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Property Value
Hex Value $78
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  • FR: Polaire

Polar

Overview

Sets polar graphing mode.

Availability: Token only available from within the Basic editor.

Syntax

Polar

Location

mode, Polar

Description

The Polar command enables the polar graphing mode.

Unlike the previous modes, polar mode doesn't use the more common (x,y) coordinates. Instead, the coordinates (r,θ) are used, where θ is the counterclockwise angle made with the positive x-axis, and r is the distance away from the origin (the point (0,0)). Although it's possible to translate from one system to the other, polar coordinates are more useful for some expressions (and, of course, less useful for others).

In particular, they're very good at graphing anything circle-related. The equation for a circle in polar mode is just r=1 (or any other number, for a circle of different radius).

Like in parametric mode, the parameter θ uses the window variables θmin, θmax, and θstep to determine which points are graphed. A common situation is θmin=0, θmax=2π: in Radian mode, this corresponds to going all the way around the circle. Of course, you could use Degree mode and set θmax to be 360, but this is uncommon in mathematics.

Advanced Uses

The window variables that apply to polar mode are:

  • θmin — Determines the minimum θ-value graphed for equations.
  • θmax — Determines the maximum θ-value graphed for equations.
  • θstep — Determines the difference between consecutive θ-values.
  • Xmin — Determines the minimum X-value shown on the screen.
  • Xmax — Determines the maximum X-value shown on the screen.
  • Xscl — Determines the horizontal space between marks on the X-axis in AxesOn mode or dots in GridOn mode.
  • Ymin — Determines the minimum Y-value shown on the screen.
  • Ymax — Determines the maximum Y-value shown on the screen.
  • Yscl — Determines the vertical space between marks on the Y-axis in AxesOn mode or dots in GridOn mode.

Source: parts of this page were written by the following TI|BD contributors: burr, DarkerLine, GoVegan.

History

Calculator OS Version Description
TI-82 1.0 Added
Authors: Adrien Bertrand