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Question by Der_Kevin · Nov 14, 2016 at 01:25 PM · arraylistarrays

only keep every 10th entry in an array?

hey! i have this huge list of arrays:

alt text

in my

 public Vector3[]    paths;  

but i wanna kick out some of them. so that i keep Element 0 , 10 , 20 and so on. how can i do this?

vec3.jpg (157.7 kB)
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Answer by ESchrauwen · Nov 14, 2016 at 02:24 PM

Iterate over your list with a for-loop. Use the modulus operator.

With "i" as your current index, "i % 10" will be 0 for each 10th item.

https://msdn.microsoft.com/en-us/library/0w4e0fzs.aspx

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avatar image Der_Kevin · Nov 14, 2016 at 03:28 PM 0
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 optimizedpoints = new Vector3[points.Length%10];
 
         int j = 0;
 
         for (int i = 0; i < points.Length; i%=10) {
             optimizedpoints[j] = points[i];
             j++;
         }

seams to be wrong somehow? do you know why?

avatar image ESchrauwen Der_Kevin · Nov 14, 2016 at 04:13 PM 0
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 newPoints = new List<Vector3>();
  
 for (int i = 0; i < points.Length; ++i) {
 
         if( i % 10 == 0 )
                 optimizedpoints.Add( points[i] );
 
 
 }
 
 optimizedPoints = newPoints.ToArray();


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Answer by skillbow · Nov 14, 2016 at 01:42 PM

Maybe create a new paths array and in a for loop, copy every 10th element from the initial paths array. Something like:

 Vector3[] newPaths = new Vector3[paths.Length/10];
     int j = 0;
 
     for (int i = 0; i < paths.Length; i+=10) {
         newpaths[j] = paths[i];
         j++;
     }

You can then clear paths and copy newPaths into it.

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avatar image Der_Kevin · Nov 14, 2016 at 02:58 PM 0
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thanks! thats almost perfect. i am just always using the last point. kinda bad since its meant for a coordinate system :D do you have an idea for that?

avatar image skillbow Der_Kevin · Nov 14, 2016 at 04:09 PM 0
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No problem. When you say the last point, do you mean that you use the last point in the array (paths[paths.length])?

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