R help - Jun 2014 - How to troubleshoot issue with curve() function?

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?

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 <slavrenz at 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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