Date: Jan 26, 2013 1:37 AM
Author: Themis Matsoukas
Subject: Question about Thread & Total

I was wondering why the error message in the example below:

Thread[Total[{{1}, {2, 3}}]]

Total::tllen: Lists of unequal length in {{1},{2,3}} cannot be added. >>

{1, 5}

On the other hand, the construction below gives the same answer without complaints:

Thread[h[{{1}, {2, 3}}]] /. h -> Total

{1, 5}