[Haskell-beginners] Performance of Idiomatic lazy Haskell

[Stephen Tetley]

On 31 January 2010 18:50, Daniel Fischer <daniel.is.fischer at web.de> wrote:


>
> Yes. Returning to that,
>
> a) for tasks where it's appropriate/sufficiently natural, hand-coded loops
> are idiomatic, too.
>

Indeed - originally I looked at Markus's code and only saw that an
unfoldr would be a natural implementation for the Leibniz generating
function. I overlooked the episilon used to control the accuracy which
pollutes the unfold and makes it no clearer (too much haste / speed on
my part).



>> also the answers are divergent too...
>
> In how far?

On my machine, they diverged at the eighth decimal place -

Leibniz4 3.1415926526069526
Leibniz1 3.1415926445727678


Best wishes

Stephen