Incorporating cumsum in for loop

Hello

Hello i have this DF:

c

CHR_NR                                                                                             
diffdato1             x
1022   10395 1994-05-30        11.0       39       0 1994     1         1     
0          0        24      1    1  24
29100  11377 2003-05-22        17.0       24       0 2003     1         1     
0          0        15      1    1  29
29409  11377 2003-06-06        18.8       15       0 2003     1         0     
0          0        14      0    1  29
28964  11377 2003-07-04        20.1       14       0 2003     1         1     
0          0        17      1    1  59
29422  11377 2003-07-21        32.9       17       0 2003     1         0     
0          0        14      0    1  59
28605  11377 2003-08-04        19.9       14       0 2003     1         0     
0          0        14      0    1  59
28996  11377 2003-08-18        10.5       14       0 2003     1         0     
0          0        14      0    1  59
29932  11377 2003-12-08        20.5       27       0 2003     1         1     
0          0        29      1    1  78
30393  11377 2004-01-06        28.6       29       0 2004     1         0     
0          0         8      0    1  78
36100  11377 2004-01-14        28.6        8       0 2004     1         0     
0          0         8      0    1  78
30847  11377 2004-01-22        19.0        8       0 2004     1         0     
0          0         7      0    1  78
34549  11377 2004-01-29        19.0        7       0 2004     1         0     
0          0         7      0    1  78
30035  11377 2004-02-05        14.4        7       0 2004     1         0     
0          0         7      0    1  78
34550  11377 2004-02-12        14.4        7       0 2004     1         0     
0          0        12      0    1  78
42629  11493 2007-05-31        11.8       31       0 2007     1         1     
0          0        25      1    1  25
20900  12558 2000-06-30        49.8       38       0 2000     1         1     
0          0        27      1    1 118
21618  12558 2000-07-27        51.0       27       0 2000     1         0     
0          0        14      0    1 118
22014  12558 2000-08-10        36.6       14       0 2000     1         0     
0          0        14      0    1 118
21405  12558 2000-08-24        18.6       14       0 2000     1         0     
0          0        14      0    1 118
21790  12558 2000-09-07        21.9       14       0 2000     1         0     
0          0        14      0    1 118
22185  12558 2000-09-21        14.4       14       0 2000     1         0     
0          0        35      0    1 118
16695  13018 1999-02-09        19.0       33       0 1999     1         1     
0          0        14      1    1  14
22315  13018 2000-08-18        21.8       36       0 2000     1         1     
0          0        28      1    1  81
22029  13018 2000-09-15        26.2       28       0 2000     1         0     
0          0        14      0    1  81
21280  13018 2000-09-29        20.2       14       0 2000     1         0     
0          0        14      0    1  81
21738  13018 2000-10-13        10.1       14       0 2000     1         0     
0          0        25      0    1  81
24610  13018 2001-09-17        31.3       27       0 2001     1         1     
0          0        17      1    1  32
23958  13018 2001-10-04        15.2       17       0 2001     1         0     
0          0        15      0    1  32
43479  13168 2007-10-03        15.6       33       0 2007     1         1     
0          0        35      1    1  35
44755  13168 2008-04-04        18.3       23       0 2008     1         1     
0          0        25      1    1  25
45355  13168 2008-07-04        15.2       36       0 2008     1         1     
0          0        32      1    1  66
45540  13168 2008-08-05        10.3       32       0 2008     1         0     
0          0        34      0    1  66

And I want like this for every x-value, illustrated with x=118:

a

CHR_NR   diffdato diffCHR  aar ind10 diffind10 dato63 diffdato63                 
diffdato1              x  akkusum
12558 2000-06-30        49.8       38       0 2000     1         1      0         
0        27      1    1 118      27 12558 2000-07-27        51.0       27      
0 2000     1         0      0          0        14      0    1 118      41
12558 2000-08-10        36.6       14       0 2000     1         0      0         
0        14      0    1 118      55
12558 2000-08-24        18.6       14       0 2000     1         0      0         
0        14      0    1 118      69
12558 2000-09-07        21.9       14       0 2000     1         0      0         
0        14      0    1 118      83
12558 2000-09-21        14.4       14       0 2000     1         0      0         
0        35      0    1 118     118

So I want the vector "akkusum" just for the whole dataset, i thought of
using af for loop with cumsum (which i have used in the example with x=118
where i did a$akkusum <- cumsum(a$diffdato1)), but i don't know how to set
it up.

Hope anyone can help me.

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