SUNY Geneseo Department of Mathematics

Introduction to Plotting

Friday, September 26

Math 230 01
Fall 2014
Prof. Doug Baldwin

Questions?
Plotting in Matlab
- Section 3.5 + “Parametric Curves” video
  - Reading
    - How to plot
    - plot function: save x and y in variables
    - plot a single point?
    - x and y vectors to plot curves
    - plot( x, y )
    - Can control color, line type; see list of options in book, page 90
  - Parametric curves
    - Way to plot non-function by describing x and y as functions of t
- Code examples, arising while working on plotting lab
```
% Plot a simple function:
x = linspace( -3, 3 );
y = 4 - x .^ 2;
figure;
plot( x, y );
% Or...
x = -3:3;
y = 4 - x .^ 2;
plot( x, y );
% Plot a circle:
t = linspace( 0, 2*pi, 200 );
x = cos(t);
y=sin(t);
plot(x,y)
axis equal;
```
Next
- Designing and testing programs
- “ Designing and Testing Programs” video at https://cloud.ensemblevideo.com/app/sites/index.aspx?destinationID=IlO-D-b-vUWVkAsj2Is5Zg&contentID=pVmgi6VG0Umu4m4-qx2Eag&pageIndex=1&pageSize=10