Getting Started

Imaginary and Complex Data

When the arguments to plot are complex, the imaginary part is ignored except when plot is given a single complex argument. For this special case, the command is a shortcut for a plot of the real part versus the imaginary part. Therefore,

• plot(Z)
  

where Z is a complex vector or matrix, is equivalent to

• plot(real(Z),imag(Z))
  

For example,

• t = 0:pi/10:2*pi;
  plot(exp(i*t),'-o')
  axis equal
  

draws a 20-sided polygon with little circles at the vertices. The command axis equal makes the individual tick mark increments on the x- and y-axes the same length, which makes this plot more circular in appearance.

Plotting Lines and Markers

Adding Plots to an Existing Graph