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Assume that I have two lists like :

list1={1,2,3,4,5}; list2={a,b,c,d,e};

I want to replace some elements from list1 into list2 and make a new list, NewList. For example, I want to replace the elements of list1 from position 1 and 5, with the elements of list2 with the same positions. The result will be :

NewList={1,b,c,d,5};

Is there any way to do that ?!

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4 Answers 4

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Another way, doing it all at once:

Newlist = list2;    
Newlist[[{1,5}]] = list1[[{1,5}]];

Gives

Newlist
   (* {1, b, c, d, 5} *)
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  • $\begingroup$ It's a nice and easy method! Thank you. $\endgroup$
    – Shellp
    Commented Mar 31, 2014 at 11:27
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list1 = {1, 2, 3, 4, 5};
list2 = {a, b, c, d, e};

NewList = list2;
NewList[[1]] = list1[[1]];
NewList[[5]] = list1[[5]];
NewList

{1, b, c, d, 5}

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Newlist = ReplacePart[#2, Rule @@@ Transpose[{#3, #1[[#3]]}]] &[list1, list2, {1, 5}]
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la = {1, 2, 3, 4, 5};

lb = {a, b, c, d, e};

p = {1, 5};

Using SubsetMap (new in 12.0)

SubsetMap[la[[p]] &, lb, p]

{1, b, c, d, 5}

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