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<< Click to Display Table of Contents >> Predefined Elements |
  
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<< Click to Display Table of Contents >> Predefined Elements |
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The problem descriptor language predefines the following elements :
PI |
3.14159265358979 |
For Cartesian coordinates in which 'R' is not specified as a coordinate name or a defined name, the problem descriptor language predefines the following elements:
R |
R=SQRT(x^2 + y^2)
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radius vector length in 2D |
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R=SQRT(x^2 + y^2 + z^2)
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radius vector length in 3D |
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THETA |
THETA = ARCTAN(y/x)
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azimuthal angle in 2D or 3D |
Note: If "R" or "Theta" appear on the left side of a definition before any use in an expression, then the new definition will become the meaning of the name, and the predefined meaning will be hidden.
In all problems,
CELL_SIZE |
an internally declared value representing the size of the current evaluation cell. |
CURRENT_DIRECTORY |
a string representation of the command-line current working directory. (Established at execution time - will not change if command line changes directory.) |
In staged problems where "STAGES = integer" is declared in the SELECT section,
STAGE |
an internally declared index which increments from 1 to integer. |
In modal analysis (eigenvalue and eigenfunction) problems where "MODES = integer" is declared in the SELECT section,
LAMBDA |
an internally declared name which represents the various eigenvalues. |
In time-dependent problems, the current timestep interval is available:
DELTAT |
an internally declared name which returns the size of the current timestep. |