Multiplication by columns:

Use the : operator to extract the first, second and third column of the matrix S and store them in the variables s$1,$ s$2$ and s$3$ respectively $($do not try to enter the single entries of the columns individually$).$

Compute the products R$*$s$1,$ R$*$s$2,$ R$*$s$3$ and store them in the varibles c$1,$ c$2,$ c$3$ respectively.

Build the matrix C with columns c$1,$ c$2$ and c$3($Note: build the matrix by concatenating the columns, do not enter the single entries individually$)$

$2.$ Multiplication by rows:

Use the : operator to extract the first, second and third rows of the matrix R and store them in the variables r$1,$ r$2$ and r$3$ respectively $($do not try to enter the single entries of the rows individually$)$

Compute the products r$1*$S$,$ r$2*$S$,$ r$3*$S and store them in the variables m$1,$ m$2,$ m$3$ respectively.

Build the matrix M with rows m$1,$ m$2$ and m$3($Note: build the matrix by concatenating the rows, do n