[R] "Invalid object" error in boxplot

From: <mm745_at_st-andrews.ac.uk>
Date: Tue, 01 Jul 2008 16:21:50 +0100


Hi,

I'm trying to make a boxplot with the data at the end of the message, and when I try to execute the command

>boxplot(Diatoms) (or for any other field instead of "Diatoms")

I get the following error message:

Error in oldClass(stats) <- cl : adding class "factor" to an invalid object

Any advice would be much appreciated.

Thanks a lot,

Miriam

         Date Depth Diatoms  Bacteria         V1      V2      V3
1  15/02/2000     0      17   700,000 14,067,895 380,000  69,000
2  15/02/2000     2      17   316,680  9,311,160 250,000  26,000
3  15/02/2000    10      20   313,010  8,422,355 460,000  30,000
4  15/02/2000    20      21   374,535  9,259,900 280,000  33,000
5  22/02/2000     0      21   370,000 16,952,360 320,000  72,000
6  22/02/2000     2      21   462,480 10,526,390 360,000  64,000
7  22/02/2000    10      39   374,860  8,378,655 290,000  49,000
8  22/02/2000    20     140   381,900  9,468,550 390,000  73,000
9  29/02/2000     0     240   200,000  5,783,980 440,000  61,000
10 29/02/2000     2     240   224,125  8,077,105 600,000  89,000
11 29/02/2000    10     110   190,810  8,154,005 600,000  61,000
12 29/02/2000    20     460   177,050  8,333,120 600,000  69,000
13 08/03/2000     0   1,800   270,000  5,277,265 200,000  34,000
14 08/03/2000     2   1,800   403,380  9,237,105 490,000  80,000
15 08/03/2000    10   1,400   372,530 10,624,735 480,000  57,000
16 08/03/2000    20   3,100   261,215  6,228,160 340,000  37,000
17 14/03/2000     0   4,900   750,000 16,258,720 440,000  80,000
18 14/03/2000     2   4,900   633,895 10,952,305 380,000  54,000
19 14/03/2000    10   4,100   583,367 10,383,383 310,000  53,000
20 14/03/2000    20   8,200   653,945 10,148,210 380,000  48,000
21 21/03/2000     0     850   570,000 11,000,000 180,000 170,000
22 21/03/2000     2     850   520,000 27,000,000 130,000 190,000
23 21/03/2000    10   1,800   540,000 21,000,000 250,000 140,000
24 21/03/2000    20   1,800   470,000 10,000,000 110,000  70,000
25 27/03/2000     0   1,300   640,000 13,000,000 170,000  90,000
26 27/03/2000     2   1,300   770,000 17,000,000 230,000 120,000
27 27/03/2000    10     520   720,000 15,000,000 120,000 170,000
28 27/03/2000    20     130   620,000 12,000,000  98,000  74,000
29 04/04/2000     0   2,003   940,000 29,582,000 190,000  46,000
30 04/04/2000     2   2,003   952,400 27,186,525 210,000  67,000
31 04/04/2000    10   1,671   503,300 11,140,225  85,000  24,000
32 04/04/2000    20     863   682,550 14,605,825 140,000  32,000
33 07/04/2000     0   1,653   840,000 15,862,125 370,000  95,000
34 07/04/2000     2   1,653   819,350 13,099,600 280,000  67,000
35 07/04/2000    10   1,520   769,825 13,395,825 240,000  57,000
36 07/04/2000    20     422   784,700 10,910,700 170,000  28,000
37 12/04/2000     0   7,671   640,000  9,851,750 470,000 100,000
38 12/04/2000     2   7,671   600,625  9,339,400 490,000 170,000
39 12/04/2000    10   5,865   585,650  8,439,300 450,000 180,000
40 12/04/2000    20   1,276   595,225  7,297,150 360,000  92,000
41 14/04/2000     0  10,479   730,000 12,406,650 540,000 140,000
42 14/04/2000     2  10,479   700,000 10,406,650 490,000 110,000
43 14/04/2000    10   6,576   682,500  9,869,050 470,000 100,000
44 14/04/2000    20   3,307   739,075  8,875,250 420,000 180,000
45 16/04/2000     0   1,636   890,000  9,653,050 290,000 120,000
46 16/04/2000     2   1,636   885,725  9,934,300 300,000  97,000
47 16/04/2000    10   2,986   973,750 10,270,975 310,000 190,000
48 16/04/2000    20   1,222   629,250  6,792,500 210,000  90,000
49 19/04/2000     0     656   730,000 12,751,350 510,000 150,000
50 19/04/2000     2     656   831,575 13,673,700 400,000 120,000
51 19/04/2000    10     480   723,925 11,230,150 420,000 100,000
52 19/04/2000    20     872   671,975  9,858,900 330,000  97,000
53 27/04/2000     0     180 1,000,000 15,346,525 370,000  85,000
54 27/04/2000     2     180   926,800 22,825,400 670,000  93,000
55 27/04/2000    10       7   880,925 15,121,675 490,000  86,000
56 27/04/2000    20      64   723,100 10,638,400 230,000  21,000


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