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Re: 0.0 is different with 0?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90053] Re: 0.0 is different with 0?
  • From: David Bailey <dave at Remove_Thisdbailey.co.uk>
  • Date: Fri, 27 Jun 2008 06:18:10 -0400 (EDT)
  • References: <g3vkss$kfs$1@smc.vnet.net>

damayi wrote:
> Dear all
> Here is an example to show my question.
> SF[N_Integer, a_Real, fs_Real] :=
>  Table[Sin[(1 + fs)*k*2 Pi/N + a], {k, 0, N - 1}]
> 
> SF[32, 0.1, 0.0] can show the table contents, however, SF[32, 0.1, 0]
> cannot show the result. Why?
> 
> Best Regards
> mayi
> 2008-06-26
> 
Because by using the pattern fs_Real, you have specified a pattern that 
can only match a real number - not the integer 0 - indeed the title of 
your query says it all!

If you want a pattern that can match any number, try fs_?NumericQ

David Bailey
http://www.dbaileyconsultancy.co.uk


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