How to draw three-dimensional graphs in matlab

There are many ways to draw three-dimensional graphics in MATLAB: use the plot3 function to draw line graphs. Use the mesh function to draw mesh surfaces. Use the surf function to draw a colored surface. Use the scatter3 function to draw a scatter plot. Plot a histogram using the histogram3 function.

How to draw three-dimensional graphics in MATLAB

In MATLAB, you can use various functions to draw three-dimensional graphics. Several common methods are listed below:

1. Use the plot3 function

plot3 function for plotting 3D line graph. It accepts three vectors as input, representing x, y and z coordinates respectively:

<code class="matlab">x = [1, 2, 3];
y = [4, 5, 6];
z = [7, 8, 9];
plot3(x, y, z);</code>

2. Use the mesh function

The mesh function is used to draw a three-dimensional mesh surface. It accepts two matrices as input, representing the x and y coordinates respectively:

<code class="matlab">[X, Y] = meshgrid(linspace(-2, 2, 100));
Z = X.^2 + Y.^2;
mesh(X, Y, Z);</code>

3. Use the surf function

surf Function is similar to the mesh function, but draws a colored surface. It accepts as input three matrices representing x, y and z coordinates, and one matrix representing color:

<code class="matlab">[X, Y] = meshgrid(linspace(-2, 2, 100));
Z = X.^2 + Y.^2;
C = Z;  % 使用 Z 作为颜色
surf(X, Y, Z, C);</code>

4. Using the scatter3 function

scatter3 The function is used to draw a three-dimensional scatter plot. It accepts three vectors as input, representing x, y and z coordinates respectively:

<code class="matlab">x = rand(100, 1);
y = rand(100, 1);
z = rand(100, 1);
scatter3(x, y, z);</code>

5. Using the histogram3 function

The histogram3 function is used to draw a three-dimensional histogram and display the distribution of data:

<code class="matlab">data = randn(1000, 3);
histogram3(data, 'NumBins', 10);</code>

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