Help with coneplot function
in [Matlab]
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From: landon donovan on 19 Jun 2010 00:04 Hi folks, i want to plot a 3D vector field. The vectors are stored in an 2D array. also the starting points are stored in an array. I decided to use "coneplot" but the problem is, that i have no clue how to use it... command line: coneplot(X,Y,Z,U,V,W,Cx,Cy,Cz) U,V,W has to be a 3D vector according to the manual. i dont get it. what does it mean. I am somehow not able (probably too stupid) to adapt the example to my needs. would be nice if you could help me greetings
From: us on 19 Jun 2010 00:15 "landon donovan" <lutobu(a)gmail.com> wrote in message <hvhfk6$7bq$1(a)fred.mathworks.com>... > Hi folks, > > i want to plot a 3D vector field. The vectors are stored in > an 2D array. also the starting points are stored in an > array. I decided to use "coneplot" but the problem is, that > i have no clue how to use it... > > command line: coneplot(X,Y,Z,U,V,W,Cx,Cy,Cz) > > U,V,W has to be a 3D vector according to the manual. i dont > get it. what does it mean. I am somehow not able (probably > too stupid) to adapt the example to my needs. > > would be nice if you could help me > > greetings you must provide a small example of what you have and what you want to get... us
From: TideMan on 19 Jun 2010 01:22 On Jun 19, 4:04 pm, "landon donovan" <lut...(a)gmail.com> wrote: > Hi folks, > > i want to plot a 3D vector field. The vectors are stored in > an 2D array. also the starting points are stored in an > array. I decided to use "coneplot" but the problem is, that > i have no clue how to use it... > > command line: coneplot(X,Y,Z,U,V,W,Cx,Cy,Cz) > > U,V,W has to be a 3D vector according to the manual. i dont > get it. what does it mean. I am somehow not able (probably > too stupid) to adapt the example to my needs. > > would be nice if you could help me > > greetings Have you tried this: help coneplot You have a 3-D vector field and you cannot figure out what U,V,W are? Well, I have to agree with your parenthetic statement.
From: landon donovan on 19 Jun 2010 20:59 ok if you want to help me and if you CAN help me: I have the next function to plot with arrows that show the direction of the plot in 3d: function [h1,h2] = directedplot3(x,c,y,d,varargin) col=varargin if nargin < 4, d = []; end if isempty(d), d = 2; end if isvector(y), y = y(:); end if isvector(c), c = c(:); end [m,n] = size(y); if isvector(x) x = x(:); x = x(:,ones(1,n)) end k = 2:d:m; x0 = x(k-1,:) y0 = y(k-1,:) c0 = c(1:length(y0)) % u=gradient(x0); % v=gradient(y0); u = x(k,:) - x0 v = y(k,:) - y0 w = zeros(length(v),1) h1 = plot3(x,c,y,varargin{:}); % % [x0,c0,y0]=meshgrid(x0,c0,y0) % % [u,v,w]=meshgrid(u,v,w) % % xmin = min(x0(:)); % % xmax = max(x0(:)); % % ymin = min(c0(:)); % % ymax = max(c0(:)); % % zmin = min(y0(:)); % % xrange = linspace(xmin,xmax,16); % % yrange = linspace(ymin,ymax,16); % % zrange = 3:4:15; % % [cx cy cz] = meshgrid(xrange,yrange,zrange); hold on h2 = quiver3(x0,c0,y0,u,w,v,0.001,'Color',varargin{:},'MaxHeadSize',0.0001); %%%h2 = coneplot(x0,c0,y0,u,w,v,5,'nointerp','quiver')%,'Color',varargin{:}); hold on %set(h2,'Color',varargin{:}) %hold off I tried to adapt the directedplot function in 2d to 3d but I get very big arrows (in spite I set a MaxHeadSize of almost 0)and when i try to plot many graphs in the same figure I get an overloaded and very ugly plot. As you people can see, i rather tried to draw the arrows as cones using coneplot, but I get an error and thats why I commented that part in this code. PLEASE, ANYBODY, could you help me to draw this arrows correctly so I can get a good directed plot in 3D, or coneplot?
From: abcd on 22 Jun 2010 21:09
ok US thank you for nothing |