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Essentially, we need to repeat our previous calculation of σ_x at O for a range of r_ivalues. One way to do this is to loop over the previous calculation. Let's check the documentation to see what MATLAB provides for loops.

Help > Index (tab)

Search for loops.

Documentation

There are two types of loops: for and while. Bring up the documentation for the for loop and look Enter for loop in the search bar and then select for which is the first entry up top. Look at the first example. This shows the format of the for loop. It is noted on this page that " You can often speed up the execution of MATLAB code by replacing for and while loops with vectorized code". That is what we'll do in Step 4. Let's stick it out with slowpoke for loop for now.

We'll create a new M-script file from beam.m and implement the for loop in that file.

Editor (tab) > File Save > Save As

Enter beam2.m for filename. Confirm that you are editing beam2.m (beam.m remains intact).

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