Create an array using indexes/values of another array C# [duplicate]

Question

In MATLAB its simple:

 array1 = [5,6,7,8];
 array2 = array1(2:3);

OUTPUT:

  array2 = [6,7]

How do I do this in CSharp?

Have you tried anything? If you want C# you should so some C# attempts — Gilad Green
– Gilad Green, Commented Oct 16, 2017 at 9:32
In MATLAB, does changing the values in array2 also change the values in the array it was created from? — Matthew Watson
– Matthew Watson, Commented Oct 16, 2017 at 9:35
Might have been a bad example. What about array2 = array1(132:279) I dont want to have to write them all individually — lsama
– lsama, Commented Oct 16, 2017 at 10:31

H. Hakvoort · Accepted Answer · 2017-10-16 11:01:15Z

2

Arrays in c# start with index 0, so doing this will give you the same output as your example.

array1 = [5,6,7,8];
array2 = new Array[array1[1],array1[2]]

OUTPUT

array2 = [6,7]

EDIT because of this comment: Might have been a bad example. What about array2 = array1(132:279) I dont want to have to write them all individually – lsama

An easy way to do it is with a method like this.

array1 = [5,6,7,8];
array2 = new Array();

private void getThisIndexes(int firstIndex, int lastIndex){
  for(int i=0; i < array1.length; i++){
    if(i < firstIndex&& i >= lastIndex){
      array2.add(array1[i]);
    }
  }
}

edited Oct 16, 2017 at 11:01

answered Oct 16, 2017 at 9:36

H. Hakvoort

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1 Comment

lsama Over a year ago

Might have been a bad example. What about array2 = array1(132:279) I dont want to have to write them all individually

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