R help - Mar 2012 - reading header in txt file and making histogram

Dear all

I am a BEGINNER and have R on my Mac. I saved my excel file as .txt file, I
have just one column with first row as the column name. My file when read by
R looks like this. After reading the table I try to make a histogram by 
hist(dbh), it says  object dbh not found. What am I doing wrong? thanks
      dbh
1   11.53
2   16.05
3    7.36
4   16.05
5    8.66
6   12.74
7   22.93
8    7.55
9    5.10
10  21.34
11   0.32
12   9.71
13   0.00
14  15.92
15  11.85
16  14.43
17   4.59
18  14.43
19   7.99
20   2.61
21  23.69
22   6.05
23   9.87
24   4.90
25   3.18
26   3.82
27   0.00
28  12.10
29   5.22
30   6.37
31   6.50
32  10.83
33   3.63
34   2.93
35   3.60
36   5.89
37   3.63
38   2.55
39   2.96
40   3.69
41   5.57
42   0.00
43   7.07
44   5.48
45   9.55
46   3.44
47   0.00
48   0.00
49   3.69
50   2.48
51   3.38
52   2.64
53  12.10
54   3.34
55   0.00
56   4.52
57   6.59
58   9.65
59   9.01
60  12.93
61   0.00
62   4.24
63   9.75
64   4.39
65   2.90
66   6.85
67   9.08
68   5.54
69   6.02
70   7.64
71   6.85
72   0.00
73   3.12
74   6.75
75   4.24
76   2.32
77   2.58
78   2.55
79   8.60
80   0.00
81   0.32
82   2.23
83   3.98
84   6.05
85   7.64
86   3.03
87   0.00
88   9.27
89   0.00
90   0.00
91   3.92
92   0.00
93  20.54
94   8.41
95   0.00
96   2.10
97   0.00
98   0.00
99  13.79
100  5.22
101  9.43
102  6.31
103  4.11
104  0.00
105  0.00
106  6.15
107  3.41
108 14.01
109 15.67
110 17.20
111 20.00
112 11.43
113 10.35
114 10.29
115 13.18
116 10.61
117  0.00
118  0.32
119  0.00
120  7.01
121  1.97
122  4.52
123 19.14
124  3.50
125  2.99
126  3.18
127  1.82
128  3.18
129  6.02
130  4.04
131  2.61
132  2.48
133  2.71
134  2.68
135  1.82
136  2.52
137  6.72
138  2.61
139  2.74
140  3.15
141  3.25
142  3.22
143  3.44
144  4.01
145  4.97
146  6.15
147  9.62
148  2.87
149  5.83
150 17.90
151  3.18
152  3.54
153  2.99
154  4.62
155  6.85
156  0.00
157  5.83
158  4.49
159  2.74
160  6.82
161  6.82
162  4.94
163  5.83
164  6.02
165  0.96

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dbh is the column name.  What is the name of your data?
Lets assume your data is called "YOUR_DATA"

then try:

with(YOUR_DATA, hist(dbh))

OR

hist(YOUR_DATA$dbh)

OR

hist(YOUR_DATA[, "dbh"])

etc...






bamboohydraulics wrote
> 
> Dear all
> 
> I am a BEGINNER and have R on my Mac. I saved my excel file as .txt file,
> I have just one column with first row as the column name. My file when
> read by R looks like this. After reading the table I try to make a
> histogram by 
> hist(dbh), it says  object dbh not found. What am I doing wrong? thanks
>       dbh
> 1   11.53
> 2   16.05
> 3    7.36
> 4   16.05
> 5    8.66
> 6   12.74
> 7   22.93
> 8    7.55
> 9    5.10
> 10  21.34
> 11   0.32
> 12   9.71
> 13   0.00
> 14  15.92
> 15  11.85
> 16  14.43
> 17   4.59
> 18  14.43
> 19   7.99
> 20   2.61
> 21  23.69
> 22   6.05
> 23   9.87
> 24   4.90
> 25   3.18
> 26   3.82
> 27   0.00
> 28  12.10
> 29   5.22
> 30   6.37
> 31   6.50
> 32  10.83
> 33   3.63
> 34   2.93
> 35   3.60
> 36   5.89
> 37   3.63
> 38   2.55
> 39   2.96
> 40   3.69
> 41   5.57
> 42   0.00
> 43   7.07
> 44   5.48
> 45   9.55
> 46   3.44
> 47   0.00
> 48   0.00
> 49   3.69
> 50   2.48
> 51   3.38
> 52   2.64
> 53  12.10
> 54   3.34
> 55   0.00
> 56   4.52
> 57   6.59
> 58   9.65
> 59   9.01
> 60  12.93
> 61   0.00
> 62   4.24
> 63   9.75
> 64   4.39
> 65   2.90
> 66   6.85
> 67   9.08
> 68   5.54
> 69   6.02
> 70   7.64
> 71   6.85
> 72   0.00
> 73   3.12
> 74   6.75
> 75   4.24
> 76   2.32
> 77   2.58
> 78   2.55
> 79   8.60
> 80   0.00
> 81   0.32
> 82   2.23
> 83   3.98
> 84   6.05
> 85   7.64
> 86   3.03
> 87   0.00
> 88   9.27
> 89   0.00
> 90   0.00
> 91   3.92
> 92   0.00
> 93  20.54
> 94   8.41
> 95   0.00
> 96   2.10
> 97   0.00
> 98   0.00
> 99  13.79
> 100  5.22
> 101  9.43
> 102  6.31
> 103  4.11
> 104  0.00
> 105  0.00
> 106  6.15
> 107  3.41
> 108 14.01
> 109 15.67
> 110 17.20
> 111 20.00
> 112 11.43
> 113 10.35
> 114 10.29
> 115 13.18
> 116 10.61
> 117  0.00
> 118  0.32
> 119  0.00
> 120  7.01
> 121  1.97
> 122  4.52
> 123 19.14
> 124  3.50
> 125  2.99
> 126  3.18
> 127  1.82
> 128  3.18
> 129  6.02
> 130  4.04
> 131  2.61
> 132  2.48
> 133  2.71
> 134  2.68
> 135  1.82
> 136  2.52
> 137  6.72
> 138  2.61
> 139  2.74
> 140  3.15
> 141  3.25
> 142  3.22
> 143  3.44
> 144  4.01
> 145  4.97
> 146  6.15
> 147  9.62
> 148  2.87
> 149  5.83
> 150 17.90
> 151  3.18
> 152  3.54
> 153  2.99
> 154  4.62
> 155  6.85
> 156  0.00
> 157  5.83
> 158  4.49
> 159  2.74
> 160  6.82
> 161  6.82
> 162  4.94
> 163  5.83
> 164  6.02
> 165  0.96
> 

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Please provide your code as is requested in the posting guidelines.

At a guess, you have read in your data into a data.frame called dhb with a
variable called dhb.

Try hist(dhb$dhb) and see what happens.

To see a bit more of what you've got try
str(dhb) to see what the sdtructure of the data is.

John Kane
Kingston ON Canada

> -----Original Message-----
> From: bamboohydraulics at gmail.com
> Sent: Sun, 25 Mar 2012 22:23:18 -0700 (PDT)
> To: r-help at r-project.org
> Subject: [R] reading header in txt file and making histogram
> 
> Dear all
> 
> I am a BEGINNER and have R on my Mac. I saved my excel file as .txt file,
> I
> have just one column with first row as the column name. My file when read
> by
> R looks like this. After reading the table I try to make a histogram by
> hist(dbh), it says  object dbh not found. What am I doing wrong? thanks
>       dbh
> 1   11.53
> 2   16.05
> 3    7.36
> 4   16.05
> 5    8.66
> 6   12.74
> 7   22.93
> 8    7.55
> 9    5.10
> 10  21.34
> 11   0.32
> 12   9.71
> 13   0.00
> 14  15.92
> 15  11.85
> 16  14.43
> 17   4.59
> 18  14.43
> 19   7.99
> 20   2.61
> 21  23.69
> 22   6.05
> 23   9.87
> 24   4.90
> 25   3.18
> 26   3.82
> 27   0.00
> 28  12.10
> 29   5.22
> 30   6.37
> 31   6.50
> 32  10.83
> 33   3.63
> 34   2.93
> 35   3.60
> 36   5.89
> 37   3.63
> 38   2.55
> 39   2.96
> 40   3.69
> 41   5.57
> 42   0.00
> 43   7.07
> 44   5.48
> 45   9.55
> 46   3.44
> 47   0.00
> 48   0.00
> 49   3.69
> 50   2.48
> 51   3.38
> 52   2.64
> 53  12.10
> 54   3.34
> 55   0.00
> 56   4.52
> 57   6.59
> 58   9.65
> 59   9.01
> 60  12.93
> 61   0.00
> 62   4.24
> 63   9.75
> 64   4.39
> 65   2.90
> 66   6.85
> 67   9.08
> 68   5.54
> 69   6.02
> 70   7.64
> 71   6.85
> 72   0.00
> 73   3.12
> 74   6.75
> 75   4.24
> 76   2.32
> 77   2.58
> 78   2.55
> 79   8.60
> 80   0.00
> 81   0.32
> 82   2.23
> 83   3.98
> 84   6.05
> 85   7.64
> 86   3.03
> 87   0.00
> 88   9.27
> 89   0.00
> 90   0.00
> 91   3.92
> 92   0.00
> 93  20.54
> 94   8.41
> 95   0.00
> 96   2.10
> 97   0.00
> 98   0.00
> 99  13.79
> 100  5.22
> 101  9.43
> 102  6.31
> 103  4.11
> 104  0.00
> 105  0.00
> 106  6.15
> 107  3.41
> 108 14.01
> 109 15.67
> 110 17.20
> 111 20.00
> 112 11.43
> 113 10.35
> 114 10.29
> 115 13.18
> 116 10.61
> 117  0.00
> 118  0.32
> 119  0.00
> 120  7.01
> 121  1.97
> 122  4.52
> 123 19.14
> 124  3.50
> 125  2.99
> 126  3.18
> 127  1.82
> 128  3.18
> 129  6.02
> 130  4.04
> 131  2.61
> 132  2.48
> 133  2.71
> 134  2.68
> 135  1.82
> 136  2.52
> 137  6.72
> 138  2.61
> 139  2.74
> 140  3.15
> 141  3.25
> 142  3.22
> 143  3.44
> 144  4.01
> 145  4.97
> 146  6.15
> 147  9.62
> 148  2.87
> 149  5.83
> 150 17.90
> 151  3.18
> 152  3.54
> 153  2.99
> 154  4.62
> 155  6.85
> 156  0.00
> 157  5.83
> 158  4.49
> 159  2.74
> 160  6.82
> 161  6.82
> 162  4.94
> 163  5.83
> 164  6.02
> 165  0.96
> 
> --
> View this message in context:
>
http://r.789695.n4.nabble.com/reading-header-in-txt-file-and-making-histogram-tp4504813p4504813.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
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> PLEASE do read the posting guide
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____________________________________________________________
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this is what I do, IT READS THE TABLE, But then I am stuck, I removed the
header

read.table("nigeria slr misc/Nigeria India /DBHHISTOGRAM.txt",
header=FALSE)
hist("nigeria slr misc/Nigeria India /DBHHISTOGRAM.txt"$V1)
Error in "nigeria slr misc/Nigeria India /DBHHISTOGRAM.txt"$V1 : 
  $ operator is invalid for atomic vectors

or >
 hist("nigeria slr misc/Nigeria India /DBHHISTOGRAM.txt",V1)
Error in hist.default("nigeria slr misc/Nigeria India
/DBHHISTOGRAM.txt",  :
  'x' must be numeric

or
with("nigeria slr misc/Nigeria India /DBHHISTOGRAM.txt",hist(V1))
Error in eval(substitute(expr), data, enclos = parent.frame()) : 
  invalid 'envir' argument



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If there is a header in your .txt-file you should have header=TRUE, if there
is no header you should have header=FALSE.

You have to save your dataset in a variable, for example:

myData<-read.table("data.txt",header=TRUE)

Then you can make a histogram by:

hist(myData)

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