两个一维数组减去一个固定值3，得到的数组怎么保存？
double [] z;
double [] x = {31.01, 31, 31.09};
double [] y = { 121.2, 121.4, 121.14};
for (int i = 0; i < x.Length ; i++)
{
for (int j = 0; j < y.Length; j++)
{
z= Convert.ToDouble(x.ElementAt(i)) - Convert.ToDouble(3)+Convert.ToDouble(y.ElementAt(j)) - Convert.ToDouble(3)；这里保存不了z，z应该是一个3维数组？
}
}

[解决办法]

C# code

double[] x = { 31.01, 31, 31.09 };                double[] new_array = x.Select(a=>a+3).ToArray();
[解决办法]
   double[] x = { 31.01, 31, 31.09 };
           double[] z = { 0, 0, 0 };
           double[] t = new double[x.Length];

           for (int i = 0; i <= x.Length-1 ; i++)
           {
               z[i] = x[i] + 3.0;
               t[i] = x[i] + 4.0;
           }
[解决办法]
探讨

double [] x = {31.01, 31, 31.09};
简单点，我想一维数组分别加个固定值3，怎么得到的新数组？