-- Best regards, Xiaojun Liu @ CAU [Sent with Sparrow (http://www.sparrowmailapp.com)]
在 2011年6月7日星期二，上午2:18，Ralf Hemmecke 写道： > 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] (mailto:[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 Oh, thanks ! > > > > > -- > You received this message because you are subscribed to the Google Groups > "FriCAS - computer algebra system" group. > To post to this group, send email to [email protected] > (mailto:[email protected]). > To unsubscribe from this group, send email to > [email protected] > (mailto:[email protected]). > For more options, visit this group at > http://groups.google.com/group/fricas-devel?hl=en. -- You received this message because you are subscribed to the Google Groups "FriCAS - computer algebra system" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/fricas-devel?hl=en.
