Nothing

```
plin <- function(q, a, b, s){
## Values of a density that is uniform on [0,1], except on
## intervals given by vectors a (= start points) and b (= endpoints)
## where it is equal to a linear function with slopes s.
if (length(a) == 1){
if (b < a){cat('Interval is not proper!')}} else {
for (i in 2:length(a)){if (b[i-1] > a[i]){cat('Vectors a and b are not proper!')}}}
for (i in 1:length(a)){if (s[i] > 2/(b[i]-a[i])){cat('Not a density for this choice of a, b, s!')}}
y <- q
for (i in 1:length(q)){
for (j in 1:length(a)){
if (q[i] >= a[j] & q[i] < b[j]){y[i] <- q[i] + s[j] / 2 * (q[i]^2 - a[j]^2+(a[j]-q[i])*(a[j]+b[j]))}
}
}
return(y)
}
```

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