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BASIS Polynomial chaos basis constrauction.
[P,w,lb,ub] = BASIS(K,s,ext,lb,ub) return basis polynomials, weights & bounds.
Warning: might require a second orthogonalization for more precision
Options: Default values for ext is '' (no normalization). s=1 (truncated) normal distribution with parameters mu, sig over range (lb,ub) (default: (-inf,inf)) s=2 uniform distribution over range (lb,ub) (default: (-1,1)) s=3 Chebyshev distribution over range (lb,ub) (default: (-1,1))