yes i is imaginaryunit
plotting lines
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i have a simple ques that if i have z-plane having x and y axes,and i express z=x+i*y,and x if fixed let say 5 any y=0:10 then how can i plot this thing,please guide me,i m waiting for reply
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Mohsen Davarynejad
le 11 Déc 2011
y = [0:.1:10]
plot(5,y)
xlabel('Re')
ylabel('Im')
3 commentaires
Mohsen Davarynejad
le 11 Déc 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
le 12 Déc 2011
z might be a line in the complex plane, but plot(5,y) does not involve z at all, and plot(5,z) would be refused because it is not allowed to plot complex data except through plot(z) which in turn is the same as plot(real(z),imag(z)) -- real vs imaginary.
Walter Roberson
le 11 Déc 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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