如何将Int [] []转换为Double [] []？

int[2][1] = 25

int[2][1] = 25

value = File.ReadLines(filename)
            .Select(line => line.Split(new[] { \' \' }, StringSplitOptions.RemoveEmptyEntries)
                .Select(MyIntegerParse)
                .ToArray()
                )
            .ToArray();

.Select(x => (double)MyIntegerParse(x))

private double[][] intarraytodoublearray(int[][] val) 
        {
            var ret = new double[val.Length][];
            for (int i = 0; i < val.Length; i++ )
            {
                ret[i] = new double[val[i].Length];
                for (int j = 0; j < val[i].Length; j++) 
                {
                    ret[i][j] = (double)val[i][j];
                }
            }
            return ret;
        }