r limma how to construct contrast matrix what is the contrast matrix what is the comparison between genotype and genotype in r what consists of the genotype and the genotype how do I create a contrast matrix for genotypes? how to construct a contrast matrix in r? r how to create contrast matrix why is the contrast matrix used in r which is a factorial contrast matrix? which factor is a genotype how to construct a contrast matrix in two factorials how to make contrast matrix what type of matrix is a limma how to create a contrast matrix in r limma r definition what is the contrast matrix what is the genotype for the genotype what is the matrix for genotypes what is the limma matrix how to construct a contrast matrix?