How to create a barplot with several variable

Question

I am very new to R and I am trying to create a barplot with my infiltration on the y axis and burn on the x axis comparing the grazing treatment (example of the data set is below)

Infiltration    Grazing Burn
3301.145496 G   S
8165.771889 U   S
9937.833576 G   L
11576.5892  U   L
32739.07643 G   N
25923.84328 U   N
25942.3     G   C

So far I have produced the code so that it reads the table

   #reads the basic data in
   ana<-read.table("D:\\Dave.txt",head=T)
   attach(ana)
   head(ana)
   dim(ana)

However I do not understand how to write the code to produce a barplot.

I have attached an image of how I produced the graph on excel excel graph

Also I do not have the ggplot, how do I format it as "barplot(....."

Also I do not know how to format the data I added add the top into table - I am aware it reads terribly — BelleT
– BelleT, Commented Feb 8, 2018 at 15:59

Prradep · Accepted Answer · 2018-02-08 16:08:47Z

1

With the sample dataset available, an example could be:

barplot(as.matrix(mtcars[,10:11]), beside = TRUE)

answered Feb 8, 2018 at 16:08

Prradep

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3 Comments

BelleT Over a year ago

what does the [10:11] mean?

Al3xEP Over a year ago

This is matrix notation. [,10:11] means columns 10 to 11 ([10:11,] would mean rows 10 to 11. with the mtcars dataset this means mtcars$gear and mtcars$carb

BelleT Over a year ago

I still do not understand how to write this in the format of my own data

Al3xEP · Accepted Answer · 2018-02-09 07:18:07Z

0

With your dataset and assuming 'ana$burn' is coded as a factor:

barplot(xtabs(ana$Infiltration ~ ana$Burn + ana$Grazing),beside = TRUE)

The beside = TRUE gives your barplot side by side, if you want to stack, put beside = FALSE (just look at the two, see what you prefer).

If 'ana$Burn' and 'ana$Grazing' not coded as factor, you need to add this before:

ana$Burn = as.factor(ana$Burn)
ana$Grazing = as.factor(ana$Grazing)

edited Feb 9, 2018 at 7:18

answered Feb 8, 2018 at 16:28

Al3xEP

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2 Comments

BelleT Over a year ago

thank you. This works however only plots the burn, how do I go about adding the grazing treatment on the barplot ?

Al3xEP Over a year ago

I edited my answer. See if it works for you and accept it if that's the case

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