When the arguments to plot are complex (i.e., the imaginary part is nonzero), All MATLAB® graphics functions ignore the imaginary part except when plot is given a single complex data argument. For this special case, the command produces a plot of the real part versus the imaginary part. Therefore,
where Z is a complex vector or matrix, is equivalent to
For example, this statement plots the distribution of the eigenvalues of a random matrix using circular markers to indicate the data points.
To plot more than one complex matrix, there is no shortcut; the real and imaginary parts must be taken explicitly.