Error on contour plot stability region Runngekutta
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Janvier Solaris
il 10 Nov 2017
Commentato: Walter Roberson
il 11 Nov 2017
Hello I am trying to plot a region of stability of the Runge Kutta 4th order here is the following code in a script
[X,Y] = meshgrid(-5:0.01:5,-5:0.01:5);
Mu = X+i*Y;
R = 1 + Mu + .5*Mu.^2 + (1/6)*Mu.^3 + (1/24)*Mu.^4;
Rhat = abs(R);
contourplot(X,Y,Rhat,[1]);
I get the error that contourplot is an undefined function. the contour plot should look like this :
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/169478/image.jpeg)
Any help would be appreciated
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Walter Roberson
il 10 Nov 2017
contourplot() is not a function defined by Mathworks, and it does not appear to be defined by any File Exchange contributions either.
The contour() routine provided by MATLAB would only draw outlines. The contourf() routine would fill those outlines, but with constant colors, not with a shaded surface like that.
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Walter Roberson
il 11 Nov 2017
I would suggest
surf(X, Y, Rhat, 'edgecolor', 'none');
colormap(gray(256))
lighting gouraud
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