Looping for ggplot how to use the for loop variable i inside the loop

Question

I have a dataframe (what is the dataframe? i,e is not important). I am using that and plotting some point curves. like below

#EXP <- 3 (example)
#EXP_VEC <- c(1:EXP)

for (i in 1:EXP)
{
gg2_plot[i] <- ggplot(subset(gg2,Ei == EXP_VEC[i] ),aes(x=hours, y=variable, fill = Mi)) + geom_point(aes(fill = Mi,color = Mi),size = 3)
}

As you can see EXP_VEC = c(1,2,3.......) (Depends on user input Ex: if user inputs 2 then EXP_VEC = c(1,2))

Dataframe has Ei = 1,2,3,4,........

Now I have to do the plotting for all these Ei values depending on the user input.

Consider, EXP_VEC=3 now the for loop should produce three plots for Ei = 1 , Ei = 2 and Ei = 3 for this if the for loop I have written works then it would have been done and finished.

But obviously for loop is not working. I cant use aes_string because variable "i" is outside the aes().

Ex: consider the following dataset

dd<-data.frame(
    Ei = c(1L, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2), 
    Mi = c(1, 1, 1, 2, 2, 2, 1, 1, 1, 2, 2, 2), 
    hours = c(1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3), 
    variable = c(0.1023488, 0.1254325, 0.1523245, 0.1225425, 0.1452354, 
    0.1853324, 0.1452369, 0.1241241, 0.0542232, 0.8542154, 0.021542, 
    0.2541254))

As you can see I have two sets of Ei, I want to plot 1st plot for Ei = 1 and then beside this plot I want to again plot for Ei = 2.

So I thought of saving the plots for Ei=1 and Ei=2 in two separate variables and then using then in some kind of cascade function which I am yet to find out. How do I do it?

Is there a easy way to do this by just using ggplot without any loop? If not then how can I call "i" value inside my for loop?

You use a for loop, but you also have i=i+1 at the end of each loop. I assume this is not indented. — Max Candocia
– Max Candocia, Commented May 19, 2014 at 23:59
Would you mind to provide some data? And you need a list of plots? — Paulo E. Cardoso
– Paulo E. Cardoso, Commented May 20, 2014 at 0:17

agstudy · Accepted Answer · 2014-05-20 00:28:20Z

2

I would do something like this:

plot_exp <- 
  function(i){
    dat <- subset(gg2,Ei == i )
    if (nrow(dat) > 0)
       ggplot(dat,aes(x=hours, y=variable, fill = Mi)) + 
              geom_point(aes(color = Mi),size = 3)
  }

ll <- lapply(seq_len(EXP), plot_exp)

ll is a list of plot of ggplot objects.

answered May 20, 2014 at 0:28

agstudy

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4 Comments

cppiscute Over a year ago

Extremely Helpful. Thank You. Any Idea on displaying those ggplot objects inside ll in the layout manner. (Just like one after the other) (Both... real time display on screen and through PDF)

Paulo E. Cardoso Over a year ago

@statisticalbeginner something like this

cppiscute Over a year ago

I tried with grid.arrange but its not working any idea on this one? > grid.arrange("ll[1]","ll[2]",tableGrob(head(iris)), nrow=2, as.table=TRUE, main="test main",sub=textGrob("test sub", gp=gpar(font=2))) Error in arrangeGrob(..., as.table = as.table, clip = clip, main = main, : input must be grobs!

cppiscute Over a year ago

Find the solution to the above problem with do.call function. pdf("foo.pdf") plot_exp <- function(i){ dat <- subset(gg2,Ei == i ) ggplot(dat,aes(x=hours, y=variable, fill = Mi)) + geom_point(aes(color = Mi),size = 3) } ll <- lapply(seq_len(EXP), plot_exp) do.call(grid.arrange, ll) dev.off() Still working on Labels and Legends though....thanks anyway..:)

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