color in quiver
in [Matlab]
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From: Lisette de Boer on 10 Jan 2010 08:50 Hallo, I'm simulating fish schooling in matlab, using quiver3. I would like to make the color of the arrow dependent on the size of the fish. I've made a matrix with for every fish i with lenght L(i) determines color(i) (if L(i)<0.5 color(i)='b'; etc) how do I know plot this using quiver3? I've tried multiple things, but nothing seems to work. Thanks in advance! Lisette
From: us on 10 Jan 2010 16:54 "Lisette de Boer" <lisettede_boer(a)hotmail.com> wrote in message <hiclud$fce$1(a)fred.mathworks.com>... > Hallo, > > I'm simulating fish schooling in matlab, using quiver3. I would like to make the color of the arrow dependent on the size of the fish. I've made a matrix with for every fish i with lenght L(i) determines color(i) > (if L(i)<0.5 > color(i)='b'; > > etc) > > how do I know plot this using quiver3? I've tried multiple things, but nothing seems to work. > > Thanks in advance! > > Lisette one of the solutions % the data % - modified from HELP QUIVER3 [x,y]=meshgrid(-2:.5:2,-2:.5:2); z=x .*exp(-x.^2-y.^2); [u,v,w]=surfnorm(x,y,z); % the engine tf=u<0; % <- color is different for U<0 and U>=0 % the result quiver3(x(tf),y(tf),z(tf),u(tf),v(tf),w(tf),'color',[1,0,0],'linewidth',.5); hold on; tf=~tf; quiver3(x(tf),y(tf),z(tf),u(tf),v(tf),w(tf),'color',[0,1,0],'linewidth',1); surf(x,y,z); colormap(bone); us
From: Lisette de Boer on 11 Jan 2010 06:37 "us " <us(a)neurol.unizh.ch> wrote in message <hidi9r$fh8$1(a)fred.mathworks.com>... > "Lisette de Boer" <lisettede_boer(a)hotmail.com> wrote in message <hiclud$fce$1(a)fred.mathworks.com>... > > Hallo, > > > > I'm simulating fish schooling in matlab, using quiver3. I would like to make the color of the arrow dependent on the size of the fish. I've made a matrix with for every fish i with lenght L(i) determines color(i) > > (if L(i)<0.5 > > color(i)='b'; > > > > etc) > > > > how do I know plot this using quiver3? I've tried multiple things, but nothing seems to work. > > > > Thanks in advance! > > > > Lisette > > one of the solutions > > % the data > % - modified from HELP QUIVER3 > [x,y]=meshgrid(-2:.5:2,-2:.5:2); > z=x .*exp(-x.^2-y.^2); > [u,v,w]=surfnorm(x,y,z); > % the engine > tf=u<0; % <- color is different for U<0 and U>=0 > % the result > quiver3(x(tf),y(tf),z(tf),u(tf),v(tf),w(tf),'color',[1,0,0],'linewidth',.5); > hold on; > tf=~tf; > quiver3(x(tf),y(tf),z(tf),u(tf),v(tf),w(tf),'color',[0,1,0],'linewidth',1); > surf(x,y,z); > colormap(bone); > > us I think my problem is a bit different, since i want to plot different colors at the same time. I've tried this, but i don't get an output then. Is it possible to determine the color first, and than use this vector in quiver? thanks
From: us on 11 Jan 2010 07:48 "Lisette de Boer" <lisettede_boer(a)hotmail.com> wrote in message <hif2gv$gg2$1(a)fred.mathworks.com>... > "us " <us(a)neurol.unizh.ch> wrote in message <hidi9r$fh8$1(a)fred.mathworks.com>... > > "Lisette de Boer" <lisettede_boer(a)hotmail.com> wrote in message <hiclud$fce$1(a)fred.mathworks.com>... > > > Hallo, > > > > > > I'm simulating fish schooling in matlab, using quiver3. I would like to make the color of the arrow dependent on the size of the fish. I've made a matrix with for every fish i with lenght L(i) determines color(i) > > > (if L(i)<0.5 > > > color(i)='b'; > > > > > > etc) > > > > > > how do I know plot this using quiver3? I've tried multiple things, but nothing seems to work. > > > > > > Thanks in advance! > > > > > > Lisette > > > > one of the solutions > > > > % the data > > % - modified from HELP QUIVER3 > > [x,y]=meshgrid(-2:.5:2,-2:.5:2); > > z=x .*exp(-x.^2-y.^2); > > [u,v,w]=surfnorm(x,y,z); > > % the engine > > tf=u<0; % <- color is different for U<0 and U>=0 > > % the result > > quiver3(x(tf),y(tf),z(tf),u(tf),v(tf),w(tf),'color',[1,0,0],'linewidth',.5); > > hold on; > > tf=~tf; > > quiver3(x(tf),y(tf),z(tf),u(tf),v(tf),w(tf),'color',[0,1,0],'linewidth',1); > > surf(x,y,z); > > colormap(bone); > > > > us > > I think my problem is a bit different, since i want to plot different colors at the same time. I've tried this, but i don't get an output then. > > Is it possible to determine the color first, and than use this vector in quiver? > > thanks well, this works - and should do what you need... did you copy/paste the snippet(?)... did it yield an output(?)... if(f) so: what does not work for you(?)... us
From: Lisette de Boer on 11 Jan 2010 08:26
> well, this works - and should do what you need... > did you copy/paste the snippet(?)... > did it yield an output(?)... > if(f) so: what does not work for you(?)... > > us Hi, I did something wrong but now it works. One more question; how do I do this if i want more than 2 colors, so i want to make the distinction between L<0, 0<L<0.5 and 0.5<L<1? thanks again! |