dqstep determines the smallest steps ds from s so that
abs(f(s+ds)-f(s)) equals a pre-specified sensitivity
dqstep(x, f, sens)
a list with components 'label' (of mode character), 'est' (the parameter vector with the initial guess), 'low' (vector with lower bounds), and 'upp' (vector with upper bounds)
the function that is to be minimized over the parameter
vector defined by the list
target sensitivity (i.e. the value of f(s+ds)-f(s))
uses simple quadratic interpolation
returns a vector with the desired step sizes
This function is part of the Bhat exploration tool
E. Georg Luebeck (FHCRC)
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