[R] scatter plot of numerical variables against different sample ids

[Shawn Way]

You can also try using ggplot2 to generate the plot:

> library(tidyr)
> library(ggplot2)
> data <- gather(mldf,Element,Value,2:4)
> p <- ggplot(data,aes(x=factor(Element),y=Value,group=Sample,color=Sample))
> p+geom_line()

Shawn Way, PE

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Jim Lemon
Sent: Monday, December 05, 2016 3:02 PM
To: Maria Lathouri <mlathouri at yahoo.gr>
Cc: R-help Mailing List <r-help at r-project.org>
Subject: Re: [R] scatter plot of numerical variables against different sample ids

Hi Maria,
Perhaps something like this:

 mldf<-read.table(text="Sample  Cu  Zn Mn
 M1 1  5  10
 M2  2.5  11   8
 M3 1.15  11  12
 M4  2  4  30
 M5  8  15 35",
 header=TRUE)
 matplot(mldf,type="b",pch=c("C","Z","M"))

Jim


On Mon, Dec 5, 2016 at 11:25 PM, Maria Lathouri via R-help <r-help at r-project.org> wrote:
> Dear all
> I know that my question is very simple but although I tried to find an answer online, I couldn't and I am stuck.
> I have a dataset of three numerical variables measured in different samples ID. Something like this:
> Sample        Cu        Zn        MnM1               1          5          10M2               2.5       11          8M3              1.15      11         12  M4                2         4          30M5                8        15         35
> I would like to plot these variables (Cu, Zn, Mn) (in y-axis) against the Sample ID (in x-axis) in a scatter plot with lines as I want to see how they change in the samples.
> I tried using the command>plot(Sample, Cu, type="l", lty=1, col="red") 
> but I wouldn't get a line. Actually, I would get some small horizontal lines in each point. I tried to use type="p" but I would get the same thing.
> I would very much appreciate if you could help me on that. Apparently, I am missing something.
> Thank you in advance.
> Kind regards,Maria
>         [[alternative HTML version deleted]]
>
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R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.