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First nonzero in list

• To: mathgroup at smc.vnet.net
• Subject: [mg110827] First nonzero in list
• From: "S. B. Gray" <stevebg at ROADRUNNER.COM>
• Date: Thu, 8 Jul 2010 03:13:13 -0400 (EDT)
• Reply-to: stevebg at ROADRUNNER.COM

I have lists such as

th = {227, 342, 527, 0, 670, 730, 703, 0, 0, 649, 687, 614, 570, 501,
   462, 402, 325, 254, 189, 99, 81, 36, 9, 8, 3, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}

and I want to find the position of the last nonzero element (e.g. 3 at 
position 25). Trivial, but some poking around did not reveal a neat way.

Anyone? Thank you.

Steve Gray

• Follow-Ups:
  • Re: First nonzero in list
    • From: Leonid Shifrin <lshifr@gmail.com>