How to sum the second position data in an array (50000x2) with the same value in the first position

Hello everyone im having some issues trying to solve this. I have an array with this form

A=

2.79314 0.007

2.79314 0.083

2.79314 0.051

2.91205 0.06

2.91205 0.06

2.97143 0.08

2.97143 0.06

2.97143 0.07

2.97143 0.08

What i want is that whenever the data of the first column is the same, sum the data in the second column.This is what I want to obtain:

B=

2.79314 (0.007+0.083+0.051)

2.91205 (0.06+0.06+0.08)

2.97143 (0.08+0.06+0.07+0.08)

Thnak you very much in advance.

Regards.

Answer 1

[Stephen23]

Method one: accumarray:

>> [U,~,G] = uniquetol(A(:,1));
>> S = accumarray(G(:),A(:,2));
>> M = [U,S]
M =
   2.79314   0.14100
   2.91205   0.12000
   2.97143   0.29000

Mehod two: splitapply:

>> S = splitapply(@sum,A(:,2),G);
>> M = [U,S]
M =
    2.7931    0.1410
    2.9120    0.1200
    2.9714    0.2900

[Borja Zamarreño]

Thank you very much for your help!!!!