matlab 绘图

意思就是把那个实体图加一个圆柱框。

怎么在那个实体图的基础上加一个圆柱框呀？？？

期待你的回复

再次先谢谢了

在此谢谢了

[r,t]=meshgrid(0:.025:sqrt(3),pi*(0:.1:2));
x=r.*cos(t);
y=r.*sin(t);
z1=(4-r.^2).^(1/2);
z2=r.^2/3;
surf(x,y,z1);
hold on
应该是这个程序，上面的那些最后一行删除即可。

听别人说三维极坐标，你们怎么看？？

function [Xout, Yout, Zout] = polar3d(Zin,theta_min,theta_max,Rho_min,Rho_max,meshscale,varargin)
if (nargin < 6)
disp('Polar3d Error: Too few input arguments.');
return
elseif (nargin > 8)
disp('Polar3d Error: Too many input arguments.');
return
end
[p,q] = size(theta_min);
if (((p ~= 1)|(q ~= 1))|~isreal(theta_min))|ischar(theta_min)
disp('Polar3d Error: theta_min must be scalar and real.');
return
end
[p,q] = size(theta_max);
if (((p ~= 1)|(q ~= 1))|~isreal(theta_max))|ischar(theta_max)
disp('Polar3d Error: theta_max must be scalar and real.');
return
end
if theta_max <= theta_min
disp('Polar3d Error: theta_max less than or equal theta_min.');
return
end
if abs(theta_max - theta_min) > 2*pi
disp('Polar3d Error: range of theta greater than 2pi.');
return
end
[p,q] = size(Rho_max);
if (((p ~= 1)|(q ~= 1))|~isreal(Rho_max))|(ischar(Rho_max)|Rho_max < 0)
disp('Polar3d Error: Rho_max must be scalar, positive and real.');
return
end
[p,q] = size(Rho_min);
if (((p ~= 1)|(q ~= 1))|~isreal(Rho_min))|(ischar(Rho_min)|Rho_min < 0)
disp('Polar3d Error: Rho_min must be scalar, positive and real.');
return
end
if Rho_max <= Rho_min
disp('Polar3d Error: Rho_max less than or equal Rho_min.');
return
end
[p,q] = size(meshscale);
if (((p ~= 1)|(q ~= 1))|~isreal(meshscale))|ischar(meshscale)
disp('Polar3d Warning: mesh scale must be scalar and real.');
meshscale = 1;
end
if (meshscale <= 0)
disp('Polar3d Warning: mesh scale must be scalar and positive.');
meshscale = 1;
end
% Set up default plot and interpolation specifications.
str1 = 'mesh';
str2 = 'linear';
if length(varargin) == 2
% Sort out plot and interpolation specification if both strings given.
str1 = [varargin{1}(:)]';
str2 = [varargin{2}(:)]';
g1 = (~isequal(str1,'mesh')&~isequal(str1,'surf'))&~isequal(str1,'off');
g2 = (~isequal(str1,'meshc')&~isequal(str1,'surfc'));
g5 = (~isequal(str1,'contour')&~isequal(str1,'meshl'));
g3 = (~isequal(str2,'cubic')&~isequal(str2,'linear'));
g4 = (~isequal(str2,'spline')&~isequal(str2,'nearest'));
if (g1&g2&g5)
disp('Polar3d Warning: Incorrect plot specification. Default to mesh plot.');
str1 = 'mesh';
end
if (g3&g4)
disp('Polar3d Warning: Incorrect interpolation specification.');
disp('Default to linear interpolation.');
str2 = 'linear';
end
elseif length(varargin) == 1
% Sort out plot or interpolation specification from single string input.
str1 = [varargin{1}(:)]';
g1 = (~isequal(str1,'mesh')&~isequal(str1,'surf'))&~isequal(str1,'off');
g2 = (~isequal(str1,'meshc')&~isequal(str1,'surfc'));
g5 = (~isequal(str1,'contour')&~isequal(str1,'meshl'));
g3 = (~isequal(str1,'cubic')&~isequal(str1,'linear'));
g4 = (~isequal(str1,'spline')&~isequal(str1,'nearest'));
if (g1&g2)&(g3&g4&g5)
disp('Polar3d Error: Incorrect plot or interpolation specification.');
return
elseif isequal(str1,'cubic')
str2 = str1;
str1 = 'mesh';
elseif isequal(str1,'linear')
str2 = str1;
str1 = 'mesh';
elseif isequal(str1,'spline')
str2 = str1;
str1 = 'mesh';
elseif isequal(str1,'nearest')
str2 = str1;
str1 = 'mesh';
elseif isequal(str1,'off')
str2 = 'linear';
end
end;
% Check if dimensions of input data are acceptable.
[r,c] = size(Zin');
if (r < 5)&(c < 5)
disp('Polar3d Error: Input matrix dimensions must be greater than (4 x 4).');
return
end
% Check if input data has two rows or columns or less.
if (r < 3)|(c < 3)
disp('Polar3d Error: One or more input matrix dimensions too small.');
return
end
% Transpose and setup input magnitude matrix.
temp = Zin';
for j = 1:c
P(:,j) = temp(:,c-j+1); % swap columns over
end
Zin = P;
[r,c] = size(Zin);
% Check if meshscale is compatible with dimensions of input data.
scalefactor = round(max(r,c)/meshscale);
if scalefactor < 3
disp('Polar3d Error: mesh scale incompatible with dimensions of input data.');
return
end
% Set up meshgrid corresponding to larger matrix dimension of Zin
% for interpolation if required.
if ~isequal(str1,'meshl')
n = meshscale;
if r > c
L = r;
L2 = fix(L/n)*n;
step = r/(c-1);
[X1,Y1] = meshgrid(0:step:r,1:r);
if n < 1
[X,Y] = meshgrid(0:n:(L2-n),0:n:(L2-n));
else
[X,Y] = meshgrid(1:n:L2,1:n:L2);
end
T = interp2(X1,Y1,Zin,X,Y,str2);
elseif c > r
L = c;
L2 = fix(L/n)*n;
step = c/(r-1);
[X1,Y1] = meshgrid(1:c,0:step:c);
if n < 1
[X,Y] = meshgrid(0:n:(L2-n),0:n:(L2-n));
else
[X,Y] = meshgrid(1:n:L2,1:n:L2);
end
T = interp2(X1,Y1,Zin,X,Y,str2);
else
L = r;
L2 = fix(L/n)*n;
[X1,Y1] = meshgrid(1:r,1:r);
if n < 1
[X,Y] = meshgrid(0:n:(L2-n),0:n:(L2-n));
else
[X,Y] = meshgrid(1:n:L2,1:n:L2);
end
T = interp2(X1,Y1,Zin,X,Y,str2);
end
[p,q] = size(T);
L2 = max(p,q);
% Set up angles
angl = theta_min:abs(theta_max-theta_min)/(L2-1):theta_max;
for j = 1:L2
theta(j,:) = ones([1 L2])*angl(j);
end
% Set up radial components
Rho = Rho_min:abs(Rho_max-Rho_min)/(L2-1):Rho_max;
% Convert to Cartesian coordinates
for j = 1:L2
[Xout(j,:) Yout(j,:) Zout(j,:)] = pol2cart(theta(j,:),Rho,T(j,:));
end
end %if str1 ~= 'meshl'
% Plot Cartesian surface
switch str1;
case 'mesh'
colormap('default');
mesh(Xout,Yout,Zout);
axis on;
grid on;
case 'meshc'
colormap([0 0 0]);
meshc(Xout,Yout,Zout);
axis on;
grid on;
case 'surf'
surf(Xout,Yout,Zout);
axis on;
grid on;
case 'surfc'
surfc(Xout,Yout,Zout);
axis on;
grid on;
hold off
case 'contour'
axis equal;
h = polar([theta_min theta_max], [Rho_min Rho_max]);
delete(h)
hold on
contour(Xout,Yout,Zout,20);
hold off
colorbar;
case 'meshl'
% Set up mesh plot with polar axes and labels
angl = theta_min:abs(theta_max-theta_min)/(r-1):theta_max;
Rho = ones([1 c])*Rho_max*1.005;
X = Rho'*cos(angl);
Y = Rho'*sin(angl);
Z = zeros(size(X));
% set up output data - this is exactly the same as the input
Rho = Rho_min:abs(Rho_max-Rho_min)/(c-1):Rho_max;
Xout = Rho'*cos(angl);
Yout = Rho'*sin(angl);
Zout = Zin';
% plot the data
axis equal;
mesh(Xout,Yout,Zout);
hold on
% plot the axis
mesh(X,Y,Z,'edgecolor',[0 0 0]);
hold on;
% set up tic mark and labels
ticangle = round(theta_min*18/pi)*pi/18:pi/18:round(theta_max*18/pi)*pi/18;
ticlength = [Rho_max*1.005 Rho_max*1.03];
Xtic = ticlength'*cos(ticangle);
Ytic = ticlength'*sin(ticangle);
Ztic = zeros(size(Xtic));
Xlbl = Rho_max*1.1*cos(ticangle);
Ylbl = Rho_max*1.1*sin(ticangle);
Zlbl = zeros(size(Xlbl));
line(Xtic,Ytic,Ztic,'Color',[0 0 0]);
if abs(theta_min-theta_max)==2*pi
Ntext = round(length(ticangle)/2)-1;
else
Ntext = round(length(ticangle)/2);
end
for i = 1:Ntext
text(Xlbl(2*i-1),Ylbl(2*i-1),Zlbl(2*i-1),...
num2str(ticangle(2*i-1)*180/pi),...
'horizontalalignment','center')
end
set(gca,'DataAspectRatio',[1 1 1])
axis off;
grid off;
end
return

还有人能给点思路吗？、