These exercises cover the matrices sections of Introduction to R.
Exercise 1
Create a matrix containing information on gene names Gene_1, Gene_2, Gene_3,Gene_4 expression values 1000, 3000, 10000, 12000 and gene lengths 100, 3000, 200, 1000
Update the matrix to contain the expression over the gene length for all genes (Length normalised expression - LNE) as final column.
HINT - We calculated LNE before in vectors exercises’ bonus question
Create a smaller matrix containing genes longer than 200
Create a smaller matrix with just expression and LNE columns containing genes longer than 200 and expression greater than 300
Bonus Question - Calculate the sum of expression and length columns for only genes with length > 100.