cannot implicitly convert type double to double

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Simple_Spreadsheet
{
class Median
{
private double[] columnA = new double[5], median;

public Median(double[] columnA)
{
this.columnA[0] = columnA[0];
this.columnA[1] = columnA[1];
this.columnA[2] = columnA[2];
this.columnA[3] = columnA[3];
this.columnA[4] = columnA[4];
}

public void setA1(double[] columnA)
{
this.columnA[0] = columnA[0];
}
public double getA1()
{
return columnA[0];
}

public void setA2(double[] columnA)
{
this.columnA[1] = columnA[1];
}
public double getA2()
{
return columnA[1];
}

public void setA3(double[] columnA)
{
this.columnA[2] = columnA[2];
}
public double getA3()
{
return columnA[2];
}

public void setA4(double[] columnA)
{
this.columnA[3] = columnA[3];
}
public double getA4()
{
return columnA[3];
}

public void setA5(double[] columnA)
{
this.columnA[4] = columnA[4];
}
public double getA5()
{
return columnA[4];
}

public double calcMedian(double[] columnA)
{
this.columnA[0] = columnA[0];
this.columnA[1] = columnA[1];
this.columnA[2] = columnA[2];
this.columnA[3] = columnA[3];
this.columnA[4] = columnA[4];

Array.Sort(columnA);

median = columnA[2] ;

return median;
}
}

Answer 1

im trying to calculate the median can someone please help?

Answer 2

Can you show this code in the playground.

I like to see sample data and how to call this method ?