Adding elements in the sublists

Question

How can I add the elements in the sublists?
For example, if I have the list which is

 m={{1,3},{2,3},{4,1}}

then, the output that I want is 3+3+1=10. How can I do this?

You can use Part to get the elements from the list, then Total to sum them up.
Plus @@@ (m\[Transpose]) will give you a list of the sums of the various elements of your list.

Murta · Answer 1 · 2012-10-30 18:46:08Z

up vote 2 down vote

I thinks the cleanest way is:

Total[m[[All, 2]]]

using Esc[[Esc and Esc]]Esc.

If you use it a lot (like me), you can create shortcuts as explained here.

edited Oct 30 '12 at 18:46

answered Oct 30 '12 at 12:49

Murta
4,4121336

	You can use these shortcuts if you don't like pressing `Esc` every time for `Part` brackets – rm -rf♦ Oct 30 '12 at 14:27
	Yes, I use it. I put in the post. Tks – Murta Oct 30 '12 at 18:46

chris · Answer 2 · 2012-10-30 12:29:06Z

up vote 1 down vote

Following @b.gatessucks

 Total[m[[;; , 2]]]

  (* 7 *)

If you want to sum all components (as @image_doctor pointed out too, sorry I missed that)

 Plus @@@ Transpose[m]

 (* 7 7 *)

edited Oct 30 '12 at 12:29

answered Oct 30 '12 at 12:00

chris
5,1742628

1

Total[m[[All , 2]]] works as well. :) – J. M.♦ Oct 30 '12 at 12:05

s0rce · Answer 3 · 2012-10-30 14:10:28Z

up vote 0 down vote

Last@Total[{{1, 3}, {2, 3}, {4, 1}}]

or

Total[{{1, 3}, {2, 3}, {4, 1}}]

for both components

answered Oct 30 '12 at 14:10

s0rce
3,625633

3 Answers