1 Element-wise Calculation

In RStudio matrices can be thought of as a structured collection of information. In the first workshop you were introduced to vectors as a collection of data that enabled you to perform the same calculation on each value. Likewise, we can treat matrices in a similar manner. Using the matrices defined in the introduction, type and execute the following commands that perform element-wise commands:

E+1

B-A

5*C

3 - D/2

A*B

exp( D )

sqrt( B )

cos( pi*E )

asin( 1/C )

A^2

Note that the last command in each column are performed element-wise and are not matrix multiplication. Therefore, RStudio executes these commands like this:

The element-wise calculations can only be performed when the dimensions of two matrices are identical. Performing the calculation C*D will produced the error message Error in C * D : non-conformable arrays.