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Q: Thread behaviour

  • To: mathgroup at
  • Subject: [mg57933] Q: Thread behaviour
  • From: Dick Barends <dick.barends at>
  • Date: Mon, 13 Jun 2005 05:50:50 -0400 (EDT)
  • Sender: owner-wri-mathgroup at


k[x_,y_] = x^2+y^2
Thread[k[a+b,c d],Plus]
gives: (a+b)^2+c^2 d^2
I would expect: a^2 + (c d)^2 + b^2 + (c d)^2 (See below)

When I use:
Thread[m[a+b, c d],Plus]
gives: m[a, c d] + m[b, c d]
This is what should happen.

What gives "m" a different solution than "k"????

I hoop some of you will answer:-)


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