plotting lines

Question

Muhammad Usman 2011-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/23652-plotting-lines

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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Muhammad Usman 2011-12-12

yes i is imaginaryunit

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Answer 1

bym 2011-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/23652-plotting-lines#answer_31053

在 MATLAB Online 中打开

y = 1:10;
x=5*ones(size(y));
z=x+i*y;
plot(real(z),imag(z))

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Walter Roberson 2011-12-11

That will not be able to show the values of x and y on the axes.

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Answer 2

Mohsen Davarynejad 2011-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/23652-plotting-lines#answer_31054

在 MATLAB Online 中打开

y = [0:.1:10]
plot(5,y)
xlabel('Re')
ylabel('Im')

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

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Mohsen Davarynejad 2011-12-11

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 2011-12-12

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.

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Answer 3

Walter Roberson 2011-12-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/23652-plotting-lines#answer_31056

在 MATLAB Online 中打开

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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Muhammad Usman 2011-12-12

i just tried your code where "i" is complex constant...now i want to ask that how can a draw a rectangle shape and color it on the axes,i.e.let x=0:5 and y=0:7 and these lines meet at(5,7),so guide me.

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