[R] have I an actual matrix?

[Michael Kubovy]

On Nov 7, 2006, at 6:25 PM, Ricardo Rodríguez - Your EPEC ICT Team  
wrote:

> library(RMySQL)
> con <- dbConnect(dbDriver
> ("MySQL"),host='localhost',username='root',dbname='ibdona')
> rs <- dbGetQuery (con,"select n,year from ibdona.library_location")
> dbDisconnect(con)
> Graph <- barplot(rs)
>
> And here the error I get...
>
> Error in barplot.default(rs) : 'height' must be a vector or a matrix
>
> paste(rs) gives me...
>
> [1] "c(307, 65, 2, 28, 3, 229, 81, 5, 7, 558, 134, 53, 9)"
> [2] "c(2002, 2002, 2002, 2002, 2002, 2003, 2003, 2003, 2003, 2004,
> 2004, 2004, 2004)"

nums <- c(307, 65, 2, 28, 3, 229, 81, 5, 7, 558, 134, 53, 9)
names(nums) <- c(2002, 2002, 2002, 2002, 2002, 2003, 2003, 2003,  
2003, 2004, 2004, 2004, 2004)
barplot(nums)

or

require(gplots)
barplot2(nums, plot.grid = TRUE, las = 1) # offers many nice options
_____________________________
Professor Michael Kubovy
University of Virginia
Department of Psychology
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