Plotting a multivariable function

Question

Katarina Djurovic 2020-12-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/704222-plotting-a-multivariable-function

回答： Image Analyst 2020-12-29

I want to plot function f(x,y)=1/(x*y), but my code doesn't seem to work

x=[-3,0.1,3];

y=[-3,0.1,3];

[X,Y]=meshgrid(x,y);

Z=1./(X*Y);

surf(X,Y,Z)

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Answer 1

Image Analyst 2020-12-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/704222-plotting-a-multivariable-function#answer_586092

在 MATLAB Online 中打开

You can do

% Original spacing
x=[-3,0.1,3];
y=[-3,0.1,3];
[X,Y]=meshgrid(x,y);
Z = 1 ./ (X .* Y);
subplot(2, 1, 1);
surf(X,Y,Z);
xlabel('X', 'FontSize', 20);
ylabel('Y', 'FontSize', 20);
zlabel('Z', 'FontSize', 20);
colorbar;

but you are WAY undersampling this function to see the results, which essentially goes to infinity at X and Y both = 0.

% More fine spacing:
subplot(2, 1, 2);
numPoints = 700;
x = linspace(-3, 3, numPoints);
y = linspace(-3, 3, numPoints);
[X, Y] = meshgrid(x,y);
Z = 1 ./ (X .* Y);
surf(X,Y,Z, 'LineStyle', 'none');
xlabel('X', 'FontSize', 20);
ylabel('Y', 'FontSize', 20);
zlabel('Z', 'FontSize', 20);
colormap(jet);
colorbar;
xlim([-.05,.05]);
ylim([-.05,.05]);
zlim([-300, 1200]);