Re: how to make a list of rules with 2 other lists composed by different kinds of elements
- To: mathgroup at smc.vnet.net
- Subject: [mg127140] Re: how to make a list of rules with 2 other lists composed by different kinds of elements
- From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
- Date: Mon, 2 Jul 2012 05:26:20 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Dear all,
I want to generate a list composed by rules. That is,
I have two list
First one:
list1=={1, 2, 3}
The elements of this list are Integers.
Map[Head, list1] == {Integer, Integer, Integer}
Second one:
list2== {"file1", "file2", "file3"}
The elements of this list are Strings.
Map[Head, list2] == {String, String, String}
What I want is to have a new list like
list3== {1 -> "file1", 2 -> "file2", 3 -> "file3"}
Map[Head, list3] == {Rule, Rule, Rule}
Yes, of cause I can generate a list of rule manually. But what I have are
two big list of many elements and they are the output of other codes. So,
in real life this would be a part of big program. That is why I want to
generate the rule list automatically from list1 and list2. How could I do
this in a simple way? Thank you for your help.
Best regards,
Joug
Hi, Joug,
Try this:
list1 == {1, 2, 3};
list2 == {"file1", "file2", "file3"};
Thread[list1 -> list2]
{1 -> "file1", 2 -> "file2", 3 -> "file3"}
Or this:
Table[Rule[list1[[i]], list2[[i]]], {i, 1, Length[list1]}]
{1 -> "file1", 2 -> "file2", 3 -> "file3"}
Have fun, Alexei
Alexei BOULBITCH, Dr., habil.
IEE S.A.
ZAE Weiergewan,
11, rue Edmond Reuter,
L-5326 Contern, LUXEMBOURG
Office phone : +352-2454-2566
Office fax: +352-2454-3566
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e-mail: alexei.boulbitch at iee.lu