How can I extract plot axes’ ranges for a ggplot2 object?

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I am using ggplot2 version 2, I am not sure if this is same is previous version,
Suppose you have saved your plot on plt object. It is easy to extract the ranges,

# y-range
layer_scales(plt)$y$range$range

# x-range
layer_scales(plt)$x$range$range

In case of facet plot, you can access scales of individual facets using layer_scales(plot, row_idx, col_idx). For example to access the facet at first row and second column,

# y-range
layer_scales(plt, 1, 2)$y$range$range

# x-range
layer_scales(plt, 1, 2)$x$range$range

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