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Practical 2: Variables, Script M-files and Graphing

Naming of Numerical Values in MATLAB

Using Variables

Consider the polynomial function y=x^{2}+4x+3 to be calculated for various x values.

> Type in x^2 + 4x + 3 to set the value of x equal to 3 and then evaluate the value of the polynomial y.

Warning: The above code contains an error that is commonly made by learners.

> What is the error?

> Change the value of x to evaluate the polynomial for x = 5 and 7. You will need to re-run the command to solve the polynomial each time you update x.
wink Coding Reminder: The up-arrow on the keyboard will recall a previous line for you to edit.