Order of data in plots

[David Doyle]

Hi folks,

I was wondering if there is a way to control the order my data plots in the graph.

This is a statistical review of groundwater data from wells.  It is plotting the well in the order of their IDs.  ie. MW1B then MW3B then MW4A.....

I would like to have it do MW1B then WES-14-4-93 then ........

Is there a way I can control this??  

My data / code is below.

Thank you for your time

David Doyle

library(ggplot2)

MS <- read.table("http://www.doylesdartden.com/R/MS.csv", header=TRUE, sep=",",)

#Sets whic are detections and nondetects

MS$Detections <- ifelse(MS$D_AMMONIA==1, "Detected", "NonDetect")

#does the plot

p <- ggplot(data = MS, aes(x=Year, y=AMMONIA, col=Detections)) +

  geom_point(aes(shape=Detections)) +

  

  ##sets the colors

  scale_colour_manual(values=c("black","red")) +

  

  #location of the legend  

  theme(legend.position=c("none")) +

  

  #sets the line color, type and size

  geom_line(colour="black", linetype="dotted", size=0.5) + 

  ylab("Ammonia (mg/L)") +

  ##Graph title

  ggtitle("Lower Mudstone Ammonia Time Sereis")

## does the graph using the Well IDs as the different wells.

p + facet_grid(Well ~ .)

[Brandon Hurr]

Use factor() to set the order of your levels for Well. 

[Brandon Hurr]

library(ggplot2)

MS <- read.table("http://www.doylesdartden.com/R/MS.csv", header=TRUE, sep=",",)

#Sets which are detections and nondetects

MS$Detections <- ifelse(MS$D_AMMONIA==1, "Detected", "NonDetect")

#reorder factor levels for plotting

MS$Well <- factor(MS$Well, levels = c("MW1B","WES-14-4-93","MW3B","MW4A","MW5B","MW6B") )

#does the plot
p <- ggplot(data = MS, aes(x=Year, y=AMMONIA, col=Detections)) +
  geom_point(aes(shape=Detections)) +
  ##sets the colors
  scale_colour_manual(values=c("black","red")) +
  #location of the legend  
  theme(legend.position=c("none")) +
  #sets the line color, type and size
  geom_line(colour="black", linetype="dotted", size=0.5) +
  ylab("Ammonia (mg/L)") +
  ##Graph title
  ggtitle("Lower Mudstone Ammonia Time Sereis")

## does the graph using the Well IDs as the different wells.
p + facet_grid(Well ~ .)

[Dennis Murphy]

This is the same question you posted to R-help, and it's not the first
time. Please don't cross-post unless you have a question that is
specific to ggplot2. (The same applies to cross-posting to Stack
Overflow.) David Winsemius provided a reasonable answer to your
question by suggesting that you order the factor levels prior to
calling a plot routine, and the same advice would hold for ggplot2, as
Brandon noted.

Dennis

On Mon, Oct 27, 2014 at 6:04 PM, David Doyle <kydavi...@gmail.com> wrote:

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[David Doyle]

Hi Dennis,

I apologize.  I had posted the question regarding my time vs. concentration here because I had used ggplot2 for those graphs and the question in R-Help was regarding the box plots which did not use ggplot2.  I thought there might a different requirement for them being the one was using ggplot2.

Thank you for your time

David Doyle