[ Closed ] plotting complex numbers

If you want to plot the complex function f(t)=1+i*t with the real part on the x-axis and the imaginary part on the y-axis, you can plot it as the parametric function x(t)=re(1+i*t), y(t)=im(1+i*t). Calculate with complex numbers in the Edit axes dialog must be enabled.

For the second request, I think you can use custom functions. You can for example create the custom functions:

z_re(x, y)=x^2+y^2
z_im(x, y)=2x*y

Now you can create a point series like this:

z_re(5,2), z_im(5,2)
z_re(1,3), z_im(1,3)
z_re(3,2), z_im(3,2)

I know this is not what you hoped for, but I am afraid this is the best that can be done currently.

hi. Would it be possible to include a new feature in the next Graph, specifically to plot a set of complex numbers based on stated expression for teh real and imaginary parts. I include a diagram of what a dialogue box could look like.

The aim would be to type in a complex number z = 1 + 2i, then type in the Re and Im parts of the function you want to map to (say z^2) in the "Re" and "Im" section shown.
Or you could specify a number z = x + 2i, and then specify the range over which you would want all numbers with Im(z) = 2, say specify x = -5 to 5. Then also specify the x step as say 1 (would plot -5 + 2i, -4 + 2i, ..., 4 + 2i, 5 + 2i), or whatever other step. Ditto for y range and y step.
If the mapping z^2 could be plotted on in a new window in Graph that would be nice, otherwise plot the mapping in the same window as z.

chris

hi. I don't know if my reply came thorugh. I am not a programmer so i'd be grateful if you could look into it when you can. At the moment i am using Excel to do all the calculations for z^2 and other functions, then copying the two relevant columns of numbers into "insert point series"

thanks