Evaluates the double exponential trawl function
trawl_DExp(x, w, lambda1, lambda2)the argument at which the double exponential trawl function will be evaluated
parameter in the double exponential trawl
the parameter \(\lambda_1\) in the double exponential trawl
the parameter \(\lambda_2\) in the double exponential trawl
The double exponential trawl function evaluated at x
The trawl function is parametrised by parameters \(0\leq w\leq 1\) and \(\lambda_1, \lambda_2 > 0\) as follows: $$g(x) = w e^{\lambda_1 x}+(1-w) e^{\lambda_2 xz}, \mbox{ for } x \le 0.$$