Thanks a lot to you both.
Both solutions work great, and thanks to will for explaining how this
works. I will have a look into while and if statements in R tomorrow...
2013/9/18 William Dunlap [via R] <ml-node+s789695n4676466...@n4.nabble.com>
> > If I have this:
> >
> > "names" <- c("John", "Jim", "Mary", "Susan")
> > "age" <- c(16, 25, 32, 56)
> > "income" <- c(2000, 3000, 2500, 1500)
> > "all"<- data.frame(names, age, income)
>
> First, things will be easier for you if you make that dataset as
> all <- data.frame(
> names = c("John", "Jim", "Mary", "Susan"),
> age = c(16, 25, 32, 56),
> income = c(2000, 3000, 2500, 1500))
> so you don't have two things called "names", etc., one in the data.frame
> and one in the current environment.
>
> You can select subsets in R using the "[" operator. If it is given an
> integer
> argument it gives you the items indexed by that that integer vector; if
> given a logical argument it gives you the items corresponding to TRUE's
> in that logical vector. E.g., try
> x <- c(11,22,33,44)
> x[c(1,3)] # gives 11 and 33
> x[c(TRUE, FALSE, TRUE, FALSE)] # also gives 11 and 33
>
> Make a logical vector of showing which items in 'income' are equal to
> its maximum with
> atMaxIncome <- max(all$income) == all$income # gives, FALSE TRUE FALSE
> FALSE
> and do the selection with
> all[ atMaxIncome, ]
>
> > I tried some if-statements, but they didn't work because my programming
> > skills outside of SQL are basically non-existent.
>
> All of this is in Chapter 2 of "An Introduction to R" (about 4 pages into
> it), which comes with R.
> Read it and do the examples and your R programming skills will improve.
>
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com
>
> > -----Original Message-----
> > From: [hidden
> > email]<http://user/SendEmail.jtp?type=node&node=4676466&i=0>[mailto:[hidden
> email] <http://user/SendEmail.jtp?type=node&node=4676466&i=1>] On Behalf
> > Of Hal_V
> > Sent: Wednesday, September 18, 2013 12:43 PM
> > To: [hidden email]<http://user/SendEmail.jtp?type=node&node=4676466&i=2>
> > Subject: [R] How to find values that correspond to a given value (i.e.
> max)
> >
> > Hi everyone
> > I'm new to R, so this is probably a stupid question, but I looked around
> for
> > quite a while an couldn't find an answer. Basically I'm trying to print
> > values that correspond to a found maximum.
> >
> > If I have this:
> >
> > "names" <- c("John", "Jim", "Mary", "Susan")
> > "age" <- c(16, 25, 32, 56)
> > "income" <- c(2000, 3000, 2500, 1500)
> > "all"<- data.frame(names, age, income)
> > max(all$income)
> >
> > I would like to print the name and age that correspond to the found
> maximum.
> > I tried some if-statements, but they didn't work because my programming
> > skills outside of SQL are basically non-existent.
> >
> > I'd be glad for any pointers, thanks
> >
> >
> >
> > --
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> > Sent from the R help mailing list archive at Nabble.com.
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