repmat.pro
5.13 KB
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;+
; NAME:
; REPMAT
;
; PURPOSE:
;
; This program replicates a matrix or array in the style of
; the MATLAB RebMat command. The matrix or array is "tiled"
; in some integer number of columns and rows.
;
; AUTHOR:
;
; FANNING SOFTWARE CONSULTING
; David Fanning, Ph.D.
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; CATEGORY:
; Utilities
;
; CALLING SEQUENCE:
;
; tiledMatrix = RepMat(matrix, ncol, nrow)
;
; AUGUMENTS:
;
; matix: The matrix or array to be tiled.
;
; ncol: The number of columns in the tile.
;
; nrow: The number of rows in the tile.
;
; RETURN_VALUE:
;
; tiledMatrix: If (xdim,ydim) is the size of the original 2D matrix, then the
; output matrix is sized (ncol*xdim, nrow*ydim).
;
; KEYWORDS:
;
; None.
;
; EXAMPLE:
;
; IDL> matrix = Reform(Indgen(6) + 1, 3, 2)
; IDL> Print, matrix, FORMAT='(3I3)'
; 1 2 3
; 4 5 6
; IDL> Print, RepMat(matrix, 3, 2), FORMAT='(9I3)'
; 1 2 3 1 2 3 1 2 3
; 4 5 6 4 5 6 4 5 6
; 1 2 3 1 2 3 1 2 3
; 4 5 6 4 5 6 4 5 6
;
; MODIFICATION HISTORY:
;
; Written by David W. Fanning, 8 May 2009.
; Algorithm significantly improved by Ronn Kling, 4 August 2009.
; Added line to handle an input matrix with a trailing 1 dimension correctly. DJ 8 March 2011.
;-
;******************************************************************************************;
; Copyright (c) 2009, by Fanning Software Consulting, Inc. ;
; All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
FUNCTION RepMat, matrix, ncol, nrow
; On error, return to caller.
ON_ERROR, 2
; Check parameters.
IF N_Elements(matrix) EQ 0 THEN Message, 'Must pass an array or matrix to replicate.'
IF N_Params() EQ 2 THEN nrow = ncol ; Number of columns and rows is the same.
IF N_Elements(ncol) EQ 0 THEN ncol = 1
IF N_Elements(nrow) EQ 0 THEN nrow = 1
s = Size(matrix, /DIMENSIONS)
IF N_Elements(s) EQ 1 THEN s = [s,1] ; Handle the case of a vector being passed in
; Create array.
array = Make_Array(s[0]*ncol, s[1]*nrow, TYPE=Size(matrix,/TYPE))
array[0,0] = matrix
; Replicate rows first.
IF nrow GT 1 THEN BEGIN
FOR nrow=1,nrow-1 DO $
array[0,nrow*s[1]] = matrix
ENDIF
; Replicate columns next.
IF ncol GT 1 THEN BEGIN
rmatrix = array[0:s[0]-1,*]
FOR ncol=1,ncol-1 DO $
array[(ncol*s[0]),0] = rmatrix
ENDIF
RETURN, array
END