The default
[1..5]
gives this
[1,2,3,4,5]
and can also be done with the range function. Is it possible to change the step size between the points, so that I could get something like the following instead?
[1,1.5,2,2.5,3,3.5,4,4.5,5]
[1,1.5..5]
You have to be careful with floating point arithmetic. It can't represent 1.1 precisely, so if you try
Prelude> [0,0.1 .. 1]
[0.0,0.1,0.2,0.30000000000000004,0.4,0.5,0.6,0.7,0.7999999999999999,0.8999999999999999,0.9999999999999999]
Best way is more like:
Prelude> map (/10) [0..10]
[0.0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0]
Actually, [1..5]
is syntactic sugar for
enumFromTo 1 5
and [1,1.5..5]
for
enumFromThenTo 1 1.5 5
For more information, see http://en.wikibooks.org/wiki/Haskell/Syntactic_sugar
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