diff options
Diffstat (limited to 'array.c')
-rw-r--r-- | array.c | 6 |
1 files changed, 5 insertions, 1 deletions
@@ -5667,9 +5667,13 @@ rb_ary_dig(int argc, VALUE *argv, VALUE self) * [].sum(0.0) #=> 0.0 * [1, 2, 3].sum #=> 6 * [3, 5.5].sum #=> 8.5 - * [2.5, 3.0].sum(0.0) {|v| v * v } #=> 15.25 + * [2.5, 3.0].sum(0.0) {|e| e * e } #=> 15.25 * [Object.new].sum #=> TypeError * + * The (arithmetic) mean value of an array can be obtained* as follows. + * + * mean = ary.sum(0.0) / ary.length + * * This method may not respect method redefinition of "+" methods * such as Fixnum#+. * |