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R Graphics - Bars
A bar chart uses rectangular bars to visualize data. Bar charts can be displayed horizontally or vertically. The height or length of the bars are proportional to the values they represent
Bar Charts
A bar chart uses rectangular bars to visualize data. Bar charts can be displayed horizontally or vertically. The height or length of the bars are proportional to the values they represent.
Use the barplot() function to draw a vertical bar chart:
Example
# x-axis values
x <- c("A", "B", "C", "D")
# y-axis values
y <- c(2, 4, 6, 8)
barplot(y, names.arg = x)
Result:
Example Explained
x variable represents values in the x-axis (A,B,C,D)y variable represents values in the y-axis (2,4,6,8)barplot() function to
create a bar chart of the valuesnames.arg defines the names of each observation in the x-axisBar Color
Use the col parameter to change the color of the bars:
Example
x <- c("A", "B", "C", "D")
y <- c(2, 4, 6, 8)
barplot(y, names.arg = x,
col = "red")
Result:
Density / Bar Texture
To change the bar texture, use the density
parameter:
Example
x <- c("A", "B", "C", "D")
y <- c(2, 4, 6, 8)
barplot(y, names.arg = x,
density = 10)
Result:
Bar Width
Use the width parameter to change the width of the bars:
Example
x <- c("A", "B", "C", "D")
y <- c(2, 4, 6, 8)
barplot(y, names.arg = x,
width = c(1,2,3,4))
Result:
Horizontal Bars
If you want the bars to be displayed horizontally instead of vertically, use horiz=TRUE:
Example
x <- c("A", "B", "C", "D")
y <- c(2, 4, 6, 8)
barplot(y, names.arg = x,
horiz = TRUE)
Result:
