I have a simple array of tuples
val arr = Array((1,2), (3,4),(5,6),(7,8),(9,10))
I wish to get (1+3+5+7+9, 2+4+6+8+10)
tuple as the answer
What is the best way to get the sum as tuples, similar to regular arrays. I tried
val res = arr.foldLeft(0,0)(_ + _)
This does not work.
Sorry about not writing the context. I was using it in scalding with algebird. Algebird allows sums of tuples and I assumed this would work. That was my mistake.
There is no such thing as Tuple
addition, so that can't work. You would have to operate on each ordinate of the Tuple
:
val res = arr.foldLeft(0,0){ case (sum, next) => (sum._1 + next._1, sum._2 + next._2) }
res: (Int, Int) = (25,30)
This should work nicely:
arr.foldLeft((0,0)){ case ((a0,b0),(a1,b1)) => (a0+a1,b0+b1) }
Addition isn't defined for tuples.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With