Learn How to Graph 3D in MATLAB

[Dell]

i am learning MATLAB, but have not yet learned anything do do with graphing, but need a program that can plot x.y.z graphs for my calculus work,

can someone please help me plot 3d graphs on MATLAB, for example

z=x²+2x+y²-y

how can i input x,y,z so that MATLAB will give me the surface graph of this function

 

[n0_3sc]

Modify as you need:

[X Y] = meshgrid(linspace(-10,10));
z=X.^2+2.*X+Y.^2-Y;
mesh(X,Y,z)

Alternatively use "surf" instead of "mesh".

 

[oswaler]

Hi there,

I would be happy to help you learn how to graph 3D in MATLAB. First, let's go over the basics of creating a 3D plot in MATLAB. You will need to have a set of x, y, and z values to plot. In your example, the z values are determined by the equation z=x^2+2x+y^2-y. To plot this, you will need to create a grid of x and y values and then use the equation to calculate the corresponding z values.

To create a grid of x and y values, you can use the meshgrid function in MATLAB. This function takes in two vectors of x and y values and creates a grid of points. For example, you can use the following code to create a grid of x and y values from -5 to 5 with a step size of 0.5:

[x, y] = meshgrid(-5:0.5:5);

Next, you will need to calculate the z values using the equation you provided. You can do this using element-wise operations in MATLAB. For example, you can use the following code to calculate the z values for each point in the grid:

z = x.^2 + 2.*x + y.^2 - y;

Now that you have your x, y, and z values, you can use the surf function in MATLAB to create a 3D surface plot. The surf function takes in three matrices of x, y, and z values and creates a surface plot. You can use the following code to plot the function you provided:

surf(x, y, z);

This will create a 3D surface plot of the function z=x^2+2x+y^2-y. You can also customize your plot by adding labels, changing the color and style of the surface, and adding a color bar for a better visualization.

I hope this helps you get started with graphing 3D functions in MATLAB. Keep practicing and exploring different functions and features in MATLAB to improve your skills. Good luck!