stream2
Compute 2-D streamline data
Syntax
XY = stream2(x,y,u,v,startx,starty)
XY = stream2(u,v,startx,starty)
XY = stream2(...,options)
Description
XY = stream2(x,y,u,v,startx,starty)
computes streamlines from vector data u and v.
The arrays x and y, which
define the coordinates for u and v,
must be monotonic, but do not need to be uniformly spaced. x and y must
have the same number of elements, as if produced by meshgrid.
startx and starty define the starting positions of the
streamlines.
The returned value XY contains a cell array
of vertex arrays.
XY = stream2(u,v,startx,starty)
assumes the arrays x and y are
defined as [x,y] = meshgrid(1:n,1:m) where [m,n]
= size(u).
XY = stream2(...,options)
specifies the options used when creating the streamlines. Define options as
a one- or two-element vector containing the step size or the step
size and the maximum number of vertices in a streamline:
[stepsize]
or
[stepsize, max_number_vertices]
If you do not specify a value, MATLAB® software uses the default:
Step size = 0.1 (one tenth of a cell)
Maximum number of vertices = 10000
Use the streamline command
to plot the data returned by stream2.
Examples
Plot 2-D Streamlines
Plot 2-D streamlines from data representing air currents over regions of North America.
load wind
[sx,sy] = meshgrid(80,20:10:50);
streamline(stream2(x(:,:,5),y(:,:,5),u(:,:,5),v(:,:,5),sx,sy));