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Re: Pattern Syntax for Alternate Heads with Default Value
 To: mathgroup at smc.vnet.net
 Subject: [mg125874] Re: Pattern Syntax for Alternate Heads with Default Value
 From: Bill Rowe <readnews at sbcglobal.net>
 Date: Thu, 5 Apr 2012 05:55:29 0400 (EDT)
 Deliveredto: lmathgroup@mailarchive0.wolfram.com
On 4/4/12 at 4:27 AM, benp84 at gmail.com (Ben) wrote:
>I'm trying to build a unary function which accepts only arguments
>with two possible heads and has a default value. That is, something
>like the following, except that this doesn't work. Anyone know how
>to do this correctly?
>f[(x_Real  x_Integer) : 2.5] := x^2; where f[3] = 9 and f[1.5] =
>2.25 and f[] = 6.25
In[16]:= f[x_?(# \[Element] Reals &)] := x^2
f[x_] := 6.25
In[19]:= Clear[y]; f[y]
Out[19]= 6.25
In[20]:= f[.8]
Out[20]= 0.64
No need to test for integers since reals include integers.
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