Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1993
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1993

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Matrix Operations in Mma

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Re: Matrix Operations in Mma
  • From: beau at vision.arc.nasa.gov (Andrew B. Watson)
  • Date: Wed, 13 Oct 93 10:06:29 PDT

Following up on

>> How can I assign a matrix to a part of another matrix

A crude solution, used in the context of pasting one image into another.
Note that no error checking is done. "point" is the {row,col} coordinates
of the starting point of the insert.


pasteImage[imagesink_,imagesource_,point_List:{1,1}] :=
	Module[{i,rows,cols,irows,icols,row,col},
	{irows,icols} = Dimensions[imagesink];
	{rows,cols} = Dimensions[imagesource];
	{row,col} = point;
	Join[
	 Take[imagesink,row-1],
	 Table[
	  Join[Take[imagesink[[i+row-1]],col-1]
	      ,Take[imagesource[[i]],cols]
	      ,Take[imagesink[[i+row-1]],-(icols-cols-col+1)]]
	 ,{i,rows}],
	Take[imagesink,-(irows-rows-row+1)]]
	]

Andrew B. Watson
MS 262-2 NASA Ames Research Center
Moffett Field CA 94035-1000
(415) 604-5419 -3323 fax
beau at vision.arc.nasa.gov





  • Prev by Date: mathHDF & NeXT
  • Next by Date: Introduction
  • Previous by thread: Matrix Operations in Mma
  • Next by thread: Re: Matrix Operations in Mma