Texas Instruments TI89 Developer Guide - Page 635
EQU_select, Declaration, Categoryies, Description, Inputs, Outputs, Assumptions, Side Effects
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Appendix A: System Routines - Graphing 593 EQU_select Declaration: BOOL EQU_select (SSHORT cFunc, EQU_SELECT sel) Category(ies): Graphing Description: Turn on/off/toggle function graph selection flag. This controls which functions have a check mark by them in the Y= screen and subsequently are graphed in the Graph screen. This routine uses the current Graph mode setting to determine which type of functions are affected. Inputs: cFunc - Function number to select/deselect (1 . . . 99). Parametric graph mode allows functions yt1 . . . yt99 to be selected by specifying function numbers -1 . . . -99. sel - SELECT_ON to graph function. SELECT_OFF to deselect function from graph. SELECT_TOGGLE to toggle function selection. Outputs: Return TRUE if the graph function exists, otherwise return FALSE. Assumptions: 3D graph mode expects no more than one function to be selected. If you select a 3D function to graph, make sure you deselect all other 3D functions. Side Effects: None Availability: All versions of the TI-89 / TI-92 Plus. TI-89 / TI-92 Plus Differences: None See Also: EQU_setStyle Example: BOOL selectfunc(SSHORT cFunc) { Access_AMS_Global_Variables; BOOL bSel; bSel = EQU_select(cFunc, SELECT_ON); /* select function to graph */ if (gr_active->graph_mode == GR_3D && bSel) /* 3D mode and was func selected? */ { SSHORT n; for (n = 1; n
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