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atan2d

Four-quadrant inverse tangent in degrees

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Syntax

D = atan2d(Y,X)

Description

D = atan2d(Y,X) returns the four-quadrant inverse tangent (tan-1) of Y and X, which must be real. The result, D, is expressed in degrees.

example

Examples

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Open Live Script
x = [1 0 -1 0];
y = [0 1 0 -1];
d = atan2d(y,x)
d = 1×4

     0    90   180   -90

Input Arguments

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y-coordinates, specified as a scalar, vector, matrix, multidimensional array, table, or timetable. Inputs Y and X must either be the same size or have sizes that are compatible (for example, Y is an M-by-N matrix and X is a scalar or 1-by-N row vector). For more information, see Compatible Array Sizes for Basic Operations.

Data Types: single | double | table | timetable

x-coordinates, specified as a scalar, vector, matrix, multidimensional array, table, or timetable. Inputs Y and X must either be the same size or have sizes that are compatible (for example, Y is an M-by-N matrix and X is a scalar or 1-by-N row vector). For more information, see Compatible Array Sizes for Basic Operations.

Data Types: single | double | table | timetable

More About

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Four-Quadrant Inverse Tangent

The four-quadrant inverse tangent, atan2d(Y,X), returns values in the closed interval [-180,180] based on the values of Y and X as shown in the graphic.

Figure shows the unit circle with X along the horizontal axis and Y along the vertical axis. Angles are labeled in degrees.

In contrast, atand(Y/X) returns results that are limited to the interval [-90,90], shown on the right side of the diagram.

Extended Capabilities

GPU Code Generation
Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.

Version History

Introduced in R2012b

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See Also

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