stream3

Load the wind data set which contains measurements of air current over regions of North America.

Define the starting position of 16 hypothetical particles. In this case, the particles all start at x = 80 and have starting y positions ranging from 20 to 50 and starting z positions ranging from 0 to 15.

load wind
[startX,startY,startZ] = meshgrid(80,20:10:50,0:5:15);

Compute the 3-D streamline vertex data for a hypothetical particle placed into the air current at the collection of starting positions in startX, startY, and startZ.

verts = stream3(x,y,z,u,v,w,startX,startY,startZ);

Visualize the 3-D volume of vector fields with streamline. Return the line objects in the variable lineobj, so you can change their properties later.

lineobj = streamline(verts);
view(3)

To change aspects of a particular line, set properties on one of the returned line objects. For example, change the color of the tenth line to green and change its thickness to 3.

lineobj(10).Color = "g";
lineobj(10).LineWidth = 3;

Load the wind data set, which contains measurements of air current over regions of North America.

Define the starting position of 16 hypothetical particles. In this case, the particles all start at x = 80 and have starting y positions ranging from 20 to 50 and starting z positions ranging from 0 to 15.

load wind
[startX,startY,startZ] = meshgrid(80,20:10:50,0:5:15);

Decrease the streamline resolution by increasing the step size from the default of 0.1 to 3.

step = 3;

Compute the 3-D streamline vertex data for a hypothetical particle placed into the air current at the collection of starting positions in startX, startY, and startZ.

verts = stream3(x,y,z,u,v,w,startX,startY,startZ,step);

Visualize the 3-D volume of vector fields with streamline. The larger step size results in a lower resolution streamline.

streamline(verts)
view(3)

Load the wind data set, which contains measurements of air current over regions of North America.

Define the starting position of 16 hypothetical particles. In this case, the particles all start at x = 80 and have starting y positions ranging from 20 to 50 and starting z positions ranging from 0 to 15.

load wind
[startX,startY,startZ] = meshgrid(80,20:10:50,0:5:15);

Increase the streamline resolution by decreasing the step size from the default of 0.1 to 0.01.

step = 0.01;

Set the maximum number of vertices so that computation ends after the first 1,000 vertices are calculated.

maxvert = 1000;

Compute the 3-D streamline vertex data for a hypothetical particle placed into the air current at the collection of starting positions in startX, startY, and startZ.

verts = stream3(x,y,z,u,v,w,startX,startY,startZ,[step maxvert]);

Visualize the 3-D volume of vector fields with streamline. Show the full range of data values by setting the axis limits. The streamlines end after 1,000 vertices are calculated, so the streamlines stop before showing the full range of data.

streamline(verts)
xlim([75 135])
ylim([15 65])
zlim([0 15])
view(3)