What does meshgrid mean in matlab?
meshgrid is a function in MATLAB (an application software) used to generate grid sampling points. It has a wide range of applications in using MATLAB for 3D graphics rendering.
Function function
Generate the grid data required to draw 3D graphics. When performing drawing operations on a computer, some sampling points are often required, and then the entire graphic is drawn based on these sampling points. When performing 3D drawing operations, three sets of data are involved: x, y, and z. The two sets of data x and y can be regarded as the coordinate pair (x, y)
obtained by sampling the coordinates in the Oxy plane.For example, if you want to draw a 3D graphic in the area of "3<=x<=5, 6<=y<=9, z is not limited to the interval", if you only need integer coordinates as sampling points. We may need a matrix composed of coordinates like the following:
(3,9),(4,9),(5,9); (3,8),(4,8),(5,8); (3,7),(4,7),(5,7); (3,6),(4,6),(5,6);
In matlab, we can describe this coordinate matrix like this:
Independently separate the x coordinates of each point, we get:
3,4,5; 3,4,5; 3,4,5; 3,4,5;
Then separate the y coordinates of each point:
9,9,9; 8,8,8; 7,7,7; 6,6,6;
The corresponding x and y combination represents the above coordinate matrix. Meshgrid generates two matrices like this to simplify our operations. Then calculate z based on (x, y) and draw a three-dimensional graph.
Type type meshgrid in the Matlab command window to view the source code of the function (so you can understand the algorithm idea of meshgrid). Type doc meshgrid or help meshgrid to get the help documentation.
Syntax
[X,Y] = meshgrid(x,y)
Explanation: The value of each row of output X is the copied value of x; the value of each column of output Y is the copied value of y.
[X,Y]=meshgrid(x) is equivalent to [X,Y]=meshgrid(x,x)
[X,Y,Z]=meshgrid(x, y,z) generates a three-dimensional array, which can be used to calculate functions of three variables and draw three-dimensional stereograms
Related functions: plot3, mesh, surf, automesh, ndgrid
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