Edit an array from another with different length C#

Question

I need help with this code which doesn't work...

I want to change items from Array1, itemps position depending on Array2 items, where Array1 = Array0 and Array0 values are always changing.

Here is what I tried:

float[] Array0 = {1.524,2.345,3.12,4.55,5.345};
float[] Array1 = Array0;
int[] Array2 = {2,1,3};

foreach (int item in Array2)
    if(item!=0)
        Array1[item]=0;

Output :

Array1 = {1.524,0,0,0,5.345}

Do you have any solution ?

Arrays are reference types. So when you do float[] Array1 = Array2 you get a pointer to the same array in memory. So there is just 1 array with 2 pointers to it. Looks like you want Array1 to be a copy of Array0. Try float[] Array1 = Array0.ToArray(); — user10608418
– user10608418, Commented May 21, 2020 at 17:19
@Knoop I'd prefer float[] Array1 = (float[])Array0.Clone(); myself. — D Stanley
– D Stanley, Commented May 21, 2020 at 19:08

Soleil · Accepted Answer · 2020-06-06 18:01:32Z

1

As mentionned in comments, you need to make a copy of array0 into array1 with Clone():

var array0 = new []{ 1.524, 2.345, 3.12, 4.55, 5.345 };
var array1 = (double[])array0.Clone();
int[] array2 = { 2, 1, 3 };

//change array0
array0[2] += 5;
array0[3] += 5;
array0[4] += 5;

foreach (var idx in array2.Where(idx => Math.Abs(array0[idx] - array1[idx]) > 1e-6))
    array1[idx] = 0;

Console.WriteLine(string.Join(" ", array1));

Result:

1.524 2.345 0 0 5.345

answered Jun 6, 2020 at 18:01

Soleil

6,8527 gold badges47 silver badges73 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Edit an array from another with different length C#

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related