simple complex plot of a few points

All i want to do is plot a few points on a complex plot aka the S Plane

If i want to plot a single point at say -2 + 2*sqrt(3)*j how would i go about doing such a thing.

Answer 1

[KSSV]

z = -2 + 2*sqrt(3)*i ;
 plot(z,'.r') ;

or

plot(real(z),imag(z),'.r') ;

Read: http://in.mathworks.com/help/matlab/creating_plots/plot-imaginary-and-complex-data.html

[Robert]

This i not showing me that its complex Its just on a regular plane with no label of i or j for the imaginary axis which does me no good and is really the same as plotting -2+2*sqrt(3)

[Star Strider]

KSSV is correct.

You should actually be plotting:

z = [-2 + 2*sqrt(3)*j; conj(-2 + 2*sqrt(3)*j)];

because complex quantities always appear in complex-conjugate pairs.

By convention, the real axis is the x-axis and the imaginary axis is the ±y axis. (Positive real parts indicate an unstable system, so the positive part of the x axis is characteristically not plotted.)

[Robert]

i need the y axis to actually show the dang i or j

[KSSV]

    plot(real(z),imag(z),'.r') ; 
    xlabel('Real part')
    ylabel('Imaginary part')x

[Star Strider]

‘i need the y axis to actually show the dang i or j’

See the documentation for text.