[Date Index] [Thread Index] [Author Index]

Matching with a "Flat" function

• To: mathgroup at smc.vnet.net
• Subject: [mg70857] Matching with a "Flat" function
• From: "Szabolcs" <szhorvat at gmail.com>
• Date: Mon, 30 Oct 2006 05:32:16 -0500 (EST)

Could someone explain this behaviour to me? I'd expect f[_Integer] to
match f[2] even after I set attribute Flat on f.

Szabolcs

In[1]:= MatchQ[f[2],f[_]]

Out[1]= True

In[2]:= MatchQ[f[2],f[_Integer]]

Out[2]= True

In[3]:= SetAttributes[f,Flat]

In[4]:= MatchQ[f[2],f[_]]

Out[4]= True

In[5]:= MatchQ[f[2],f[_Integer]]

Out[5]= False