Adding Horizontal Lines to Image/Tile plot

[Andrew Redd]

I've attached a pdf of a tile plot that I am using to help check for problems in an algorithm.  What would help would be to add horizontal lines, and only horizontal lines to the plot to separate the rows.  Is there an easy way to do this?  The plot was created with

qplot(melt(rows), x=X1, y=X2, fill=value, geom="tile")

The principle is the same regardless of the underlying data so if you need a working example from the package documentation should work.

ggplot(mtcars, aes(y=factor(cyl), x=mpg)) + stat_bin(aes(fill=..count..), geom="tile", binwidth=3, position="identity")

Thanks,

Andrew

[Andrew Redd]

Thank you all,

Both solutions give horizontal lines through the middle of the tiles, and what I want is at the edge of the tiles.  This is more what I was thinking, but it a little ugly.  I thought that there might be a theme setting or something else handy.  All told it gets me what I wanted.

ggplot(mtcars, aes(y=factor(cyl), x=mpg)) + stat_bin(aes(fill=..count..), geom="tile", binwidth=3, position="identity")+

geom_hline(aes(yintercept=c(as.numeric(factor(cyl))+.5,.5))) 

Thanks,

Andrew

On Tue, Feb 8, 2011 at 10:56 AM, <Adam_L...@keybank.com> wrote:

ggplot(mtcars, aes(y=factor(cyl), x=mpg)) + stat_bin(aes(fill=..count..), geom="tile", binwidth=3, position="identity")+geom_hline(aes(yintercept=factor(cyl)))


Adam Loveland

Andrew Redd <amr...@gmail.com> Sent by: ggp...@googlegroups.com 02/08/2011 12:51 PM

To ggplot2 <ggp...@googlegroups.com> cc Subject Adding Horizontal Lines to Image/Tile plot

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[Adam_L...@keybank.com]

ggplot(mtcars, aes(y=factor(cyl), x=mpg)) + stat_bin(aes(fill=..count..), geom="tile", binwidth=3, position="identity")+geom_hline(aes(yintercept=factor(cyl)))


Adam Loveland

Andrew Redd <amr...@gmail.com> Sent by: ggp...@googlegroups.com 02/08/2011 12:51 PM

To ggplot2 <ggp...@googlegroups.com> cc Subject Adding Horizontal Lines to Image/Tile plot

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You received this message because you are subscribed to the ggplot2 mailing list.
Please provide a reproducible example:

http://gist.github.com/270442