# How can I plot both a surface and line on the same plot image?

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Richard Jones 2020 年 7 月 14 日

I'll start by saying this is motivated by my interest in complex numbers and analysis. This is something I feel I could do by hand, but as an engineer, it would be handy to know the tools MATLAB can offer to carry out my question.
I am looking for the following:
• 1 plot
• 2 Dimensional function (f = 2*x^2+2*x+2)
• 3 Dimensional surface to plot the complex plane. I intend to use the following video as far as how I imagine plotting the C plane in MATLAB.
Any guidance or direction would be much appreciated. Thank you!
PS: I had to put the version for clarity, but it is implied that the answer doesn't have to be possible in the version I have downloaded.

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### 回答 (1 件)

Anshika Chaurasia 2020 年 8 月 12 日
Hi Richard,
It is my understanding that you want to have a 2-D line and surface plot of f = 2*x^2+2*x+2 in one plot.
You could try following code:
a = -2:0.1:2;
b = -2:0.1:2;
[A,B] = meshgrid(a,b);
Y = 2*(A+1i*B).^2 + 2*(A+1i*B) + 2;
surf(a,b,abs(Y));
hold on;
plot3(a,b*0,2*a.^2+2*a+2,'Color','red','LineWidth',5);
hold off;
Refer to the documentation of plot3, surf and hold for better information on plotting of a surface and line plots in the same figure.

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R2018a

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