5 Graph Description Language (GDL) - Absint

For details, see p. 115.
• randomimpulse
Type: integer
Default value: 32
Attribute of: top-level graph
Description:
This attribute only applies to the forcedir layout algorithm.
It specifies the strength of the random impulse vector. If the forcedir algorithm should behave
like a simulated annealing algorithm, this constant should be large and a slow temperature
scheme should be chosen. Otherwise a small value is preferable for the randomimpulse
attribute.
For details, see p. 115.
• randomrounds
Type: integer
Default value: -1
Attribute of: top-level graph
Description:
This attribute only applies to the forcedir layout algorithm.
This attribute specifies the number of randomized rounds during impulse calculation. It
should only be used for the first few rounds so as to add a random impulse. Afterwards, the
random impulse would delay completion of calculation.
For details, see p. 115.
• repulsion
Type: integer
Default value: 60
Attribute of: top-level graph
Description:
This attribute only applies to the forcedir layout algorithm.
Here it is part of the force-directed spring embedder during repulsive impulse calculation. It
specifies the constant that is inversely proportional to the attractive forces acting on a node.
This constant and its attractive counterpart (see attraction on p. 66) enabled the length of
edges to be controlled. Usually the values for these two attributes are of the same order of
magnitude.
For details, see p. 115.
• rmin, rmax
Type: integer
Default value:
0 for rmin
100 for rmax
Attribute of: top-level graph, subgraphs
Description:
82