ggplot2 plot both x-axis and yaxis horizontally

Question

I am polotting a value and its confidence interval for each test on certain data. x-axis data, y-axis tests.

It takes a lot of space in documentation, i would rather move the y-axis labels to top of the image and arrange the tiles horizontally.

Here is the code that i was using

 p <- ggplot(data, aes(x= DATA, #y=reorder(TEST, VALUE), fill = VALUE))+ geom_tile(colour = 'White', aes(y=TEST, height = 1)) + scale_fill_continuous(na.value = 'salmon')+ guides(fill=guide_legend(title='Tiles'))+ scale_fill_continuous(high = "#4292C6", low = "#C6DBEF")+ #coord_fixed(ratio = 0.1) + xlab("Data") + ylab('Test') + labs(color = 'AUROC') + # geom_text(aes(y=TEST,label = paste0(round(VALUE, 4),'\n','[',CI,']')), size = 4.7, fontface = 'bold') + # ggtitle(name)+ theme_bw()+ ggtitle('Data vs Test') + #theme(aspect.ratio = 1/5) + theme(axis.text=element_text(size=18), axis.title=element_text(size=24), plot.title = element_text(size=26)) + theme(legend.key.size = unit(2,"line"), legend.title = element_text(size=24), legend.text = element_text(size=16)) #legend.position = 'bottom', legend.direction="horizontal") plot(p)

what changes shall i make to arrange the tiles horizontally? Edit:

I'm having a bit of trouble imagining what the desired output is. Can you find an example of what you like the output to be or make drawing of what is should become? — teunbrand
– teunbrand, Commented Aug 25, 2021 at 8:13
@teunbrand Thanks for quick response. I added a dummy image, how i would like to have. — sveer
– sveer, Commented Aug 25, 2021 at 8:20
Doesn't replacing y=TEST by y=1 give something close to what you like? — teunbrand
– teunbrand, Commented Aug 25, 2021 at 8:23
it did! thanks. how can add y labels on top of the plot? can you post it as an answer? I would accept it as answer. — sveer
– sveer, Commented Aug 25, 2021 at 8:27

teunbrand · Accepted Answer · 2021-08-25 09:05:31Z

You can replace y=TEST by y=some_constant to have all the tiles line up in a row. The x-axis can be placed at the top by setting position = 'top' in the scale. Simplified example below:

library(ggplot2) set.seed(42) df <- data.frame( DATA = factor(1:10), TEST = factor(1:10), VALUE = rnorm(10) ) ggplot(df, aes(DATA, y = 1)) + geom_tile(aes(fill = VALUE), colour = "white") + geom_text(aes(label = round(VALUE, 4))) + scale_x_discrete(position = 'top')

^{Created on 2021-08-25 by the reprex package (v2.0.1)}

The solution worked for me and its perfect. I would like to have x-lables on the bottom and correspoding y lables on the top.
Discrete scales don't support secondary axes. To be clear, you cannot have the y-axis labels on the x-axis. You can make a discrete-like axis from a continuous scale and then use the secondary axis to label the top differently from the bottom.

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