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This is my dataframe in R,

New York  8755
     Texas  7654
California  6726
   Florida  6322

I simply want the graph to compare the numbers in a bar stacked side by side.I have not been able to achieve that. I am getting the error "Height must be a vector of Matrix." Please suggest! Thanks a lot!

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    What is the command you are using to plot it? You probably want something like this - barplot(x$V2,names.arg=x$V1) where x is your data, and v1 and v2 are the names of the city and data columns. Commented Jun 26, 2015 at 18:09
  • I was using barplot(us.june) Error in barplot.default(us.june) : 'height' must be a vector or a matrix > barplot(us.june) Commented Jun 26, 2015 at 18:19
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    so, barplot(us.june[,2],names.arg=us.june[,1]). You need to tell R which column is the data, and which is the names. The error you got is R telling you it needed only numbers to plot, but you gave it something else. Commented Jun 26, 2015 at 18:22
  • Thanks a lot.. I was working on it for quite a while! I will keep this in mind now. Commented Jun 26, 2015 at 18:26

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R cannot tell which variable is which when you pass it an entire data.frame to plot. In this case, the error, 'height' must be a vector or a matrix is telling you you didn't give the plot function what it wanted.

For a barplot, using ?barplot will tell you what is needed:

barplot(height, width = 1, space = NULL, names.arg = NULL ....

In your case, you have a data.frame with heights in the second column, and names in the first, so you want to do:

barplot(data[ ,2], names.arg = data[ ,1])
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