If I look at https://github.com/hemmecke/fricas-svn/blob/master/src/algebra/stream.spad.pamphlet#L552 I read...
"A stream is an implementation of an infinite sequence ..." The documentation clearly doesn't match the implementation. Ralf On 06/06/2011 08:05 PM, Martin Rubey wrote:
Xiaojun Liu<[email protected]> writes:Hi, I have two Stream of integers, called s1 and s2. I want to add their corresponding elements to form a new stream called s. I use map(f,x,y) to do this, but the result is unexpected if s1 is actually a finite stream, i.e. (1) -> s1 := [i for i in 1..3] :: Stream INT (1) [1,2,3] Type: Stream(Integer) (2) -> s2 := [j for j in 1..] :: Stream INT (2) [1,2,3,4,5,6,7,8,9,10,...] Type: Stream(Integer) (3) -> map(+, s1, s2) (3) [2,4,6] Type: Stream(Integer) But I want the result : [2,4,6,4,5,6,7,8,9,10,...]. Is there any simple way to do this? Do I have to append s1 to a infinite stream by letting the rest elements all be 0 manually?I think that's the way to go. It's not that bad: [i+j for i in concat(s1, repeating [0]) for j in s2] Martin
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