Plot different colors using for loop

Question

I'm new in R and I have been trying to plot 4 exponential curves with different colors. I want to know how to do it with a for loop.

par(mfrow = c(2, 2))
colors<-rainbow(4)
parameters <- c(10, .25, 1, 6)
for(lambda in parameters){ 
curve(dexp(x, lambda), 0, 3, main = bquote(lambda ==.(lambda)),
font.main = 1, xlab = "x", ylab = "f(x)",col=colors[lambda])
}

similar to the answer below for(ii in seq_along(parameters)) {lambda <- parameters[ii]; curve(dexp(x, lambda), 0, 3, main = bquote(lambda ==.(lambda)), font.main = 1, xlab = "x", ylab = "f(x)",col=colors[ii])} — rawr
– rawr, Commented Feb 3, 2021 at 19:47

Brian Davis · Accepted Answer · 2021-02-03 19:29:51Z

1

You were passing your parameter values to index your color object. Generally it's good practice to use 1:n integers in your for loops.

Try this:

for(lambda in seq_along(parameters)){ 
   curve(dexp(x, parameters[lambda]), 0, 3, main = bquote(parameters[lambda] ==.(parameters[lambda])),
         font.main = 1, xlab = "x", ylab = "f(x)",col=colors[lambda])
}

edited Feb 3, 2021 at 19:29

answered Feb 3, 2021 at 19:13

Brian Davis

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