This change has been incorporated into the documentation in Release 2010a (R2010a). For previous releases, read below for any additional information:
Many Leap values create sequences that fail to touch on large sub-hyper-rectangles of the unit hypercube, and so fail to be a uniform quasi-random point set.
A known rule for choosing Leap values for Halton sets is to set it to (P-1) where P is a prime number that has not been used to generate one of the dimensions, i.e. for a k-dimensional point set P would be the (k+1)th or greater prime.
So in this 30 dimensional example, a suitable Leap value would be the 31st prime - 1, i.e., 127-1 = 126:
p = haltonset(30,'Skip',1e7,'Leap',126);
X = net(p,1000);
boxplot(X)
