How make create 3D plots using piece wise functions?

Question

fofoplitt 2021-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/710628-how-make-create-3d-plots-using-piece-wise-functions

编辑： fofoplitt 2021-1-7

Hello i'm trying to create a 3d plot using a given pice wise function. Same as figure A . Figure B shows an example I took from the website. I was trying to modify the parameters of piece wise but I was a little confuse with domains. Also sorry for the imcomplete question, I acccidentally hit enter before completing the question. This is the first question I ask in this website. Any feedback would be greatly appreciated.

f1 = @(x,y) erf(x)+cos(y);
fsurf(f1,[-5 0 -5 5])% How do you enter the Z domain?
hold on
f2 = @(x,y) sin(x)+cos(y);
fsurf(f2,[0 5 -5 5])
hold off

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Answer 1

Star Strider 2021-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/710628-how-make-create-3d-plots-using-piece-wise-functions#answer_592558

编辑：Star Strider 2021-1-7

在 MATLAB Online 中打开

... rest of your sentence is missing!

Try this:

x = linspace(-5, 5, 50);
y = linspace(0, 10, 50);
[X,Y] = ndgrid(x,y);
Z = @(x,y) x.^2.*((x>= -1) & (x<=3)) + sin(2*pi*y/5).*((y>=-2) & (y<=8));
figure
surf(X, Y, Z(X,Y))
grid on

EDIT — (7 Jan 2021 at 3:54)

This is obviously homework so we give hints rather than solutions.

In that spirit, I suggest that you explore the isosurface function (and its friends).

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fofoplitt 2021-1-7

编辑：fofoplitt 2021-1-7

This is a indeed homework and I already solved the question. I was just trying to include in the figure in latex doc i'm currently working on and learn how to 3d plots in matlab. I'm not trying to solve the question i just want to draw the figure.

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