I'm not sure about if these should be like gaussian.walk or this. The function from metropolis returns function(state,...), and the ... is passed to the rprop and dprop functions. It allows for this to work, but in practice it seems to make code less self contained and more confusing, since you have to suppply arguments to iterate to control the walker. On the other hand this method means one less intermediate function to construct, and the opportunity to adapt without creating a new proposal function.
maximum magnitude of a jump
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