Feature request: Element multiplication

[dicom]

First of all, thanks for your work on this great Ruby gem!

On one of my recent projects, I needed to multiply all the elements of my NArray. I searched the documentation, hoping to find an equivalent to the .sum method, but it seems to me there is none. I think it would be useful to have such a method included in the NArray library. Below I will paste the solution I used, extending the narray class and converting to a ruby array and finally multiplying the elements:

# Multiplies all elements in the array and returns the resulting number:
class NArray
  def multiply
    self.to_a.inject(:*)
  end
end

a = NArray[2,3,7]
a.sum
=> 12
a.multiply
=> 42

Best regards,
Chris

[masa16]

added:
$ irb -I. -Ilib -r narray
irb(main):001:0> NArray.float(5).indgen!(1).prod
=> 120.0
irb(main):002:0> NArray.float(5).indgen!(1).cumprod
=> NArray.float(5):
[ 1.0, 2.0, 6.0, 24.0, 120.0 ]

[dicom]

That's great. Very fast reaction!
Thank you very much.