Array_sum()期望参数1为array, double给定

我在多维数组中有这些值:

array
  0 => 
    array
      0 => float 0.11521247274056
      1 => float 0.081839214900844
      2 => float 0.084168850912272
      3 => float 0.18520831868443
  1 => 
    array
      0 => float 0.92169978192452
      1 => float 0.65471371920675
      2 => float 0.84168850912272
      3 => float 0.43215274359699
  2 => 
    array
      0 => float 0.23042494548113
      1 => float 0.13094274384135
      2 => float 0.16833770182454
      3 => float 0.18520831868443
  3 => 
    array
      0 => float 0.038404157580188
      1 => float 0.09353053131525
      2 => float 0.056112567274848
      3 => float 0.061736106228142

现在，我想要的是每组的和。比如:

[0][0] + [0][1] + [0][2] + [0][3]

用这段代码，我得到了这个错误:array_sum()期望参数1是数组，double给定

for ($i = 0; $i < $numCol; $i++) {
    for ($j = 0; $j < $numCol; $j++) {
        $sumResult[] = array_sum($result[$i][$j]);
    }
}