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MathGroup Archive 2007

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Re: Quaternions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78200] Re: [mg78186] Quaternions
  • From: Carl Woll <carlw at wolfram.com>
  • Date: Mon, 25 Jun 2007 07:09:19 -0400 (EDT)
  • References: <200706240949.FAA27504@smc.vnet.net>

Bruce Colletti wrote:

>Re Mathematica 6.0 under WinXP.
>
>The code below works as planned, except that a red marker appears between the final ) and ], announcing that more input is expected.  I'm presuming that in this case, the marker can be ignored, but want to doublecheck with others.
>
>Thankx.
>
>Bruce 
>
>
>Needs["Quaternions`"];
>w={3,4,5};
>u=w/Norm@w;
>Quaternion[Cos[Pi/4],Sequence@@(u Sin[Pi/4])]
>
>  
>
The syntax checking code can only do syntax checking without evaluation. 
In this case, before evaluating the arguments, it appears that 
Quaternion only has 2 arguments, so that syntax checker complains. 
Another similar example is

Binomial[Sequence @@ {4,2}]

Carl Woll
Wolfram Research


  • References:
    • Quaternions
      • From: Bruce Colletti <vze269bv@verizon.net>
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