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+###Exercise 7 Script 
+###Marlee Shaffer
+
+##Part 1: Replicate the functionality fo the head function in bash 
+headR<-function(filename,linenum){
+  file<-read.csv(filename)
+  return(file[1:linenum,])
+}
+
+#To check to make sure the newly developed function works properly, I used the wages.csv to pull the first 16 rows.
+headR("wages.csv", 16)
+
+#Part 2: Use iris.csv to: 
+iris<-read.csv("iris.csv")
+
+#Print the last 2 rows and the last two columns to the R terminal
+T<-tail(iris[,4:5],2)
+print(as.data.frame(T),row.names=FALSE)
+
+#Get the number of observations for each species in the data set
+X<-sum(iris[,5]=="virginica")
+Y<-sum(iris[,5]=="setosa")
+Z<-sum(iris[,5]=="versicolor")
+data.frame(Species=c("Virginica:", "Setosa:", "Versicolor:"),Observations=c(X, Y, Z))
+
+#Get rows with Sepal.Width > 3.5
+sepal<-(iris[iris$Sepal.Width>3.5,])
+print(sepal)
+
+#Write the data for species setosa to a comma-delimited file named 'setosa.csv'
+setosa<-(iris[iris$Species=="setosa",])
+write.csv(setosa, 'setosa.csv')
+
+#Calculate the mean, minimum, and maximum of Petal.Length for observations from virginica
+df = iris
+Mean<-mean(df$Petal.Length)
+Min<-min(df$Petal.Length)
+Max<-max(df$Petal.Length)
+data.frame(Measurement=c("Mean Petal Length", "Minimum Petal Length", "Maximum Petal Length"),Value=c(Mean,Min,Max))
+