Function

vDSP_polarD

Converts double-precision rectangular coordinates to polar coordinates, using the specified stride.

Parameters

__A

Double-precision real input vector.

__IA

Stride for A, must be even.

__C

Double-precision output vector.

__IC

Stride for C, must be even.

__N

Number of ordered pairs processed.

Discussion

This performs the following operation:

Converts rectangular coordinates to polar coordinates. Vector A defines Cartesian (x, y) pairs. The function writes polar (rho, theta) pairs, where rho is the radius and theta is the angle in the range [-pi, pi] to vector C. N specifies the number of coordinate pairs in A and C.

Coordinate pairs are adjacent elements in the array, regardless of stride; stride is the distance from one coordinate pair to the next.

The following code shows how to convert a single pair of rectangular coordinates to their polar equivalent.

On return, radius is 7.07, and angle is 45.

This function performs the inverse operation of vDSP_rect, which converts polar to rectangular coordinates.

Single-Vector Polar-Rectangular Conversion

vDSP_polar

Converts single-precision rectangular coordinates to polar coordinates, using the specified stride.

vDSP_rect

Converts single-precision polar coordinates to rectangular coordinates, using the specified stride.

vDSP_rectD

Converts double-precision polar coordinates to rectangular coordinates, using the specified stride.