使用 ggplot2 我正在绘制几个函数和一系列点。我不知道如何表示图例上的点。我意识到我需要使用 aes() 函数,但我不完全了解如何执行此操作。我很抱歉这个例子太长了,但我不知道如何说明它。
## add ggplot2
library(ggplot2)
# Declare Chart values
y_label = expression("y_axis"~~bgroup("(",val / km^{2},")"))
x_label = "x_axis"
#############################
## Define functions
# Create a list to hold the functions
funcs <- list()
funcs[]
# loop through to define functions
for(k in 1:21){
# Make function name
funcName <- paste('func', k, sep = '' )
# make function
func = paste('function(x){exp(', k, ') * exp(x*0.01)}', sep = '')
funcs[[funcName]] = eval(parse(text=func))
}
# Specify values
yval = c(1:20)
xval = c(1:20)
# make a dataframe
d = data.frame(xval,yval)
# Specify Range
x_range <- range(1,51)
# make plot
p <-qplot(data = d,
x=xval,y=yval,
xlab = x_label,
ylab = y_label,
xlim = x_range
)+ geom_point(colour="green")
for(j in 1:length(funcs)){
p <- p + stat_function(aes(y=0),fun = funcs[[j]], colour="blue", alpha=I(1/5))
}
# make one function red
p <- p + stat_function(fun = funcs[[i]], aes(color="red"), size = 1) +
scale_colour_identity("", breaks=c("red", "green","blue"),
labels=c("Fitted Values", "Measured values","All values"))
# position legend and make remove frame
p <- p + opts(legend.position = c(0.85,0.7), legend.background = theme_rect(col = 0))
print(p)
提前谢谢你 - 在过去的几天里,我从这个社区学到了很多东西。