func (m *matrix3x3) setCol(col int, p Point) *matrix3x3 {
	m[0][col] = p.X
	m[1][col] = p.Y
	m[2][col] = p.Z
	return m
}
setCol sets the specified column to the value in the given Point.
package s2
import (
	"fmt"
	"github.com/golang/geo/r3"
)
type matrix3x3 [3][3]float64
func (m *matrix3x3) col(col int) Point {
	return Point{r3.Vector{m[0][col], m[1][col], m[2][col]}}
}
func (m *matrix3x3) row(row int) Point {
	return Point{r3.Vector{m[row][0], m[row][1], m[row][2]}}
}