编码如下，

log((k*r)/y)=c(7)*log(y)+log(c(1))+log(c(2))+((c(7)/c(6))-1)*log(c(1)*(c(3)*k)^(-c(6))+(1-c(1))*(c(4)*l)^(-c(6)))-c(6)*log(c(3))-c(6)*log(k)

log((l*w)/y)=c(7)*log(y)+log(1-c(1))+log(c(2))+((c(7)/c(6))-1)*log(c(1)*(c(3)*k)^(-c(6))+(1-c(1))*(c(4)*l)^(-c(6)))-c(6)*log(c(4))-c(6)*log(l)

log((e*p)/y)=c(7)*log(y)+log(1-c(2))-c(7)*log(c(5))-c(7)*log(e)

log(y)=(-1/c(7))*log(c(2)*(c(1)*(c(3)*k)^(-c(6))+(1-c(1))*(c(4)*l)^(-c(6)))^(c(7)/c(6))+(1-c(2))*(c(5)*e)^(-c(7)))

inst k r y w l e p

PARAM c(1) 0.5 c(2) 0.5 c(3) 1 c(4) 1 c(5) 1 c(6) 1 c(7) 1

求大神指教，运行结果老是出现Near singular matrix，这是怎么回事，能修改吗，不删除变量的情况下