internal_lsq_sums_t Struct Reference

Accumulated least-squares sums driving the calibration solve. More...

Data Fields
float	Sx
	Sum of raw x.
float	Sy
	Sum of raw y.
float	Sxx
	Sum of raw x^2.
float	Syy
	Sum of raw y^2.
float	Sxy
	Sum of raw x*y.
float	Su
	Sum of screen x.
float	Sv
	Sum of screen y.
float	Sxu
	Sum of raw x * screen x.
float	Syu
	Sum of raw y * screen x.
float	Sxv
	Sum of raw x * screen y.
float	Syv
	Sum of raw y * screen y.

Detailed Description

Accumulated least-squares sums driving the calibration solve.

Holds the 11 running sums needed to assemble the 3x3 normal-equation matrix and both right-hand sides for the weighted-least-squares affine fit (Fang & Chang 2007). Bundling them keeps the ra8_touch_cal_compute body compact while preserving bit-exact math.

Definition at line 324 of file ra8_touch_cal.c.

Field Documentation

Su

float internal_lsq_sums_t::Su

Sum of screen x.

Definition at line 330 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Sv

float internal_lsq_sums_t::Sv

Sum of screen y.

Definition at line 331 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Sx

float internal_lsq_sums_t::Sx

Sum of raw x.

Definition at line 325 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Sxu

float internal_lsq_sums_t::Sxu

Sum of raw x * screen x.

Definition at line 332 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Sxv

float internal_lsq_sums_t::Sxv

Sum of raw x * screen y.

Definition at line 334 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Sxx

float internal_lsq_sums_t::Sxx

Sum of raw x^2.

Definition at line 327 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Sxy

float internal_lsq_sums_t::Sxy

Sum of raw x*y.

Definition at line 329 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Sy

float internal_lsq_sums_t::Sy

Sum of raw y.

Definition at line 326 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Syu

float internal_lsq_sums_t::Syu

Sum of raw y * screen x.

Definition at line 333 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Syv

float internal_lsq_sums_t::Syv

Sum of raw y * screen y.

Definition at line 335 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

Syy

float internal_lsq_sums_t::Syy

Sum of raw y^2.

Definition at line 328 of file ra8_touch_cal.c.

Referenced by internal_accumulate_sums(), and ra8_touch_cal_compute().

---

The documentation for this struct was generated from the following file:

• libs/ra8_touch_cal/src/ra8_touch_cal.c