grid data

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 May 4, 2010, 06:06 grid data #1 New Member   Join Date: Apr 2010 Posts: 5 Rep Power: 7 I have grid data in two dimensions A(0:99,0:99). I want to work on a similar grid data but in a big size ,i.e., A(0:100,0:100), how can I make the extension? I done the following but not sure if it is right: do 12 i=0,99 do 12 j=0,99 12 a(i,j)=a(i,j) do 13 i=0,99 13 a(i,100)=a(i,0) do 14 j=0,99 14 a(100,j)=a(0,j) a(100,100)=a(0,0) Please help me if I am in a wrong way. Thanks.

 May 4, 2010, 06:34 #2 Senior Member   Join Date: Nov 2009 Posts: 411 Rep Power: 10 Hello, you need to use some interpolation formula, do you have structured Cartesian grids ? Do

 May 4, 2010, 07:00 #3 New Member   Join Date: Apr 2010 Posts: 5 Rep Power: 7 Yes I have structured Cartesian grids.

 May 4, 2010, 07:07 #4 Senior Member   Join Date: Nov 2009 Posts: 411 Rep Power: 10 You are lucky, you can use a built in Matlab function to interpolate between your grids: http://www.mathworks.com/access/help...f/interp2.html If you don't have a Matlab license you can use Octave (which is an Open Source Matlab replacement and works on all major operating systems and it is free): http://www.gnu.org/software/octave/d...rpolation.html Or possible Fortran: http://people.sc.fsu.edu/~burkardt/f...al/alscal.html Hope this will help, Do

 May 4, 2010, 09:05 #5 New Member   Join Date: Apr 2010 Posts: 5 Rep Power: 7 Thank you very much Do for your help.

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