cos16()

LIB8STATIC int16_t cos16

(

uint16_t

theta

)

Fast 16-bit approximation of cos(x).

This approximation never varies more than 0.69% from the floating point value you'd get by doing

float s = cos(x) * 32767.0;

Parameters

theta

input angle from 0-65535

Returns

cos of theta, value between -32767 to 32767.

Examples

XYMatrix.ino.

Definition at line 148 of file trig8.h.

{ return sin16(theta + 16384); }

References LIB8STATIC, and sin16.

Referenced by loop(), and fl::Transform16::transform().

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