- Section 3.5
- Graphing
- e.g., single points
- Multiple points in lists of x and y coordinates
- Can change markers, colors, line styles
- Can also do bar graphs
- Multiple graphs on same axes
- Can label axes, scales, etc.
- Example
>> % plot a box >> % (1,1), (1,2), (4,1), (4,2) >> x = [1 1 4 4] x = 1 1 4 4 >> y = [1 2 1 2] y = 1 2 1 2 >> plot ( x, y ) % Oops, looks line an "N" not a box >> y = [1 2 2 1]; >> plot ( x, y ) % Better, but the bottom of the box is missing >> x = [ x 1 ] x = 1 1 4 4 1 >> y = [ y 1 ] y = 1 2 2 1 1 >> plot ( x, y ) >> axis( [0 5 0 3] ) >> axis equal
- Describe x and y coordinates on curve as separate functions of
some other variable
- x = x(t)
- y = y(t)
- Example
% Parametric curve x = t^2, y = cos(t) >> t = linspace( 0, pi, 200 ); >> x = t .^ 2; >> y = cos(t); >> plot( x, y );
- Work on plotting lab