[R] Error in 1/ue : non-numeric argument to binary operator.

[beiyu]

hi, I have a problem. The R shows that 
Error in 1/ue : non-numeric argument to binary operator.

Here is the code:


#  simulation of tempered stable processes by compound Poisson approximation

tsp<-function(n,e,a,c,lema){


x<-numeric(n)


for (i in 1:n){

repeat{


w<-runif(1)
v<-runif(1)
x<-e*(w^(-1/a))





fex<-function(x1){ if (x1>=e) {a1<-a*(e^(-a))/(x^a-1)}}

vex<-function(x2){c*exp(-lema*x2)/(x2^(a+1))}

ue<-integrate(vex,e,Inf)

aa<-(1/ue)*c


pex<-function(x3){aa*exp(-lema*x3)/(x3^(a+1))}





if (x>=e) {pex(x)}




T<-fex(x)*(e^(-a))*(exp(-lema*e))/(pex(x)*a*ue)

if(V*T<=1)  break

if (ue<=2) break

}

x

}
}

tsp(10,0.01,1.5,1,10)


Could any one help me? Thx~

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