Texas Instruments TI-89 Developer's Guide

766
Appendix A: System Routines — Math
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
push_atan
Declaration:
void
push_atan
(EStackIndex
k
)
Category(ies):
Math
Description:
Pushes onto the estack the internally-simplified principal branch of the
inverse tangent of the expression indexed by
k,
measured in radians. Thus
the real part of the result is in the range [
Lp
/2,
p
/2].
When
k
indexes a square numeric matrix, pushes the Float matrix atan
computed via
atan
(eigenvalues(matrix)).
Inputs:
k
— Indexes the top tag of an internally-simplified algebraic expression,
comparison, or aggregate thereof.
Outputs:
None
Assumptions:
None
Side Effects:
None
Availability:
On AMS 2.02 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: push_asin, push_acos, push_phase
Example:
push_quantum_as_nonnegative_int(1u); /* Pushes tagged integer 1 */
push_atan (top_estack); /* Pushes symbolic or Float pi/4 */

Texas Instruments TI-89 Specifications

General

Display size (HxV)	100 x 160 mm
Memory type	639K FLASH ROM, 188K bytes RAM
Compatible operating systems	Operating System 2.09
Battery type	AAA