Usage

vtkArrayCalculator performs operations on vectors or scalars
in field data arrays. It uses vtkFunctionParser to do the
parsing and to evaluate the function for each entry in the
input arrays. The arrays used in a given function must be
all in point data or all in cell data. The resulting array
will be stored as a field data array. The result array can
either be stored in a new array or it can overwrite an
existing array.
The functions that this array calculator understands is:

   standard operations: + - * / ^ .
   build unit vectors: iHat, jHat, kHat (ie (1,0,0),
  (0,1,0), (0,0,1))
   abs
   acos
   asin
   atan
   ceil
   cos
   cosh
   exp
   floor
   log
   mag
   min
   max
   norm
   sign
   sin
   sinh
   sqrt
   tan
   tanh

Note that some of these operations work on scalars, some on
vectors, and some on both (e.g., you can multiply a scalar
times a vector). The operations are performed tuple-wise
(i.e., tuple-by-tuple). The user must specify which arrays
to use as vectors and/or scalars, and the name of the output
data array.
To create an instance of class vtkArrayCalculator, simply
invoke its constructor as follows

    obj = vtkArrayCalculator



 Methods

The class vtkArrayCalculator has several methods that can be
used. They are listed below. Note that the documentation is
translated automatically from the VTK sources, and may not
be completely intelligible. When in doubt, consult the VTK
website. In the methods listed below, obj is an instance of
the vtkArrayCalculator class.

* string = obj.GetClassName ()
* int = obj.IsA (string name)
* vtkArrayCalculator = obj.NewInstance ()
* vtkArrayCalculator = obj.SafeDownCast (vtkObject o)
* obj.SetFunction (string function) - Set/Get the function
  to be evaluated.
* string = obj.GetFunction () - Set/Get the function to be
  evaluated.
* obj.AddScalarArrayName (string arrayName, int component) -
  Add an array name to the list of arrays used in the
  function and specify which components of the array to use
  in evaluating the function. The array name must match the
  name in the function. Use AddScalarVariable or
  AddVectorVariable to use a variable name different from
  the array name.
* obj.AddVectorArrayName (string arrayName, int component0,
  int component1, int component2) - Add an array name to the
  list of arrays used in the function and specify which
  components of the array to use in evaluating the function.
  The array name must match the name in the function. Use
  AddScalarVariable or AddVectorVariable to use a variable
  name different from the array name.
* obj.AddScalarVariable (string variableName, string
  arrayName, int component) - Add a variable name, a
  corresponding array name, and which components of the
  array to use.
* obj.AddVectorVariable (string variableName, string
  arrayName, int component0, int component1, int component2)
  - Add a variable name, a corresponding array name, and
  which components of the array to use.
* obj.AddCoordinateScalarVariable (string variableName, int
  component) - Add a variable name, a corresponding array
  name, and which components of the array to use.
* obj.AddCoordinateVectorVariable (string variableName, int
  component0, int component1, int component2) - Add a
  variable name, a corresponding array name, and which
  components of the array to use.
* obj.SetResultArrayName (string name) - Set the name of the
  array in which to store the result of evaluating this
  function. If this is the name of an existing array, that
  array will be overwritten. Otherwise a new array will be
  created with the specified name.
* string = obj.GetResultArrayName () - Set the name of the
  array in which to store the result of evaluating this
  function. If this is the name of an existing array, that
  array will be overwritten. Otherwise a new array will be
  created with the specified name.
* int = obj.GetResultArrayType () - Type of the result
  array. It is ignored if CoordinateResults is true. Initial
  value is VTK_DOUBLE.
* obj.SetResultArrayType (int ) - Type of the result array.
  It is ignored if CoordinateResults is true. Initial value
  is VTK_DOUBLE.
* int = obj.GetCoordinateResults () - Set whether to output
  results as coordinates. ResultArrayName will be ignored.
  Outputing as coordinates is only valid with vector results
  and if the AttributeMode is AttributeModeToUsePointData.
  If a valid output can't be made, an error will occur.
* obj.SetCoordinateResults (int ) - Set whether to output
  results as coordinates. ResultArrayName will be ignored.
  Outputing as coordinates is only valid with vector results
  and if the AttributeMode is AttributeModeToUsePointData.
  If a valid output can't be made, an error will occur.
* obj.CoordinateResultsOn () - Set whether to output results
  as coordinates. ResultArrayName will be ignored. Outputing
  as coordinates is only valid with vector results and if
  the AttributeMode is AttributeModeToUsePointData. If a
  valid output can't be made, an error will occur.
* obj.CoordinateResultsOff () - Set whether to output
  results as coordinates. ResultArrayName will be ignored.
  Outputing as coordinates is only valid with vector results
  and if the AttributeMode is AttributeModeToUsePointData.
  If a valid output can't be made, an error will occur.
* obj.SetAttributeMode (int ) - Control whether the filter
  operates on point data or cell data. By default
  (AttributeModeToDefault), the filter uses point data.
  Alternatively you can explicitly set the filter to use
  point data (AttributeModeToUsePointData) or cell data
  (AttributeModeToUseCellData). For graphs you can set the
  filter to use vertex data (AttributeModeToUseVertexData)
  or edge data (AttributeModeToUseEdgeData).
* int = obj.GetAttributeMode () - Control whether the filter
  operates on point data or cell data. By default
  (AttributeModeToDefault), the filter uses point data.
  Alternatively you can explicitly set the filter to use
  point data (AttributeModeToUsePointData) or cell data
  (AttributeModeToUseCellData). For graphs you can set the
  filter to use vertex data (AttributeModeToUseVertexData)
  or edge data (AttributeModeToUseEdgeData).
* obj.SetAttributeModeToDefault () - Control whether the
  filter operates on point data or cell data. By default
  (AttributeModeToDefault), the filter uses point data.
  Alternatively you can explicitly set the filter to use
  point data (AttributeModeToUsePointData) or cell data
  (AttributeModeToUseCellData). For graphs you can set the
  filter to use vertex data (AttributeModeToUseVertexData)
  or edge data (AttributeModeToUseEdgeData).
* obj.SetAttributeModeToUsePointData () - Control whether
  the filter operates on point data or cell data. By default
  (AttributeModeToDefault), the filter uses point data.
  Alternatively you can explicitly set the filter to use
  point data (AttributeModeToUsePointData) or cell data
  (AttributeModeToUseCellData). For graphs you can set the
  filter to use vertex data (AttributeModeToUseVertexData)
  or edge data (AttributeModeToUseEdgeData).
* obj.SetAttributeModeToUseCellData () - Control whether the
  filter operates on point data or cell data. By default
  (AttributeModeToDefault), the filter uses point data.
  Alternatively you can explicitly set the filter to use
  point data (AttributeModeToUsePointData) or cell data
  (AttributeModeToUseCellData). For graphs you can set the
  filter to use vertex data (AttributeModeToUseVertexData)
  or edge data (AttributeModeToUseEdgeData).
* obj.SetAttributeModeToUseVertexData () - Control whether
  the filter operates on point data or cell data. By default
  (AttributeModeToDefault), the filter uses point data.
  Alternatively you can explicitly set the filter to use
  point data (AttributeModeToUsePointData) or cell data
  (AttributeModeToUseCellData). For graphs you can set the
  filter to use vertex data (AttributeModeToUseVertexData)
  or edge data (AttributeModeToUseEdgeData).
* obj.SetAttributeModeToUseEdgeData () - Control whether the
  filter operates on point data or cell data. By default
  (AttributeModeToDefault), the filter uses point data.
  Alternatively you can explicitly set the filter to use
  point data (AttributeModeToUsePointData) or cell data
  (AttributeModeToUseCellData). For graphs you can set the
  filter to use vertex data (AttributeModeToUseVertexData)
  or edge data (AttributeModeToUseEdgeData).
* string = obj.GetAttributeModeAsString () - Control whether
  the filter operates on point data or cell data. By default
  (AttributeModeToDefault), the filter uses point data.
  Alternatively you can explicitly set the filter to use
  point data (AttributeModeToUsePointData) or cell data
  (AttributeModeToUseCellData). For graphs you can set the
  filter to use vertex data (AttributeModeToUseVertexData)
  or edge data (AttributeModeToUseEdgeData).
* obj.RemoveAllVariables () - Remove all the variable names
  and their associated array names.
* obj.RemoveScalarVariables () - Remove all the scalar
  variable names and their associated array names.
* obj.RemoveVectorVariables () - Remove all the scalar
  variable names and their associated array names.
* obj.RemoveCoordinateScalarVariables () - Remove all the
  coordinate variables.
* obj.RemoveCoordinateVectorVariables () - Remove all the
  coordinate variables.
* string = obj.GetScalarArrayName (int i) - Methods to get
  information about the current variables.
* string = obj.GetVectorArrayName (int i) - Methods to get
  information about the current variables.
* string = obj.GetScalarVariableName (int i) - Methods to
  get information about the current variables.
* string = obj.GetVectorVariableName (int i) - Methods to
  get information about the current variables.
* int = obj.GetSelectedScalarComponent (int i) - Methods to
  get information about the current variables.
* int = obj.GetNumberOfScalarArrays () - Methods to get
  information about the current variables.
* int = obj.GetNumberOfVectorArrays () - Methods to get
  information about the current variables.
* obj.SetReplaceInvalidValues (int ) - When
  ReplaceInvalidValues is on, all invalid values (such as
  sqrt(-2), note that function parser does not handle
  complex numbers) will be replaced by ReplacementValue.
  Otherwise an error will be reported
* int = obj.GetReplaceInvalidValues () - When
  ReplaceInvalidValues is on, all invalid values (such as
  sqrt(-2), note that function parser does not handle
  complex numbers) will be replaced by ReplacementValue.
  Otherwise an error will be reported
* obj.ReplaceInvalidValuesOn () - When ReplaceInvalidValues
  is on, all invalid values (such as sqrt(-2), note that
  function parser does not handle complex numbers) will be
  replaced by ReplacementValue. Otherwise an error will be
  reported
* obj.ReplaceInvalidValuesOff () - When ReplaceInvalidValues
  is on, all invalid values (such as sqrt(-2), note that
  function parser does not handle complex numbers) will be
  replaced by ReplacementValue. Otherwise an error will be
  reported
* obj.SetReplacementValue (double ) - When
  ReplaceInvalidValues is on, all invalid values (such as
  sqrt(-2), note that function parser does not handle
  complex numbers) will be replaced by ReplacementValue.
  Otherwise an error will be reported
* double = obj.GetReplacementValue () - When
  ReplaceInvalidValues is on, all invalid values (such as
  sqrt(-2), note that function parser does not handle
  complex numbers) will be replaced by ReplacementValue.
  Otherwise an error will be reported


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