% setupsnow=450; % number of snow flakes [0 .. 5000]% draw treeh=0:0.2:25; %vertical grid[X,Y,Z] = cylinder(tree(h)); %produce a tree formed cylinderZ=Z*25; %scale to the right heigth%Add some diffusion to the surface of the tree to make it look more realtreeDiffusion=rand(126,21)-0.5;%some horizontal diffusion data%add diffusion to the grid pointsfor cnt1=1:21 for cnt2=16:126%starting above the trunk %get the angle to always diffuse in direction of the radius angle=atan(Y(cnt2,cnt1)/X(cnt2,cnt1)); %split the diffusion in the two coordinates, depending on the angle X(cnt2,cnt1)=X(cnt2,cnt1)+cos(angle)*treeDiffusion(cnt2,cnt1); Y(cnt2,cnt1)=Y(cnt2,cnt1)+sin(angle)*treeDiffusion(cnt2,cnt1); %some Vertical diffusion for each point Z(cnt2,cnt1)=Z(cnt2,cnt1)+(rand-0.5)*0.5; end end%draw the treeh0 = figure('Units','inches');pos = h0.Position;pos(1) = 1; pos(2) = 1;pos(3) = 7; pos(4) = 7;h0.Position = pos;surfl(X,Y,Z,'light')
这是我复制大神的代码，但是我用16版的matlab有错误，然后我把（tree（h））改成（h）就可以运行，但是树是倒过来的，我在想是不是因为版本不同的问题啊！（我真的在计算机方面很菜啊）
你好同学，那是因为tree这个函数是作者自己定的，没在博文中展示出来，你可以去这里下载完整的圣诞树代码
链接：https://pan.baidu.com/s/1KNE9sUM_tzNdSZa81b8gmg 提取码：qmvk
（有帮助记得给个采纳支持一下呢）
其实matlab画圣诞树还有很多方法呢，比如
方法一：旋转的圣诞树
clear, clc, close all
figure, hold on, N = 6^5; c = 50; k = randi(6,c,1); l = randperm(N,c);
q = @(x) rand(N,1); a = q()*2*pi; z = q(); r = .4*(1-z); t = q();
x = r.*cos(a); y = r.*sin(a); P = {'ro','ys','md','b^','kh','c*'};
scatter3(x.*t,y.*t,z,[],[zeros(N,1) (t.*r).^.6 zeros(N,1)],'*')
plot3(0,0,1.05,'rp','markers',12,'markerf','r')
for i = 1:6
L = l(k==i);
plot3(x(L),y(L),z(L),P{i},'markers',8,'linew',2);
end
[X,Y,Z] = cylinder(.025,30);
surf(X,Y,-Z*.1)
view(3, 9), axis equal off
for i = 1:9:c*9, set(gca,'vie',[i, 9]); drawnow, end
方法二：静态圣诞树
% Christmas Tree - static version
% author: Hanchu Wang
% This code is for plotting 2 chirstmas trees based on Conical Spiral
% Function.
% =================================================
% =================================================
close all; clear all; clc
% =================================================
% Color RGB
% =================================================
bl = [ 22, 42, 114]/255;
dg = [ 22, 91, 51]/255;
gr = [ 20, 107, 58]/255;
oy = [248, 178, 41]/255;
or = [234, 70, 48]/255;
rd = [187, 37, 40]/255;
sg = [ 86, 125, 48]/255;
mg = [143, 177, 78]/255;
dy = [249, 243, 85]/255;
% =================================================
% Conical Spiral - Parameters and function
% Equation reference: Weisstein, Eric W. "Conical Spiral." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ConicalSpiral.html
% =================================================
h = 10;
r = h/1.618/2;
a = 100;
fx = @(h,r,a,z) (h-z)./h.*r.*cos(a.*z);
fy = @(h,r,a,z) (h-z)./h.*r.*sin(a.*z);
% =================================================
% Conical Spiral - Parameters and function
% =================================================
mainbody_z = 0:0.01:10;
mainbody_x = fx(h,r,a,mainbody_z);
mainbody_y = fy(h,r,a,mainbody_z);
ball_z=0.1:0.2:10;
ball_x=fx(h,r,a,ball_z);
ball_y=fy(h,r,a,ball_z);
leaf_z1=0.1:0.01:5;
leaf_x1=fx(h,r,a*2,leaf_z1)+0.1;
leaf_y1=fy(h,r,a*2,leaf_z1)+0.1;
stringLight_z=0.1:0.01:10;
stringLight_x=fx(h,r+0.1,a*4,stringLight_z+0.01);
stringLight_y=fy(h,r+0.1,a*4,stringLight_z+0.01);
stringLight2_z=0:0.12:10;
stringLight2_x=fx(h,r,a,stringLight2_z);
stringLight2_y=fy(h,r,a,stringLight2_z);
leaf_z2=0.1:0.015:10;
leaf_x2=fx(h,r,a,leaf_z2+0.01);
leaf_y2=fy(h,r,a,leaf_z2+0.01);
snow=rand(50,3);
snow(:,1:2)=snow(:,1:2).*((4-(-4))+1)+(-4.5);
snow(:,3)=snow(:,3).*(10+1);
snow2=rand(105,3);
snow2(:,1:2)=snow2(:,1:2).*((4-(-4))+1)+(-4.5);
snow2(:,3)=snow2(:,3).*(10+1);
% =================================================
% Plotting
% =================================================
figure (1)
% tree
plot3(mainbody_x,mainbody_y,mainbody_z, '*', 'Color',gr,'LineWidth', 1.5)
hold on
% star
plot3(0,0,h+0.2,'p', 'MarkerSize',28,'MarkerFaceColor',oy, 'MarkerEdgeColor',oy.*0.8, 'LineWidth', 2)
scatter3(0,0,h+0.2,20000, 'w', 'MarkerFaceColor', oy, 'MarkerEdgeAlpha', 0, 'MarkerFaceAlpha', 0.1);
%leaf
plot3(leaf_x1,leaf_y1,leaf_z1,'*','Color', gr);
plot3(leaf_x2,leaf_y2,leaf_z2,'*','Color', sg);
%string lights
plot3(stringLight_x,stringLight_y,stringLight_z,'.', 'Color', dy);
scatter3(stringLight_x,stringLight_y,stringLight_z,900, '.', 'MarkerFaceColor', dy, 'MarkerEdgeColor', dy, 'MarkerEdgeAlpha', 0, 'MarkerFaceAlpha', 0.1);
%balls
plot3(ball_x,ball_y,ball_z, 'o','MarkerSize',10, 'Color',or, 'MarkerFaceColor', or, 'MarkerEdgeColor',rd)
% snow
plot3(snow(:,1),snow(:,2),snow(:,3),'*','Color',[1 1 1])
plot3(snow2(:,1),snow2(:,2),snow2(:,3),'.','Color',[1 1 1], 'MarkerSize',5)
% text
text(2,2,8,{['Merry Christmas']},'HorizontalAlignment','left','FontSize',20,'Color', [1 1 1],'fontname','Britannic Bold');
% =================================================
% Formatting
% =================================================
pbaspect([1 1 1])
xlim([-4.5 4.5])
ylim([-4.5 4.5])
zlim([0 11])
set(gca,'Color',bl*0.2)
set(gcf,'Color','w')
set(gcf, 'Position', [100, 100, 1000, 1000])
hold off
figure (2)
% tree
plot3(mainbody_x,mainbody_y,mainbody_z, '-', 'Color',gr,'LineWidth', 1.5)
hold on
% star
plot3(0,0,h+0.2,'p', 'MarkerSize',28,'MarkerFaceColor',oy, 'MarkerEdgeColor',oy.*0.8, 'LineWidth', 2)
scatter3(0,0,h+0.2,20000, 'w', 'MarkerFaceColor', oy, 'MarkerEdgeAlpha', 0, 'MarkerFaceAlpha', 0.1);
%leaf
plot3(leaf_x1,leaf_y1,leaf_z1,'-','Color', gr);
plot3(leaf_x2,leaf_y2,leaf_z2,'-','Color', sg);
%string lights
plot3(stringLight2_x,stringLight2_y,stringLight2_z,':', 'Color', dy, 'LineWidth', 2);
%balls
plot3(ball_x,ball_y,ball_z, 'o','MarkerSize',10, 'Color',or, 'MarkerFaceColor', or, 'MarkerEdgeColor',rd)
% snow
plot3(snow(:,1),snow(:,2),snow(:,3),'*','Color',[1 1 1])
plot3(snow2(:,1),snow2(:,2),snow2(:,3),'.','Color',[1 1 1], 'MarkerSize',5)
% text
text(2,2,8,{['Merry Christmas']},'HorizontalAlignment','left','FontSize',20,'Color', [1 1 1],'fontname','Britannic Bold');
% =================================================
% Formatting
% =================================================
pbaspect([1 1 1])
xlim([-4.5 4.5])
ylim([-4.5 4.5])
zlim([0 11])
% -------------------------------------------------
% polygon frame
set(gca,'Color',bl*0.2)
set(gcf,'Color','w')
% if wants no frame, use following lines instead
% set(gcf,'Color',bl*0.2)
% -------------------------------------------------
%optional
set(gcf, 'Position', [1000, 100, 1000, 1000])
hold off
% End--------------------------------------------------------------------