ListCorrelate and functions on it with an extra condition

• To: mathgroup at smc.vnet.net
• Subject: [mg86322] ListCorrelate and functions on it with an extra condition
• From: P_ter <peter_van_summeren at yahoo.co.uk>
• Date: Sat, 8 Mar 2008 05:43:07 -0500 (EST)

```Hello,
I have a question about the function p in the following:
ListCorrelate[{{1, 1}, {1, 1}}, {{a1, b1, c1, d1}, {a2, b2, c2,d2}}, {1, -1}, {}, Times, p]
The outcome is:
{{p[p[a1, b1], p[a2, b2]], p[p[b1, c1], p[b2, c2]],p[p[c1, d1], p[c2, d2]]}}
I have the following problem with p[p[a1, b1], p[a2, b2]].
If a1!=b1 then the "outer"p should give False,
if a1==b1 and a2==b2 then the outer p should give True,
if a1==b1 and a2!=b2 but Length[a2] < Length[b2], the outer p should give True,
for the rest the outer p should give False.
Any idea?
with friendly greetings,
P_ter

```

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