MATLAB 3D drawing Summary

1. Draw a 3D graph of the function, for example, Z (x, y) = 2 * X. * exp (-X. ^ 2-y. ^ 2) + 1;

Close all; [x, y] = meshgrid (-2: 0.. 5:2); % generate coordinate axis Z = 2 * X. * exp (-X. ^ 2-y. ^ 2) + 1; % Z is X, function % of Y % num = 0; num = num + 1; subplot (2, 3, num); plot3 (x, y, z); axis ([-3 3 3-3 0 2]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (1 )'); % title % % num = num + 1; subplot (2, 3, num); mesh (x, y, z); axis ([-3 3-3 3 0 2]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (2 )'); % title % % num = num + 1; subplot (2, 3, num); meshc (x, y, z); axis ([-3 3-3 3 0 2]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (3 )'); % title % % num = num + 1; subplot (2, 3, num); SURF (x, y, z); axis ([-3 3-3 3 0 2]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (4 )'); % title % % num = num + 1; subplot (2, 3, num); meshz (x, y, z); axis ([-3 3-3 3 0 2]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (5 )'); % title % % num = num + 1; subplot (2, 3, num); SURF (x, y, z); Hold on; stem3 (X, Y, Z, 'R '); % draw a vertical axis ([-3 3-3 3 0 2]); % limit the display range xlabel ('x' axis '); % x axis coordinate ylabel ('y axis '); % Y axis coordinate zlabel ('z axis'); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (6 )'); % title

 

 

2. Draw a three-dimensional map of the matrix

CLC; clear all; close all; X = [0 1 2 3 4 5 6 7 8 9]; y = [0 1 2 3 4 5 6 7 8 9]; for I = 1: 1: length (x) for j = 1: 1: length (y) Z (I, j) = Mod (I * j * rand (1 ), 9 ); endend % % num = 0; num = num + 1; subplot (2, 3, num); plot3 (x, y, z); axis ([0 9 0 9 0 9]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (1 )'); % title % % num = num + 1; subplot (2, 3, num); mesh (x, y, z); axis ([0 9 0 9 0 9]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (2 )'); % title % % num = num + 1; subplot (2, 3, num); meshc (x, y, z); axis ([0 9 0 9 0 9]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (3 )'); % title % % num = num + 1; subplot (2, 3, num); SURF (x, y, z); axis ([0 9 0 9 0 9]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (4 )'); % title % % num = num + 1; subplot (2, 3, num); meshz (x, y, z); axis ([0 9 0 9 0 9]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis'); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (5 )'); % title % % num = num + 1; subplot (2, 3, num); SURF (x, y, z); Hold on; stem3 (X, Y, Z, 'R '); % draw a vertical axis ([0 9 0 9 0 9]); % limit the display range xlabel ('x axis '); % x axis coordinate ylabel ('y axis '); % Y axis coordinate zlabel ('z axis '); % Z axis coordinate title ('HTTP: // blog.csdn.net/nuptboyzhb/ figure (6)'); % title

 

 

3. color depth of the matrix

A function compiled by myself: graycolor. m

% Filename: graycolor. M % Zheng Haibo 2013-01-31% success! % Parameter: newbuf must make the two-dimensional array or Matrix Function graycolor (newbuf); min_n = min (newbuf); max_n = max (newbuf); newbuf = newbuf. /(max_n-min_n) * 255; [m n] = size (newbuf); for I = 1: 1: m for j = 1: 1: n r (I, j) = graycolorr (newbuf (I, j); G (I, j) = graycolorg (newbuf (I, j); B (I, j) = graycolorb (newbuf (I, j); endendimg (1: 1: M, 1: 1: N, 1) = r (1: M, 1: N ); IMG (1: 1: M, 1: 1: N, 2) = g (1: M, 1: N); IMG (1: 1: M, 1: 1: n, 3) = B (1: M, 1: N); imshow (uint8 (IMG); function r = graycolorr (Gray) r = 0; if gray> = 170 r = 255; endif gray> = 128 & gray <= 170 r = 255/42 * (Gray-128); endreturn; function g = graycolorg (Gray) G = 0; if Gray> = 84 & gray <= 170g = 255; endif gray <= 84g = 255/84 * gray; endif gray> = 170 & gray <= 255g = 255/85 * (255-gray); endreturn; function B = graycolorb (Gray) B = 0; if gray <= 84 B = 255; endif gray> = 84 & gray <= 128 B = 255/44 * (128-gray); endreturn;

 

Function call:

[X, y] = meshgrid (-2: 0.. 0); % generate coordinate axis Z = 2 * X. * exp (-X. ^ 2-y. ^ 2) + 1; % Z is X, the function graycolor (z) of Y; Title ('HTTP: // blog.csdn.net/nuptboyzhb/'); % title

In addition, we will provide a more detailed introduction to the file \ MATLAB 2009a \ toolbox \ MATLAB \ demos \ graf3d. M. The interface is as follows: