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Hakan Ole Ensrud Abediy
评论： Walter Roberson 2019-8-16
Hey, I have following function
x = linspace(-0.5,0.5);
y = linspace(-0.5,0.5);
[X,Y] = meshgrid(x,y);
V = 4*(((exp(-20*(((X-0.25)^2) + (Y-0.25)^2)))) + exp(-20*(((X-0.25)^2 + (Y-0.75)^2))) + exp(-20*(((X-0.75)^2 + (Y-0.5)^2))));
figure
contour(X,Y,V,'ShowText','on')
I want to display the function text so I can debug, because Matlab only outputs arrays with zeros. So something is wrong with how I typed in the function.
i.e
Is this possible in MATLAB 2016b?
Thank you
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回答（2 个）

Walter Roberson
Walter Roberson 2016-9-24
Your bug is that you used the ^ operator instead of the .^ operator. For a square matrix Z, Z^2 is Z*Z, the matrix algebraically multiplied by itself, whereas you want Z.*Z, which is each element multiplied by itself.
shegaw mamo
shegaw mamo 2019-8-16
function dx = cancerhealthcells(~, x)
dx = [2; 1];
L=15;
ommega=50
alpha1 = 0.1;
alpha2 = 0.45;
kappa1 = 0.65;
kappa2 = 1;
beta1 = 0.11;
beta2 = 0.15;
epsilon = 0.05;
gamma = 0.35;
dx(1) = alpha1*x(1)-alpha1*x(1).^2./kappa1-beta1*x(1)*x(2)-epsilon*gamma*x(1);
dx(2) = alpha2*x(2)-alpha2*x(2).^2./kappa2-beta2*x(1)*x(2)-gamma*x(2);
Question: Ommega and L are not in the system of equation. How we can develop matlab syntax including ommega and L using ode45?

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