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Thread and MapThread

  • To: mathgroup at
  • Subject: [mg29868] Thread and MapThread
  • From: "David Park" <djmp at>
  • Date: Sat, 14 Jul 2001 01:36:59 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Dear MathGroup,

Here is a function:

ftest[x_, y_] := {f1[x], f2[y]}

Why does the following work...

MapThread[ftest, {{x1, x2, x3}, {y1, y2, y3}}]
{{f1[x1], f2[y1]}, {f1[x2], f2[y2]}, {f1[x3], f2[y3]}}

...but the following does not work.

Thread[ftest[{x1, x2, x3}, {y1, y2, y3}]]
{f1[{x1, x2, x3}], f2[{y1, y2, y3}]}

David Park
djmp at 

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