On Jan 28, 2008 12:45 AM, [EMAIL PROTECTED] wrote:
It seems strange that you need the types e and e' (perhaps this is a
quirk or a bug of GHC 6.8). With GHC 6.6, I have derived the following
instance (Floating f, MetricSpace e f, HFoldr ApplyDistSum Float l1 f,
HZip (HCons e l)
After some fooling around, I came up with something I think makes
sense. Let me know if this is the right/wrong thing. It seems to
work for the examples I've tried so far.
instance (Floating f, MetricSpace e f
,MetricSpace e' f, HZip l l (HCons (e', e') l')
,HFoldr
On Sat, Jan 26, 2008 at 1:59 AM, [EMAIL PROTECTED] wrote:
[snip useful explanation of error}
Here's a
bit elaborated example:
[...]
Thanks! this works, and I understand why it didn't before.
The example I posted was a stepping stone toward a definition of
distance using hFoldr and hZip.
On Sat, Jan 26, 2008 at 11:03 AM, Denis Bueno [EMAIL PROTECTED] wrote:
Have I made some sort of simple error, or am I going about this the
wrong way altogether?
After some fooling around, I came up with something I think makes
sense. Let me know if this is the right/wrong thing. It seems to
