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I am trying to add discrete labels to a ggplot2 plot with a continuous scale. While there are many questions using stat_function (i.e., about plotting multiple functions) and many about how to use different scales, I'm having trouble understanding how to change the scale in this specific instance.
Here is the plot:
myfun1 <- function(x) (13.076-96.543)*x + (-44.056 +102.057)*x^2 + (17.856 -42.996)*x^3 + (-2.996 + 7.444)*x^4 + (0.190 -0.450)*x^5 + 100.088 + 75.215 # average vs. lowest
myfun2 <- function(x) 13.076*x -44.056*x^2 + 17.856*x^3 -2.996*x^4 + 0.190*x^5 + 100.088 # lowest
myfun3 <- function(x) (13.076-183.093)*x + (-44.056 +229.447)*x^2 + (17.856 -99.353)*x^3 + (-2.996 + 17.517)*x^4 + (0.190 -1.080)*x^5 + 100.088 + 67.115 # highest vs. lowest
df <- data.frame(x = c(0, 6), y = c(0, 6))
myplot_weekday <- ggplot(data = df, aes(x = x, y = y)) +
stat_function(fun = myfun3, aes(color = "Highest")) +
stat_function(fun = myfun2, aes(color = "Lowest")) +
stat_function(fun = myfun1, aes(color = "Average")) +
theme_minimal() +
scale_colour_manual("Students' Course Grade", values = c("red", "black", "blue")) +
theme(legend.position = "top") +
theme(text=element_text(size= 14, family= "Times")) +
ylab("Minutes of Videos Watched") +
xlab("Weekday")
Instead of the continuous labels on the x-axis (0, 2, 4, and 6), I'm trying to add "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", and "Saturday," but I sense I'm approaching this the wrong way.
870
To alter the labels on the axis, add the code +labs(y= "y axis name", x = "x axis name") to your line of basic ggplot code. Note: You can also use +labs(title = "Title") which is equivalent to ggtitle .
scale_x_discrete() and scale_y_discrete() are used to set the values for discrete x and y scale aesthetics. For simple manipulation of scale labels and limits, you may wish to use labs() and lims() instead.
You can use the scale_y_continuous() function in ggplot2 to customize the y-axis of a given plot. This function uses the following basic syntax: p + scale_y_continuous(breaks, n. breaks, labels, limits, ...)
This can be done easily using the ggplot2 functions scale_x_continuous() and scale_y_continuous(), which make it possible to set log2 or log10 axis scale. An other possibility is the function scale_x_log10() and scale_y_log10(), which transform, respectively, the x and y axis scales into a log scale: base 10.
You can set whatever breaks (which will get labels) and corresponding labels that you would like:
+ scale_x_continuous(breaks = 0:6,
labels = paste0(c("Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur"), "day"))
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