How to print a long list without indexes?

Question

How to print a long list without indexes ?

The output I get :

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

Desired output :

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

I tried with cat() function but it doesn't do line returns.

Thanks in advance.

Answer 1

A neat solution is cat but using its fill argument, in combination with the format() function.

cat(format(1:100), fill = getOption("width"))

which gives

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

I haven't tried this with all kinds of vectors to know if the filling/splitting is infallible but it might be sufficient for your needs if alignment is important.

The advantage of using format() here (rather than paste()) is that format() pads the individual strings to a common length

> format(1:10)
 [1] " 1" " 2" " 3" " 4" " 5" " 6" " 7" " 8" " 9" "10"

If you just fill the catted numeric vector or a pasted representation, the alignment is still off:

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

Answer 2

Try the option

 fill =TRUE

with

 cat()

Here is an example:

 > cat(paste(1:100), fill=TRUE)

It will break lines depending on the width of your screen.