uk.ac.starlink.ast
Class PermMap
java.lang.Object
uk.ac.starlink.ast.AstObject
uk.ac.starlink.ast.Mapping
uk.ac.starlink.ast.PermMap
public class PermMap
- extends Mapping
Java interface to the AST PermMap class
- coordinate permutation Mapping.
A PermMap is a Mapping which permutes the order of coordinates,
and possibly also changes the number of coordinates, between its
input and output.
In addition to permuting the coordinate order, a PermMap may
also assign constant values to coordinates. This is useful when
the number of coordinates is being increased as it allows fixed
values to be assigned to any new ones.
Licence
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public Licence as
published by the Free Software Foundation; either version 2 of
the Licence, or (at your option) any later version.
This program is distributed in the hope that it will be
useful,but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public Licence for more details.
You should have received a copy of the GNU General Public Licence
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street,Fifth Floor, Boston, MA
02110-1301, USA
- See Also:
- AST PermMap
Constructor Summary |
PermMap(int nin,
int[] inperm,
int nout,
int[] outperm,
double[] constant)
Creates a PermMap. |
Methods inherited from class uk.ac.starlink.ast.Mapping |
decompose, getInvert, getNin, getNout, getReport, getTranForward, getTranInverse, invert, linearApprox, mapBox, mapSplit, rate, rebin, rebinD, rebinF, rebinI, resample, resampleB, resampleD, resampleF, resampleI, resampleL, resampleS, setInvert, setReport, simplify, tran1, tran2, tranGrid, tranN, tranP |
Methods inherited from class uk.ac.starlink.ast.AstObject |
annul, clear, copy, delete, equals, finalize, getAstConstantI, getB, getC, getD, getF, getI, getID, getIdent, getL, getNobject, getObjSize, getRefCount, hashCode, isThreaded, reportVersions, sameObject, set, setB, setC, setD, setF, setI, setID, setIdent, setL, show, test, tune |
PermMap
public PermMap(int nin,
int[] inperm,
int nout,
int[] outperm,
double[] constant)
- Creates a PermMap.
- Parameters:
nin
- The number of input coordinates.inperm
- An optional array with "nin" elements which, for each input
coordinate, should contain the number of the output
coordinate whose value is to be used (note that this array
therefore defines the inverse coordinate transformation).
Coordinates are numbered starting from 1.
For details of additional special values that may be used in
this array, see the description of the "constant" parameter.
If a NULL pointer is supplied instead of an array, each input
coordinate will obtain its value from the corresponding
output coordinate (or will be assigned the value AST__BAD if
there is no corresponding output coordinate).
nout
- The number of output coordinates.outperm
- An optional array with "nout" elements which, for each output
coordinate, should contain the number of the input coordinate
whose value is to be used (note that this array therefore
defines the forward coordinate transformation). Coordinates
are numbered starting from 1.
For details of additional special values that may be used in
this array, see the description of the "constant" parameter.
If a NULL pointer is supplied instead of an array, each output
coordinate will obtain its value from the corresponding
input coordinate (or will be assigned the value AST__BAD if
there is no corresponding input coordinate).
constant
- An optional array containing values which may be assigned to
input and/or output coordinates instead of deriving them
from other coordinate values. If either of the "inperm" or
"outperm" arrays contains a negative value, it is used to
address this "constant" array (such that -1 addresses the
first element, -2 addresses the second element, etc.) and the
value obtained is used as the corresponding coordinate value.
Care should be taken to ensure that locations lying outside
the extent of this array are not accidentally addressed. The
array is not used if the "inperm" and "outperm" arrays do not
contain negative values.
If a NULL pointer is supplied instead of an array, the
behaviour is as if the array were of infinite length and
filled with the value AST__BAD.
- Throws:
AstException
- if an error occurred in the AST library
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