On Jul 27, 2011, at 3:01 AM, dean123 wrote:
I am trying to plot the following function over the range 0-100
test <- function(t){{
if (t<=10)
x<-t*0
else x<-2*t
}
x
}
Two problems I see. The first is the one described fairly clearly by
the error message:
Read:
?"if"
It is not designed to handle vectors.
You most certainly should read:
?ifelse
when I use plot(test,0,100) the GUI produces the following;
The second is that you have created a function to which you have
offered no arguments. Typing plot(test, 0, 100) is not passing any
arguments to 'test'. It is giving test, 0, and 100 to 'plot' and since
they are unnamed you are futher expecting R to associate test with x,
0 with y and 100 with whatever the third argument plot might be. (You
should look it up.)
?plot
You need to learn to form you commands as
function_name(arg_name=arg_value, ...) and realize that function calls
can also be arguments so once you have a working 'test' it might be
successful to use this
plot( seq(100), test(seq(100) )
See read more of Introduction to R and work all the examples.
--
David.
"Warning message:
In if (t <= 10) x <- t * 0 else x <- 2 * t :
the condition has length > 1 and only the first element will be used"
I am confused as when I evaluate the function for individual t it
gives the
correct response i.e. 0 for t<=10 and 2*t for t>10... This is what I
wish
the function to do however, I am not able to plot the function.
Any help would be most appreciated!
--
View this message in context:
http://r.789695.n4.nabble.com/Plotting-a-function-that-includes-logical-operators-tp3697732p3697732.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
