Remove everything which is duplicate in a List<List<double[]

Hi, I hope you can help me out on this one.

I have a List < List < double[] > > and I want to remove everything which is duplicate in such list. That is:

1) Within the List < double[] > there are some of the double[] which are duplicate.I want to keep only the non-duplicate doubles[] within the List < double[] >.

2) Within List < List < double[] > > there are some of the List < double[] > which are duplicate. I want to keep only the non-repeated lists.

I have tried the following but it doesn't work.

public static List> CleanListOfListsOfDoubleArray(List> input)

{

var output = new List>();

for (int i = 0; i < input.Count; i++)

{

var temp= input[i].Distinct().ToList();

output.Add(temp);

}

return output.Distinct().ToList();

}

Any suggestions?

Many thanks!!!

Problem solved!!

public class ArrayComparer : IEqualityComparer

{

public bool Equals(T[] x, T[] y)

{

return ReferenceEquals(x, y) || (x != null && y != null && x.SequenceEqual(y));

}

public int GetHashCode(T[] obj)

{

return 0;

}

public class ListOfArrayComparer : IEqualityComparer>

{

public bool Equals(List x, List y)

{

return ReferenceEquals(x, y) || (x != null && y != null && x.SequenceEqual(y, new ArrayComparer()));

}

public int GetHashCode(List obj)

{

return 0;

}

The code should then look like this:

public static List> CleanListOfListsOfDoubleArray(List> input)

{

var output = new List>();

for (int i = 0; i < input.Count; i++)

{

var temp = input[i].Distinct(new ArrayComparer()).ToList();

output.Add(temp);

}

return output.Distinct(new ListOfArrayComparer()).ToList();

}

Or even just:

public static List> CleanListOfListsOfDoubleArray(List> input)

{

var output = input.Select(t => t.Distinct(new ArrayComparer()).ToList()).ToList();

return output.Distinct(new ListOfArrayComparer()).ToList();

}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

HappyCode HappyCode11y ago
Problem solved!!

public class ArrayComparer : IEqualityComparer
{
public bool Equals(T[] x, T[] y)
{
return ReferenceEquals(x, y) || (x != null && y != null && x.SequenceEqual(y));
}
public int GetHashCode(T[] obj)
{
return 0;
}
}
public class ListOfArrayComparer : IEqualityComparer>
{
public bool Equals(List x, List y)
{
return ReferenceEquals(x, y) || (x != null && y != null && x.SequenceEqual(y, new ArrayComparer()));
}
public int GetHashCode(List obj)
{
return 0;
}
}
The code should then look like this:
public static List> CleanListOfListsOfDoubleArray(List> input)
{
var output = new List>();
for (int i = 0; i < input.Count; i++)
{
var temp = input[i].Distinct(new ArrayComparer()).ToList();
output.Add(temp);
}
return output.Distinct(new ListOfArrayComparer()).ToList();
}
Or even just:
public static List> CleanListOfListsOfDoubleArray(List> input)
{
var output = input.Select(t => t.Distinct(new ArrayComparer()).ToList()).ToList();
return output.Distinct(new ListOfArrayComparer()).ToList();
}