Array

For example, in

GRAVITY( "simple gravity" ) {
 gravity = { 0, -9.81, 0 }
}

the gravity parameter requires a three-component vector of floating point numbers. This parameter requires exactly three numbers separated by commas. An array may be two dimensional. For example, in

PERIODIC_BOUNDARY_CONDITION( "a PBC" ) {
 rotation_axis = { 0, 0, 0 ; 0, 0, 1 }
}

rotation_axis is defined by two points in space. The axis of rotation is in the z-direction, passing through the points (0,0,0) and (0,0,1). The rows of a two dimensional array are separated by semicolons. In the above example, rotation_axis is a 2x3 array. The array may also have mixed integer and floating point values. For example,

COORDINATE {
 coordinates = { 1, 0.0, 0.0, 0.0 ;
      2, -1.5, -1.5, -1.5 ;
 ... }
}

defines the nodal coordinates of the problem. Here the first column is the node number and columns two, three, and four define the x, y, and z components of the coordinates. The number of columns must be at least four and the number of rows defines the number of nodes in the system. The values of an array may be read from an ASCII file:

COORDINATE {
 coordinates = Read( "channel.crd" )
}

where each line of the file "channel.crd" must contain an integer followed by three floating point numbers separated by white space (one or more spaces or tabs). No commas or semicolons may be embedded in the file. For example, the file "channel.crd" may contain:

1 0.0 0.0 0.0
2 -1.5 -1.5 -1.5
...