Appendix A: System Routines — Graphing
593
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
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 <= 99; n += 1) /* deselect all other functions */
{
if (n != cFunc) /* except one just selected */
EQU_select(n, SELECT_OFF);
}
}
return bSel;
}
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