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    <p>If you want to expand the y-limits for a plot with faceting in ggplot2, you could do the following approach:</p> <pre><code>library(ggplot2) library(reshape2) set.seed(1) N &lt;- 24 dates = seq(as.Date("2014-01-01"), as.Date("2015-12-01"), by = "1 month") dummy_data &lt;- data.frame(dates = dates, x = rnorm(N,0,1), group = sample(c("A", "B", "C"), size = N, replace = TRUE)) dummy_data_m &lt;- melt(dummy_data, id.vars = c("dates", "group")) plot = ggplot(data = dummy_data_m, aes(x = dates, y = value, colour = variable)) + geom_point() + facet_grid(group ~., scales="free_y") print(plot) # Want to modify y-axis on this plot for each panel # to expand plot axes, build the y ranges in a data.frame and add a new layer to the plot using geom_blank # pick an x.value in the range of your x-values in dummy_data x.value = as.Date("2014-01-01") x.value = as.Date("2014-01-01") # Say you want to expand the y-axis ranges for the different subpanels to be (-5, 5), (-4, 4), (-2, 2). # If you simply plot at this point the y limits are roughly ~(-1.5, 1.5) for each plot lower_y = data.frame(dates = x.value, group = c("A", "B", "C"), value = c(5, 4, 2)) y_ranges = rbind(lower_y, upper_y) y_ranges_m = melt(y_ranges, id.vars = c("dates", "group")) plot = plot + geom_blank(data = y_ranges_m, aes(x = dates, y = value, colour = variable)) print(plot) </code></pre> <p>For the opposite case, if you want to decrease the y range, then remove observations from the data in the panels for which you want to shrink the y-axis. For example (instead of expanding the y-axis as above):</p> <pre><code># do not want to plot any values where y &lt; 0 for group A dummy_data2 = dummy_data x_adjusted = dummy_data2$x x_adjusted[x_adjusted &lt; 0 &amp; dummy_data2$group == "A"] = NA dummy_data2$x = x_adjusted dummy_data_m2 &lt;- melt(dummy_data2, id.vars = c("dates", "group")) plot = ggplot(data = dummy_data_m2, aes(x = dates, y = value, colour = variable)) + geom_point() + facet_grid(group ~., scales="free_y") print(plot) # this will show a plot where the panel for A has a y-axis lower limit above 0 </code></pre>
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    1. COThanks a lot. It works!
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      1. USajestudillo
 

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