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

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Omer Sholev on 28 May 2016
Answered: Walter Roberson on 28 May 2016
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);
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?

Walter Roberson on 28 May 2016
[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

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