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Calculate σx for ri = 1 cm
Remember elementary statics? It gives the bending stress at point O as
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Using my calculator, I get σx=-101.7 MPa. We'll check the MATLAB result against this value.
Calculate σx at point O
In your program, leave a blank line and start a new section for calculating σx at point O with an explanatory comment line. Then, create the parameters M, ro, and ri since these are needed to calculate σx.
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This is close enough to my paper-and-pencil result of -101.7 MPa above. See my entire program here (right click and select save target as, or just left-click and copy-paste in the editor).