stream2 (MATLAB Function Reference)

Compute 2-D stream line 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 stream lines from vector data u and v. The arrays x and y define the coordinates for u and v and must be monotonic and 2-D plaid (such as the data produced by meshgrid). startx and starty define the starting positions of the stream lines. 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 stream lines. 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 stream line:

[stepsize]

[stepsize, max_number_vertices]

If you do not specify a value, MATLAB uses the default:

stepsize = 0.1 (one tenth of a cell)
naximum number of vertices = 1000

Use the streamline command to plot the data returned by stream2.

Examples

This example draws 2-D stream lines 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));