Re: Threading 'Append'
- To: mathgroup at smc.vnet.net
- Subject: [mg62821] Re: Threading 'Append'
- From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
- Date: Tue, 6 Dec 2005 00:03:17 -0500 (EST)
- Organization: Uni Leipzig
- References: <dn226p$ksm$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
Mathematica evaluate an expression from the inner
parts to the outer
parts. Since Append[{{1,2},{3,4},{5,6}},{a,b,c}]
is evaluated to
{{1,2},{3,4},{5,6},{a,b,c}} the later evaluation
of Thread[] does
not find a Append that it can thread ..
Thread[Hold[Append][{{1, 2}, {3, 4}, {5, 6}}, {a,
b, c}]] // ReleaseHold
or
MapThread[Append, {{{1, 2}, {3, 4}, {5, 6}}, {a,
b, c}}]
may help.
Regards
Jens
"J Siehler" <jsiehler at gmail.com> schrieb im
Newsbeitrag news:dn226p$ksm$1 at smc.vnet.net...
| If I run
|
| Thread[Append[{{1,2},{3,4},{5,6}},{a,b,c}]]
|
| I would expect to get
|
| {{1,2,a},{3,4,b},{5,6,c}}
|
| but in fact I get an 'Objects of unequal length'
error.
|
| On the other hand,
|
| Thread[foo[{{1,2},{3,4},{5,6}},{a,b,c}]]
| %/.foo->Append
|
| gives what I wanted. Can someone explain what's
going on?
|