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List manipulation question

• To: mathgroup at smc.vnet.net
• Subject: [mg67163] List manipulation question
• From: "LectorZ" <lectorz at mail.ru>
• Date: Sun, 11 Jun 2006 02:17:33 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Dear experts,

I need to calculate distances between the elements of the following
list:

list={3700, 3800, 3900, 3950, 4000, 4050, 4100, 4150, 4200, 4250, 4300,
4350,
4400, 4450, 4500, 4550, 4600, 4650}

with the following logic:

a) If it is the first element, then take the simple difference to the
next (i.e. 3800 - 3700)
b) If it is the last element, then take the simple difference to the
second last (i.e. 4650 -4600)
c) the difference for all elements in between shoud be calculated as
(next - last)/2 (i.e. (3900 - 3700)/2)

This list should come out as a result:

result={100,100,75,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50}

Thanks a lot for your help

LZ

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