Multiple line graphing in R

[Shittu, Aminu]

Dear ggplotters,

For a beginner practising multiple line plotting in R, using the below few data. Included below the data is the desired graph output, created in Microsoft Excel.

Days	Mussel(pH)	Water(pH)
D4	6.3	6.6
D7	6.73	7.3
D9	6.47	6.94
D11	6.47	6.94
D14	6.7	6.83

Days (xlab) while pH(ylab).

I expected to have something like below in R.

Please advise.

Aminu

[Dennis Murphy]

Hi:

First of all, please learn how to post data to the group. The preferred mode is dput() form, as in

> dput(DF)

structure(list(Day = c(4L, 7L, 9L, 11L, 14L), Mussel = c(6.3, 

6.73, 6.47, 6.47, 6.7), Water = c(6.6, 7.3, 6.94, 6.94, 6.83)), .Names = c("Day", 

"Mussel", "Water"), class = "data.frame", row.names = c(NA, -5L

))

It makes more sense to use the actual numeric days than factor levels, so I edited your data so that days were numeric (i.e., the D was removed). You then want to melt the data so each variable can be plotted separately, after which you can pass it into ggplot2.

DF <- read.table(header = TRUE, text = "

Day Mussel Water

4    6.3  6.6

7    6.73 7.3

9    6.47 6.94

11   6.47 6.94

14   6.7  6.83")

library(reshape2)

DFm <- melt(DF, id = "Day")

library(ggplot2)

ggplot(DFm, aes(x = Day, y = value, color = variable)) +

   theme_bw() + 

   geom_line(size = 1) + geom_point(size = 2.5) +

   labs(x = "Day of analysis", y = "pH", color = "")

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[Shittu, Aminu]

Hi Dennis,

Thank you very much!

Aminu.