I am working with the R programming language. I am trying to use the following library to optimize an arbitrary function I wrote: https://cran.r-project.org/web/packages/nsga2R/nsga2R.pdf

First I created some data for this example:

```
#load library
library(dplyr)
library(nsga2r)
#create data for this example
# create some data for this example
a1 = rnorm(1000,100,10)
b1 = rnorm(1000,100,5)
c1 = sample.int(1000, 1000, replace = TRUE)
train_data = data.frame(a1,b1,c1)
```

Then, I defined the function for optimization (7 inputs, 4 outputs):

```
#define function
funct_set <- function (x) {
x1 <- x[1]; x2 <- x[2]; x3 <- x[3] ; x4 <- x[4]; x5 <- x[5]; x6 <- x[6]; x[7] <- x[7]
f <- numeric(4)
#bin data according to random criteria
train_data <- train_data %>%
mutate(cat = ifelse(a1 <= x1 & b1 <= x3, "a",
ifelse(a1 <= x2 & b1 <= x4, "b", "c")))
train_data$cat = as.factor(train_data$cat)
#new splits
a_table = train_data %>%
filter(cat == "a") %>%
select(a1, b1, c1, cat)
b_table = train_data %>%
filter(cat == "b") %>%
select(a1, b1, c1, cat)
c_table = train_data %>%
filter(cat == "c") %>%
select(a1, b1, c1, cat)
#calculate quantile ("quant") for each bin
table_a = data.frame(a_table%>% group_by(cat) %>%
mutate(quant = ifelse(c1 > x[5],1,0 )))
table_b = data.frame(b_table%>% group_by(cat) %>%
mutate(quant = ifelse(c1 > x[6],1,0 )))
table_c = data.frame(c_table%>% group_by(cat) %>%
mutate(quant = ifelse(c1 > x[7],1,0 )))
f[1] = mean(table_a$quant)
f[2] = mean(table_b$quant)
f[3] = mean(table_c$quant)
#group all tables
final_table = rbind(table_a, table_b, table_c)
# calculate the total mean : this is what needs to be optimized
f[4] = mean(final_table$quant)
return (f);
}
```

Then, I ran the optimization code:

```
#optimization
results <- nsga2R(fn=funct_set, varNo=7, objDim=4, lowerBounds=c(80,80,80,80, 100, 200, 300), upperBounds=c(120,120,120,120,200,300,400),
popSize=50, tourSize=2, generations=50, cprob=0.9, XoverDistIdx=20, mprob=0.1,MuDistIdx=3)
```

But this returns the following error:

```
Error in if (all(xi <= xj) && any(xi < xj)) { :
missing value where TRUE/FALSE needed
```

Does anyone know if the error being produced is because of the way I have defined the function/data for this problem? Or is there another reason why this error is being produced?

Thanks