
Hi, all

I'm trying to solve an optimization problem with two 
variables, in wich Iuse the following functions(they all are working 
perfectly):

fxx1=function(x){
calc=((2.5/3)*((x/3)^(2.5-1))*exp(-(x/3)^2.5))
return(calc)}

fxx2=function(x){
calc1=((5.3/19.3)*((x/19.3)^(5.3-1))*exp(-(x/19.3)^5.3))
return(calc1)}

fxMixed=function(x){
calc2=(0.12*fxx1(x)+((1-0.12)*fxx2(x)))
return(calc2)}


FxMixed=function(x){
calc3=integrate(fxMixed,0,x)
return(calc3$value)}

RxMixed=function(x){
calc4=(1-FxMixed(x))
return(calc4)}

SUM=function(x){
T1=x[1]
M1=x[2]
n=M1-1
calc5=1:n
for (i in 0:n){
calc5[i]=RxMixed(i*T1)}
sum(calc5)}

V=function(x){
T1=x[1]
M1=x[2]
y=T1*M1
calc6=T1*SUM(x)+0.001*RxMixed(y)+0.00463*FxMixed(y)
return(calc6)}

However, when I try to use the function U, there is an error message and I don't understand what's wrong with my code:

U=function(x){
T1=x[1]
M1=x[2]
y=M1*T1
calc7=integrate(RxMixed,0,y)
return(calc7$value)}

> U(c(2,5))
Error in integrate(RxMixed, 0, y) : 
  evaluation of function gave a result of wrong length



I think that this might happen becouse my fucntion RxMixed is already an previous integration of the function fxMixed. 

Any help will be welcome!

 		 	   		  
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