Help with writing a simple Matlab program

[BrCo]

Hello all,
I am just beginning with Matlab programming, and I would really appreciate your help in creating the following program:

1. first I need to import a text file with 1024x1024 integer numbers (representing pixel intensities in an image), and put this in a matrix.
2. for each number (=pixel) in the matrix, I need to compare that number to its 8 nighbours (the number above it, below it, to its left etc.) and determine which of the 8 neighbors has the highest value.
3. compute the angle from each number to its highest-value neighbor (for example, if the highest-value neighbor is the one above the number, then the angle is 0 degrees. The number below is 180 degrees, the number to the left is 270 degrees, etc.)

Thanks a lot in advance!

 

[VisiGoth]

Make sure you text file is white space delimited and a single column or a regular 1024 X 1024 structure. In MATLAB you run a nonlinear 3X3 around using a double loop. use "find" with a max( center - all else ) for the relative index. Store the value and the coordinate in individual matices. Use a map to convert the coordinate to the angle, don't bother to do a calculation.