偏心
弾力半径の算出x方向 : r e x = ∑ l x ( y − s y ) 2 + ∑ l y ( x − s x ) 2 ∑ l x {\displaystyle r_{ex}={\sqrt {\frac {\sum {l_{x}(y-s_{y})^{2}}+\sum {l_{y}(x-s_{x})^{2}}}{\sum {l_{x}}}}}} y方向 : r e y = ∑ l y ( x − s x ) 2 + ∑ l x ( y − s y ) 2 ∑ l y {\displaystyle r_{ey}={\sqrt {\frac {\sum {l_{y}(x-s_{x})^{2}}+\sum {l_{x}(y-s_{y})^{2}}}{\sum {l_{y}}}}}}
偏心率の算出x方向 : R e x = e y r e x {\displaystyle R_{ex}={\frac {e_{y}}{r_{ex}}}} y方向 : R e y = e x r e y {\displaystyle R_{ey}={\frac {e_{x}}{r_{ey}}}}