Gr_Flags - Texas Instruments TI-89 Developer's Manual

Appendix B: Global Variables — Graphing

gr_flags

Declaration: GR_FLAGS gr_flags
Category: Graphing
Description: Global flags used by the Graph application. Each flag is a separate struct
member. The contents of these flags should not be changed by an app or
ASM but may be accessed for testing the value. The names of the flags
and their purposes are:
BOOL gr_in_progress
BOOL gr_zoom_fit
BOOL gr_cpt_seq_flag
BOOL stat_in_progress
BOOL gr_trace_seq
BOOL de_init_conds
BOOL gr_cpt_de_flag
BOOL new_eqn
BOOL de_error
Inputs: None
None
Outputs:
TI-89 / TI-92 Plus Developer Guide
A graph is currently being plotted. Among
other things, this flag alerts VarRecall to set
the graph reference flag for every user
variable accessed until this flag is reset to
enable the Smart Graph feature to work.
ZoomFit is being executed. Every graph point
is computed to determine the min and max
Window variable values, but while this flag is
set, nothing is plotted.
A graph sequence mode function (u1 – u99)
is being executed.
A statistics calculation is currently being
performed. Among other things, this flag
alerts VarRecall to set the stat reference flag
for every user variable accessed until this flag
is reset to enable the calculator to determine
when the statistics results are no longer valid.
A sequence function is being traced.
A differential equation is being plotted with
initial conditions selected interactively using
the graph cursor.
A graph differential equation mode function
(y1' – y99') is being executed.
The Numeric Solver system variable eqn has
changed. This alerts the solver graph to
regraph.
An error has occurred while computing a
graph differential equation mode function.
(continued)
Not for Distribution
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Beta Version January 26, 2001