%计算杆长函数
function [BarLength]=BarsLength(x,y,ele)
BarLength=zeros(size(ele,1),1);
for iEle =1: size(ele,1)
BarLength(iEle,1)=((x(ele(iEle,3))-x(ele(iEle,2)))^2+(y(ele(iEle,3))-...
y(ele(iEle,2)))^2)^0.5;
end