Henning Thielemann wrote:

I think the verb is 'convolve'.

Possibly.

If ks is infinite it will not work.

Indeed.

If the correlate function could be altered to use Prelude list functions only, I would think the above code works quite well with stream fusion too. (Presumably you could do this using "inits" or something?)

You mean 'tails' ? Would be rather straight-forward.

Hmm... Off the top of my head, I'm not sure which would be the correct one... Either way, I haven't tried it, but it looks like it shouldn't be hard.

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