TI-BASIC:Angle
Command Summary
Returns the complex argument of a complex number.
Command Syntax
angle(z)
Menu Location
Press:
- MATH to access the Math menu.
- RIGHT, RIGHT to access the CPX (complex) submenu
- 4 to select angle(, or use arrows.
TI-83/84/+/SE
2 bytes
angle(z) returns the complex argument (also known as the polar angle) of the complex number z. If z is represented as x+iy where x and y are both real, angle(z) returns R►Pθ(x,y) (which is equivalent to tanֿ¹(y/x) if x is nonzero). Also works on a list of complex numbers.
angle(3+4i)
.927295218
R►Pθ(3,4)
.927295218
When writing a complex number z in the form <math>re^{i\theta}</math> (or, equivalently, <math>r(\cos\theta+i\sin\theta)</math>), then <math>\theta</math> is equal to the value of angle(z), suitably reduced so that the result returned is in the interval <math>-\pi<\theta\leq\pi</math>.
The angle( command also works on Matrices, though not in any useful way: angle([A] will return a matrix of the same size as [A], but with all elements 0. If you plan to use this, don't: 0[A] does the same thing, but is smaller and not as questionable (because this behavior is clearly unintentional on TI's part, and may be changed in an OS update).
