grid data

white heart · May 4, 2010, 07:06

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.

DoHander · May 4, 2010, 07:34

Hello,

you need to use some interpolation formula, do you have structured Cartesian grids ?

Do

white heart · May 4, 2010, 08:00

Yes I have structured Cartesian grids.

DoHander · May 4, 2010, 08:07

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

white heart · May 4, 2010, 10:05

Thank you very much Do for your help.

May 4, 2010, 07:06	grid data	#1
white heart New Member Join Date: Apr 2010 Posts: 5 Rep Power: 16	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.

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May 4, 2010, 07:34		#2
DoHander Senior Member Join Date: Nov 2009 Posts: 411 Rep Power: 20	Hello, you need to use some interpolation formula, do you have structured Cartesian grids ? Do

May 4, 2010, 08:00		#3
white heart New Member Join Date: Apr 2010 Posts: 5 Rep Power: 16	Yes I have structured Cartesian grids.

May 4, 2010, 08:07		#4
DoHander Senior Member Join Date: Nov 2009 Posts: 411 Rep Power: 20	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, 10:05		#5
white heart New Member Join Date: Apr 2010 Posts: 5 Rep Power: 16	Thank you very much Do for your help.