[R] Create a sequence

[Marc Schwartz]

> On Apr 9, 2019, at 9:07 AM, bienvenidozoma using gmail.com wrote:
> 
> how to create
> u = (1, −1, 2, −2, . . . , 100, −100)  in r
> 
> Thanks
> Bienvenue

Hi,

See ?seq and ?rep

> rep(seq(100), each = 2) * c(1, -1)
  [1]    1   -1    2   -2    3   -3    4   -4    5   -5    6   -6    7
 [14]   -7    8   -8    9   -9   10  -10   11  -11   12  -12   13  -13
 [27]   14  -14   15  -15   16  -16   17  -17   18  -18   19  -19   20
 [40]  -20   21  -21   22  -22   23  -23   24  -24   25  -25   26  -26
 [53]   27  -27   28  -28   29  -29   30  -30   31  -31   32  -32   33
 [66]  -33   34  -34   35  -35   36  -36   37  -37   38  -38   39  -39
 [79]   40  -40   41  -41   42  -42   43  -43   44  -44   45  -45   46
 [92]  -46   47  -47   48  -48   49  -49   50  -50   51  -51   52  -52
[105]   53  -53   54  -54   55  -55   56  -56   57  -57   58  -58   59
[118]  -59   60  -60   61  -61   62  -62   63  -63   64  -64   65  -65
[131]   66  -66   67  -67   68  -68   69  -69   70  -70   71  -71   72
[144]  -72   73  -73   74  -74   75  -75   76  -76   77  -77   78  -78
[157]   79  -79   80  -80   81  -81   82  -82   83  -83   84  -84   85
[170]  -85   86  -86   87  -87   88  -88   89  -89   90  -90   91  -91
[183]   92  -92   93  -93   94  -94   95  -95   96  -96   97  -97   98
[196]  -98   99  -99  100 -100


Regards,

Marc Schwartz