Texas Instruments TI-89 User Manual - Page 853

PassErr CATALOG PassErr See ClrErr program listing example. Passes an error to the next level. If "errornum" is zero, PassErr does not do anything. The Else clause in the program should use ClrErr or PassErr. If the error is to be processed or ignored, use ClrErr. If what to do with the error is not known, use PassErr to send it to the next error handler. (See also ClrErr.) Pause CATALOG Pause [expression] Suspends program execution. If you include expression, displays expression on the Program I/O screen. expression can include conversion operations such as 4DD and 4Rect. You can also use the 4 operator to perform unit and number base conversions. If the result of expression is too big to fit on a single screen, you can use the cursor pad to scroll the display. Program execution resumes when you press ¸. Program segment: © :ClrIO :DelVar temp :1"temp[1] :1"temp[2] :Disp temp[2] :¦ Guess the Pattern :For i,3,20 : temp[iì2]+temp[iì1]"temp[i] : Disp temp[i] : Disp temp,"Can you guess the next","number?" : Pause :EndFor © PlotsOff CATALOG PlotsOff [1] [, 2] [, 3] ... [, 9] PlotsOff 1,2,5 ¸ Done Turns off the specified plots for graphing. When PlotsOff ¸ Done in 2-graph mode, only affects the active graph. If no parameters, then turns off all plots. PlotsOn CATALOG PlotsOn [1] [, 2] [, 3] ... [, 9] PlotsOn 2,4,5 ¸ Done Turns on the specified plots for graphing. When in PlotsOn ¸ Done 2-graph mode, only affects the active graph. If you do not include any arguments, turns on all plots. 4Polar MATH/Matrix/Vector ops menu vector 4Polar Displays vector in polar form [r q]. The vector must be of dimension 2 and can be a row or a column. Note: 4Polar is a display-format instruction, not a conversion function. You can use it only at the end of an entry line, and it does not update ans. Note: See also 4Rect. [1,3.] 4Polar ¸ [x,y] 4Polar ¸ Appendix A: Functions and Instructions 853