[Haskell-beginners] How would you write...
Daniel Fischer
daniel.is.fischer at googlemail.com
Tue Apr 22 08:39:05 UTC 2014
On Tuesday 22 April 2014, 03:00:20, John M. Dlugosz wrote:
> chain1 = [ translate x y $ color red $ Circle r | (x,y,r) <- pappus 100
> [1..10] ]
>
> The above is not right, as the comprehension syntax doesn't see the input
> range buried in an argument.
>
> What's the right way to express
>
> pap1 = translate x y $ color red $ Circle r
> where (x,y,r) = pappus 100 1
>
> where 1 is [1..10] and I get a list of results?
> (pap1 does work as expected)
>
> (1) how can the list comprehension syntax manage it,
If I guess your intentions right:
chain1 = [ translate x y $ color red $ Circle r | (x,y,z) <- map (pappus 100)
[1 .. 10]]
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