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Keywords

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ARROWSIZE

Size of arrowheads (default = 0.05).

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BLOB

Set this keyword to draw a blob at the beginning of each flow line and suppress the arrows.

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LEN

Length of each step used to follow flow lines (default = 2.0). Expressed in units of largest field vector (i.e., the length of the longest step is set to len times the grid spacing.

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NSTEPS

Number of steps used to follow the flow lines (default = largest dimension of *
Vx*
/ 5).

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NVECS

Number of random flow lines to draw (default = 200). Only used if Sx, Sy, Sz are not present.

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SX,
SY,
SZ

Optional vectors containing the starting coordinates of the flow lines. If omitted random starting points are chosen.

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Example

Create a set of random three-dimensional arrays to represent the field:

vx = RANDOMU(seed, 5, 5, 5)

vy = RANDOMU(seed, 5, 5, 5)

vz = RANDOMU(seed, 5, 5, 5)

Set up the 3D scaling system:

SCALE3, xr=[0,4], yr=[0,4], zr = [0,4]

Plot the vector field:

FLOW3, vx, vy, vz