Nothing

```
reflect <-
function (x, lower, upper)
{
L = upper - lower
if (x>=lower & x<=upper)
result = x
else
{
if (x<lower)
{
near = lower
far = upper
}
if (x>upper)
{
near = upper
far = lower
}
# compute distance between x and nearest boundary
d = abs (near - x)
# compute number of intervals contained in this distance
n = floor (d/L)
# n odd: subtract remainder from upper boundary
# n even: add remainder to lower boundary
d.tmp = d - n*L
if (x<lower)
result = ifelse ((n%%2)!=0, far-d.tmp, near+d.tmp)
else
result = ifelse ((n%%2)!=0, far+d.tmp, near-d.tmp)
}
return (result)
}
```

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