The Principal Component Analysis operation can be directly executed by typing one of the following expressions on the command line of the Main Window:
OUTMATRIX |
= |
MatrixPrincComp(InputMaplist) |
OUTMATRIX |
= |
MatrixPrincComp(InputMaplist, nr of output bands) |
where:
OUTMATRIX |
is the name of the output matrix; the output map list will obtain the same name; the output raster maps also use this name followed by _1, _2, _3, etc. |
MatrixPrincComp |
is the command to start the Principal Components operation. |
InputMaplist |
is the name of the input map list; all raster maps in the input map list must use the Image domain or the same value domain, and have the same georeference. If you like you can also define a map list on the fly as: mlist(map1, map2, ...) where mlist is fixed syntax to define a temporary map list without name, and where map1, map2 etc. are the names of the raster maps that should be part of the map list. |
nr of output bands |
is an optional parameter to specify the number of desired output bands (1 <= integer value <= nr of input bands). If not specified, the same number of output bands will be defined as found in the input map list. |
When the definition symbol = is used:
OUTMAPLIST |
= |
MapListMatrixMultiply(InputMapList, OUTMATRIX, nr of output maps) |
When the assignment symbol := is used:
The dependent raster maps of the dependent output map list will only be calculated when the map list is opened, e.g. by double-clicking the map list in a Catalog.
See also: