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Exercise7.R

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+
+#Exercise 7 problem 1
+
+#set working directory
+setwd("~/Desktop/Biocomp_tutorial9-main")
+
+#define wages variable with wages.csv file and define lines variable with number of lines you want to return
+wages<-read.table("wages.csv", header=TRUE, sep=",")
+lines=5
+
+fivelines<-wages[1:lines, ]
+fivelines
+
+#Exercise 7 problem 2
+
+iris<-read.table("iris.csv",header=TRUE,sep=",")
+
+#print the last 2 rows in the last 2 columns to the R terminal
+iris[149:150,4:5]
+
+#get the number of observations for each species included in the data set
+sumspecies<-iris[order(iris$Species, decreasing=TRUE),]
+
+sum(sumspecies$Species=="virginica")
+sum(sumspecies$Species=="versicolor")
+sum(sumspecies$Species=="setosa")
+
+#get rows with Sepal.Width > 3.5
+sw<-(iris[iris$Sepal.Width>3.5,])
+
+sw
+
+#write the data for the species setosa to a comma-delimited file names ‘setosa.csv’
+setosa<-subset(iris, Species=="setosa")
+
+write.csv(setosa, file="setosa.csv", row.names=FALSE)
+
+#calculate the mean, minimum, and maximum of Petal.Length for observations from virginica
+v=iris[iris$Species=="virginica",]
+
+mean(v$Petal.Length)
+max(v$Petal.Length)
+min(v$Petal.Length) 

setosa.csv

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+"Sepal.Length","Sepal.Width","Petal.Length","Petal.Width","Species"
+5.1,3.5,1.4,0.2,"setosa"
+4.9,3,1.4,0.2,"setosa"
+4.7,3.2,1.3,0.2,"setosa"
+4.6,3.1,1.5,0.2,"setosa"
+5,3.6,1.4,0.2,"setosa"
+5.4,3.9,1.7,0.4,"setosa"
+4.6,3.4,1.4,0.3,"setosa"
+5,3.4,1.5,0.2,"setosa"
+4.4,2.9,1.4,0.2,"setosa"
+4.9,3.1,1.5,0.1,"setosa"
+5.4,3.7,1.5,0.2,"setosa"
+4.8,3.4,1.6,0.2,"setosa"
+4.8,3,1.4,0.1,"setosa"
+4.3,3,1.1,0.1,"setosa"
+5.8,4,1.2,0.2,"setosa"
+5.7,4.4,1.5,0.4,"setosa"
+5.4,3.9,1.3,0.4,"setosa"
+5.1,3.5,1.4,0.3,"setosa"
+5.7,3.8,1.7,0.3,"setosa"
+5.1,3.8,1.5,0.3,"setosa"
+5.4,3.4,1.7,0.2,"setosa"
+5.1,3.7,1.5,0.4,"setosa"
+4.6,3.6,1,0.2,"setosa"
+5.1,3.3,1.7,0.5,"setosa"
+4.8,3.4,1.9,0.2,"setosa"
+5,3,1.6,0.2,"setosa"
+5,3.4,1.6,0.4,"setosa"
+5.2,3.5,1.5,0.2,"setosa"
+5.2,3.4,1.4,0.2,"setosa"
+4.7,3.2,1.6,0.2,"setosa"
+4.8,3.1,1.6,0.2,"setosa"
+5.4,3.4,1.5,0.4,"setosa"
+5.2,4.1,1.5,0.1,"setosa"
+5.5,4.2,1.4,0.2,"setosa"
+4.9,3.1,1.5,0.2,"setosa"
+5,3.2,1.2,0.2,"setosa"
+5.5,3.5,1.3,0.2,"setosa"
+4.9,3.6,1.4,0.1,"setosa"
+4.4,3,1.3,0.2,"setosa"
+5.1,3.4,1.5,0.2,"setosa"
+5,3.5,1.3,0.3,"setosa"
+4.5,2.3,1.3,0.3,"setosa"
+4.4,3.2,1.3,0.2,"setosa"
+5,3.5,1.6,0.6,"setosa"
+5.1,3.8,1.9,0.4,"setosa"
+4.8,3,1.4,0.3,"setosa"
+5.1,3.8,1.6,0.2,"setosa"
+4.6,3.2,1.4,0.2,"setosa"
+5.3,3.7,1.5,0.2,"setosa"
+5,3.3,1.4,0.2,"setosa"