# plotting lines

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### Answers (3)

Mohsen Davarynejad
on 11 Dec 2011

y = [0:.1:10]

plot(5,y)

xlabel('Re')

ylabel('Im')

##### 3 Comments

Mohsen Davarynejad
on 11 Dec 2011

If z = x + yi, then x is the "real part" and y is the "imaginary part". When x is a constant and y is vector, then you will have line in the complex plane. No?

http://en.wikipedia.org/wiki/Imaginary_number

Walter Roberson
on 12 Dec 2011

Walter Roberson
on 11 Dec 2011

y = 0:10;

x = 5 * ones(size(y));

z = x + i * y;

Now, if "i" were a real-valued constant, you would then use

plot3(x, y, z)

However, "i" is the complex constant, so you have a line in complex space, and there is no way to draw that in one step. Instead you would need to use something like,

plot3(x, y, real(z), 'r', x, y, imag(z), 'g', x, y, abs(z), 'b')

or perhaps plot 3 separate images using subplot()

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