Hi, The problem has to do with names. You have a dataset called "slugs", inside this dataset is a column also called "slugs". Now, you attach() the slugs dataset, which adds its contents to the search path, but it adds it *after* the global environment (your workspace) where the dataset "slugs" is located. In short, you are trying to plot the column "product" and the dataset "slugs". You can change one of the names, or just type it out:
plot(as.factor(slugs$product), slugs$slugs) For some more details on this take a look at: ?attach and you can also see this by typing: ls() #lists objects in global environment search() # lists whats in the search path (global environment first) HTH, Josh On Tue, Sep 21, 2010 at 8:27 PM, klsk89 <karenkls...@yahoo.com> 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. > > 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 > -- > View this message in context: > http://r.789695.n4.nabble.com/How-to-fix-error-x-and-y-lengths-differ-tp2549694p2549694.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
