ELG 3120 Lab 2

1
ELG 3120 Lab 2

• TAs
• Wei Zhang Ozgur Ekici
• (Section A) (Section B)

2
Plotting functions
3

• Line Plots of 3-D DataThe 3-D analog of the plot
  function is plot3. If x, y, and z are three
  vectors of the same length,
• plot3(x,y,z)
• generates a line in 3-D through the points
  whose coordinates are the elements of x, y, and z
  and then produces a 2-D projection of that line
  on the screen.

4

• Setting the Viewpoint with Azimuth and
  ElevationAzimuth and Elevation
• The view command specifies the viewpoint by
  defining azimuth and elevation with respect to
  the axis origin. Azimuth is a polar angle in the
  x-y plane, with positive angles indicating
  counter-clockwise rotation of the viewpoint.
  Elevation is the angle above (positive angle) or
  below (negative angle) the x-y plane.

5
(No Transcript)
6

• Axis Labels and Titles
• The xlabel, ylabel, and zlabel commands add x-,
  y-, and z-axis labels. The title command adds a
  title at the top of the figure.
• Example
• xlabel(second')
• ylabel('sin(t)')
• title('Graph of the sine function')

7

• Setting Axis Limits
• By default, MATLAB finds the maxima and minima of
  the data to choose the axis limits to span this
  range.
• The axis command enables you to specify your own
  limits
• axis(xmin xmax ymin ymax)
• or for three-dimensional graphs,
• axis(xmin xmax ymin ymax zmin zmax)
• Use the command
• axis auto
• to reenable MATLAB automatic limit selection.

8

• Multiple Plots in One Figure
• The subplot command enables you to display
  multiple plots in the same window or print them
  on the same piece of paper. Typing
• subplot(m,n,p)
• partitions the figure window into an m-by-n
  matrix of small subplots and selects the pth
  subplot for the current plot. The plots are
  numbered along first the top row of the figure
  window, then the second row, and so on. For
  example, these statements plot data in four
  different subregions of the figure window.

9

• Example
• t 0pi/102pi
• X,Y,Z cylinder(4cos(t)) subplot(2,2,1)
• mesh(X)
• subplot(2,2,2)
• mesh(Y)
• subplot(2,2,3)
• mesh(Z)
• subplot(2,2,4)
• mesh(X,Y,Z)