Texas Instruments TI86 User Manual - Page 407

Appendix 395 Errors 26 through 29 occur during the solving process. Examine a graph of the function or a graph of the variable vs. leftNrt in the SOLVER. If the equation has a solution, change bounds andàor the initial guess. 18 ILLEGAL NEST 19 BOUND 20 GRAPH WINDOW 21 ZOOM 22 LABEL 23 STAT 24 CONVERSION 25 SOLVER 26 SINGULARITY 27 NO SIGN CHNG 28 ITERATIONS 29 BAD GUESS You attempted to use an invalid function in an argument for seq( or a CALC function; for example, der1(der1(x^3,x),x)). You defined an upper bound that is less than the specified lower bound or a lower bound that is greater than the specified upper bound. ♦ One or more window variable values is incompatible with the others for defining the graph screen; for example, you defined xMax < xMin. ♦ Window variables are too small or too large to graph correctly; for example, you attempted to zoom out beyond the calculator's range. A ZOOM operation resulted in an error; you attempted to define ZBOX with a line. In programming, the Goto instruction label is not defined with a Lbl instruction. ♦ You attempted a stat calculation with at least one inappropriate list, such as a list with less than two data points. ♦ At least one element of a frequency list is < 0. ♦ (xMax N xMin)àxScl  63 must be true when plotting a histogram. When converting measurements, the units are incompatible, as in volts to liters. ♦ In the solver editor, the equation does not contain a variable. ♦ You attempted to graph with the cursor positioned on bound. In the solver editor, the equation contains a singularity, which is a point at which the function is not defined. The solver did not detect a sign change. The solver has exceeded the maximum permitted number of iterations. ♦ The initial guess was outside the specified bounds. ♦ The initial guess and several points around the guess are undefined.