Can't understand how to plot real part of Symbolic Function

Question

Omer Sholev 2016-5-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/286182-can-t-understand-how-to-plot-real-part-of-symbolic-function

回答： Walter Roberson 2016-5-28

I'm trying to plot a 3-d graph of the Real part of symbolic function. I have written the code:

syms x real
syms y real
angles = randi([0 360],2,8);
angles = deg2rad(angles);
a = normrnd(0,1,1,8);
a = abs(a);
E = a(1,:).*exp(-1i*K0*(cos(angles(1,:))*x+sin(angles(1,:))*y));
end

And now i want to plot a 3d graph of the real part of the symbolic function E for a range of values of x and y. How can i do that?

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Answer 1

Walter Roberson 2016-5-28

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/286182-can-t-understand-how-to-plot-real-part-of-symbolic-function#answer_223720

在 MATLAB Online 中打开

[X,Y] = ndgrid(linspace(-5,5), linspace(-3,3));    %your x and y range to plot over
Zr = double(real( subs(E, {x,y}, {X,Y})));         %create numeric real values
Zr = reshape(Zr, size(X,1), size(X,2), []);        %E is a vector so each element generated a surface
nsurf = size(Zr,3);
for K = 1 : nsurf
  ax = subplot(1,nsurf,K);
  surf(ax, X, Y, Zr(:,:,K));
  title( char(E(K)) );
end