[R] RES: "Invalid object" error in boxplot

[Leandro Marino]

HI Miriam,

the problem is that you have the Date and some other factors in your
database.

try to use the

lapply(your_base,class)

and see what appears. If you have any kind of factor or date you cannot use
boxplot.

If you verify that only V1, V2 and V3 are numeric you can do the box plot
with this sintax:

boxplot(your_base[,c("V1","V2","V3"])
or
boxplot(your_base[,c(5:7)]






Leandro Marino


-----Mensagem original-----
De: r-help-bounces em r-project.org [mailto:r-help-bounces em r-project.org]Em
nome de mm745 em st-andrews.ac.uk
Enviada em: terca-feira, 1 de julho de 2008 12:22
Para: r-help em r-project.org
Assunto: [R] "Invalid object" error in boxplot


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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