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I wrote this code to create a map.
ggplot(data = Canada2015_Import_3) +
borders(database = "world",
colour = "grey60",
fill="grey90") +
geom_polygon(aes(x=long, y=lat, group = group, fill = Trade_Value_mean),
color = "grey60") +
scale_fill_gradient(low = "blue", high = "red", name = "Trade Value") +
ggtitle("Canadien Imports in 2015") +
xlab("") + ylab("") +
theme(panel.background = element_blank(),
plot.title = element_text(face = "bold"),
axis.title.x=element_blank(),
axis.text.x=element_blank(),
axis.ticks.x=element_blank(),
axis.title.y=element_blank(),
axis.text.y=element_blank(),
axis.ticks.y=element_blank())
This map gives me a legend with scientific notation, and I would like to change it to normal or with commas.
Does anybody know how to do that?
Here is the basic structure of my data frame.
Country Trade_Value_mean long lat group order subregion
Afghanistan 2359461 74.89131 37.23164 2 12 <NA>
All help is appreciated.
610
The scale_x_continuous() and scale_y_continuous() methods can be used to disable scientific notation and convert scientific labels to discrete form.
You can use the following syntax to change the legend labels in ggplot2: p + scale_fill_discrete(labels=c('label1', 'label2', 'label3', ...))
Method 1: Change Legend Title using guides() Function. Now if we want to change Legend Title then we have to add guides and guide_legend functions to the geom_point function. Inside guides() function, we take parameter named 'color' because we use color parameter for legend in ggplot() function.
You can place the legend literally anywhere. To put it around the chart, use the legend. position option and specify top , right , bottom , or left . To put it inside the plot area, specify a vector of length 2, both values going between 0 and 1 and giving the x and y coordinates.
I figured it out. Basically all you have to do is insert the scales library and add labels = comma. Here's the modified code :
library(scales)
ggplot(data = Canada2015_Import_3) +
borders(database = "world",
colour = "grey60",
fill="grey90") +
geom_polygon(aes(x=long, y=lat, group = group, fill = Trade_Value_mean),
color = "grey60") +
scale_fill_gradient(low = "blue", high = "red", name = "Trade Value", labels = comma) +
ggtitle("Canadien Imports in 2015") +
xlab("") + ylab("") +
theme(panel.background = element_blank(),
plot.title = element_text(face = "bold"),
axis.title.x=element_blank(),
axis.text.x=element_blank(),
axis.ticks.x=element_blank(),
axis.title.y=element_blank(),
axis.text.y=element_blank(),
axis.ticks.y=element_blank())
you can also use at the beginning of your code:
options(scipen=10000)
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