characters, functions, instructions, or variable names to the functions Yn, XnT, rn, Un, and Vn directly or through the Y= editor. The validity of the string is determined when the function is evaluated. System Variables The variables below must be real numbers. You may store to them. The TI.82 can update some of them, as the result of a ZOOM, for example, so you may wish to avoid using these variables for nongraphing activities. ¦ Xmin, Xmax, Xscl, @X, XFact, Tstep, UStart, nMin, and other WINDOW variables. ¦ ZXmin, ZXmax, ZXscl, ZTstep, ZUnStart, ZnMin, and other ZOOM MEMORY variables. The variables below are reserved for use by the TI.82. You cannot store to them. ¦ n, v, minX, Gx, a, r, RegEQ, x1, y1, and other statistical result variables. ¦ Q1, Med, Q3. You can store to Un-1 and Vn-1 outside of graphing, but you cannot store to n outside of graphing. A-28 Tables