[R] How to fix error: 'x' and 'y' lengths differ

[klsk89]

Hi, im a student so still very new to R. Hope someone could help me out here
=)
They are 3 slug control products, bustaslug, product X and Y. Im ask to
explore the data by plot() and tapply(). But when i try to plot or use the
tapply command, it tells me that the x and y lengths differ. so im thinking
its because the data is unbalanced? Is there a simple command that i could
use to fix this? Thanks for the help. 

Heres what i did.

> attach(slugs)
> slugs

    product       slugs
1  bustaslug     5
2  bustaslug     2
3  bustaslug     3
4  bustaslug     0
5  bustaslug     4
6  bustaslug     4
7  bustaslug     1
8  bustaslug     5
9  bustaslug     6
10 bustaslug     4
11  productX     0
12  productX     3
13  productX     4
14  productX     1
15  productX     2
16  productX     2
17  productX     4
18  productX     0
19  productX     3
20  productX     1
21  productY     7
22  productY     9
23  productY    11
24  productY     5
25  productY    13
26  productY     7
27  productY     8
28  productY    12
29  productY    10
30  productY    14


> plot(as.factor(product),slugs)
Error in xy.coords(x, y, xlabel, ylabel, log) : 
  'x' and 'y' lengths differ

> tapply(slugs,product,mean)
Error in tapply(slugs, product, mean) : arguments must have same length
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