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• To: mathgroup at yoda.physics.unc.edu
• Subject: Thread
• From: Nunes <nunes at ysidro.econ.uiuc.edu>
• Date: Mon, 15 Nov 1993 09:16:02 -0600

Does anyone know why does the Thread function doesn't
allow a composed header. For example, the following
works just fine:

  In[1]:= Thread[f[g[a,b],g[c,d]],g]

  Out[1]= g[f[a, c], f[b, d]]

  In[2]:= Head[g[1][a,b]]

  Out[2]= g[1]

  In[3]:= Head[g[1][c,d]]

  Out[3]= g[1]

But now g[1] is not recognized as an header:

  In[4]:= Thread[f[g[1][a,b],g[1][c,d]],g[1]]

  Out[4]= f[g[1][a, b], g[1][c, d]]


		--Luis Nunes