MATLAB Function Reference (Volume 2: Graphics)

stream3Purpose2stream3Compute 3-D stream line dataSyntaxDescriptionXYZ = stream3(X,Y,Z,U,V,W,startx,starty,startz)XYZ = stream3(U,V,W,startx,starty,startz)XYZ = stream3(X,Y,Z,U,V,W,startx,starty,startz) computes stream linesfrom vector data U, V, W. The arrays X, Y, Z define the coordinates for U, V, W andmust be monotonic and 3-D plaid (such as the data produced by meshgrid).startx, starty, and startz define the starting positions of the stream lines.The returned value XYZ contains a cell array of vertex arrays.XYZ = stream3(U,V,W,startx,starty,startz) assumes the arrays X, Y, andZ are defined as [X,Y,Z] = meshgrid(1:N,1:M,1:P) where [M,N,P] =size(U).XYZ = stream3(...,options) specifies the options used when creating thestream lines. Define options as a one or two element vector containing the stepsize or the step size and the maximum number of vertices in a stream line:[stepsize]or[stepsize, max_number_vertices]If you do not specify values, MATLAB uses the default:• stepsize = 0.1 (one tenth of a cell)• naximum number of vertices = 1000Use the streamline command to plot the data returned by stream3.ExamplesThis example draws 3-D stream lines from data representing air currents overregions of North America.load wind[sx sy sz] = meshgrid(80,20:10:50,0:5:15);streamline(stream3(x,y,z,u,v,w,sx,sy,sz))view(3)See Alsoconeplot, isosurface, reducevolume smooth3, stream2, streamline,subvolume2-461