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?

PS: In the beginning I thought it was a bug. But after checking the description 
of 
map(f,x,y), it became quite understandable. As it is impossible to determine
what the rest elements should be if stream x has only finite many elements. 

Thanks in advance!

-- 
Best Regards,
Xiaojun Liu @ CAU
Sent with Sparrow (http://www.sparrowmailapp.com)

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