ZTarnsform[Sin[4 n],n,z] OK, but ZTransform[Sin[5 n],n,z,] hangs?

*To*: mathgroup at smc.vnet.net*Subject*: [mg56772] ZTarnsform[Sin[4 n],n,z] OK, but ZTransform[Sin[5 n],n,z,] hangs?*From*: "steve" <nma124 at hotmail.com>*Date*: Thu, 5 May 2005 06:03:47 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Hello; This is Mathematica 5.1 on windows. This is a strange one. When I start Mathematica and type ZTarnsform[Sin[4 n],n,z] Then I get the answer. but if replace '4' by '5' above, I see Mathematica starts to consume huge amount of memory untill the PC hangs running out of virtual RAM. ZTarnsform[Sin[5 n],n,z] <---- hangs ZTarnsform[Sin[4 n],n,z] <---- ok any one has any idea what is going on? is this some subtle mathemtical thing I am overlooking that is causing this? what is so special about '5' here? thanks, Steve

**Follow-Ups**:**Re: ZTarnsform[Sin[4 n],n,z] OK, but ZTransform[Sin[5 n],n,z,] hangs?***From:*Chris Chiasson <chris.chiasson@gmail.com>