How could I output several plot and values in R function?

Question

There are several questions:

1 In an R function, "return" only can output one plot or value. But now, I want the function output every plot or vector I require, how could I achieve that. Which code should I use.

2 I have a series of variables : Game1~Game10 and I built up a do loop to analysis each of them where I represented their name as
"paste("Game",i, sep="")",
But it is characters, and I cannot do it like a variable like
"sort(eval(paste("Game",i, sep="")))"
is fail. How could I make R recognize the characters series as a variable name.

For your second question: look at stackoverflow.com/questions/1743698/r-eval-expression (you need to use parse) — Jealie
– Jealie, Commented Apr 8, 2014 at 22:03
@Jealie Thank u so much! But I need some further help. I tried it like : eval(parse(paste("Game",i,sep=""))) There is Game1 in my workfile and it said :"cannot open file 'Game1': No such file or directory " — Chen
– Chen, Commented Apr 9, 2014 at 0:58

Christian Borck · Accepted Answer · 2014-04-08 21:53:26Z

1

to return more than one value from a function, use a data structure, that can store more values and return it, e.g. a vector, list or a dataframe

...
vector_1 <- 1:10
vector_2 <- 11:20
return( list(vec_1=vector_1, vec_2=vector_2) )

to output more than one plot, simply use a loop within the function e.g.

for(i in 5:10) plot(1:i)

Your second question is not clear to me. What are you trying to do?

answered Apr 8, 2014 at 21:53

Christian Borck

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5 Comments

Chen Over a year ago

Like a1<-c(1,2) and How could I represent the number of variable a1 into something like "a"&i. In my loops, I want to represent variable regularly. But R just reads them as characters or strings instead of variable. How could I tell R clearly which is string and which is variable.

Chen Over a year ago

I have added some comment on my question, perhaps these will help u to understand my meaning.

Christian Borck Over a year ago

I think you should try a simpler approach. Instead of pasting togehter numbers and variable names why don't you use a list? E.g.: a <- list() and then for(i in 1:10) a[[i]] <- c(1,2) This gives you the list "a" with a vector element for every loop run...

Chen Over a year ago

Yeah! It is a good way to solve it. Thank you so much! I does offer me a great help!

Christian Borck Over a year ago

You're welcome. If it helped, you can accept my answer or vote it up as beeing useful. Thanks

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