On Sep 21, 2010, at 11:27 PM, klsk89 wrote:
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.
This is not a homework help site. You could try seeing if the slugs
data.frame has the structure you expected with:
str(slugs) # I cannot say whether the attach()-ment is going to mess
this up because I NEVER use attach. Seems having a datafame named the
same as a column could be a confusing strategy. In fact you may have
provided yet another reason why attach should NEVER be used.
I made this into a dataframe called "slug":
with(slug, plot(as.factor(product),slugs)) # a perfectly fine plot
> slugs <- slug
> attach(slugs)
The following object(s) are masked _by_ '.GlobalEnv':
slugs
> tapply(slugs,product,mean)
Error in tapply(slugs, product, mean) : arguments must have same length
> plot(as.factor(product),slugs)
Error in xy.coords(x, y, xlabel, ylabel, log) :
'x' and 'y' lengths differ
OK, now I will say it again. NEVER use attach().
--
David.
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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