Computation for the Sciences: Lab 3 :: Precedence, Color and Plotting
Precedence
Here are MATLAB's rules*:
*The table below is adapted from
Mastering MATLAB 7
by Hanselman and Littlefield.
Operator Precedence (from highest to lowest)
- Parentheses ()
- Transpose (.'), conjugate transpose ('), power (.^), matrix power(^)
- Unary plus (+), unary minus (-), negation (~)
- Multiplication (.*), matrix multiplication (*), right division (. /), left division (.\), matrix right division (/), matrix left division (\)
- Addition (+), subtraction (-), logical negation (~)
- Colon operator (:)
- Less than (<), less than or equal to (<=), greater than (>), greater than or equal to (>=), equal to (==), not equal to (~=)
- Element-wise logical AND (&)
- Element-wise logical OR (|)
Reminders:
- Operators of the same precedence are evaluated from left to right
- Precedence can be overridden with parentheses
- Please Excuse My Dear Aunt Sally
I. Practice with Precedence
Evaluate these expressions (by hand!):
- 2 ^ 2 * 4
- 5 + 4 - 3 ^ 2 * 1
- (3 > 4) | (2 < 10) == 1
- alex = (10 == (8 - 6 ) * 5)
- 1 : 4 * 2
- sox = 1 < 1
- sox = 0 < 0.5 < 1
- sox = 2 == 2
II. Using color in plot
Let's extend beyond the 8 built-in MATLAB colors here.
III. Multiple plots in one figure
An example of using subplot.
Prelude to Assignment 2
Assignment 2 contains three Exercises and one extended programming problem.
The Exercises are: 1) practice with conditional expressions, 2) Red Sox statistics
and 3) indexing with colon notation.
Click here for the Exercises.
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