\[A=\left[\begin{align}& a_{11}\space\space a_{12}\space\space a_{13}\\& a_{21}\space\space a_{22}\space\space a_{23}\end{align}\right]\] The elements are the entries ...
We can also combine two vectors into a single vector using the `c()` function: amino_acids_matrix[1, 2] # Accesses the first row, second column amino_acids_matrix[4, 3] # Accesses the fourth row, ...
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