I’d start trying to understand the error message - it is actually pretty clear
(see ?curve).
I suspect curve is not the function you want to use, rather something like
plot(data$arrival_time, dexp(data$arrival_time, rate=0.06), xlim = c(0, 60),
type=‘l’, main = "Exponential distribution”)
assuming your arrival times lie in the specified window.
Just a wild guess though, as you didn’t provide data (see footer)
On 25 Jun 2014, at 23:02 , Lavrenz, Steven M <slavr...@purdue.edu> wrote:
> I am trying to plot data that I imported with read. table using a Weibull
> distribution. Here's the code I used for importing the data:
>
> data <- read.table(file =
> "C:/Users/Steven/OneDrive/Unfiled/Temp/phase2.csv", header = FALSE, sep =
> ",", dec = ".", col.names = c("cycle_time", "cycle_length", "red_time",
> "prot_green", "perm_green", "veh_count", "vc", "max_delay", "prot_occ",
> "perm_occ", "red5_occ", "gor", "ror", "arrival_time"), na.strings = "NA")
>
> And here's my code for plotting:
>
> curve(dexp(data(arrival_time), rate=0.06), from = 0, to = 60, main =
> "Exponential distribution")
>
> I keep getting this error message:
>
> Error in curve(dexp(data(arrival_time), rate = 0.06), from = 0, to = 60, :
> 'expr' must be a function, or a call or an expression containing 'x'
>
> How to I begin to troubleshoot this? The only thing I can think of is that my
> variable of interest, "arrival_time", does contain a number of rows with
> blanks, but would that be the underlying cause? If so, can I get the function
> to ignore blank rows?
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>
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