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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
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