Gridding data set and highlighting selection

Dear all,

I have following data set

X  Y  filename
126.0000 40.0000 TX-130W4
126.5698 40.2369 TX-131W5
127.1396 40.4738 TX-130W6
127.7094 40.7107 TX-132W7
128.2792 40.9476 TX-130W8
128.8490 41.1845 TX-130W9
129.4188 41.4214 TX-130W10
129.9886 41.6583 TX-130W11
130.5584 41.8952 TX-130W12

Now I want to make a grid of lets say 0.05 degrees for X and Y and then highlight the data points on each grid nodes and finally output those node points with XYZ values. The reason I'm doing this I have very big data file which is just like a scattered plot I want to grid that region and select data points on each grid point (lets say 40 (130) then 40.05 (130) 40.1 (130) and so on similarly 126 (40) then 126.05 (40) 126.1(40) and so on). Numbers in brackets are either x-axis or y-axis. Please see the attached figure so the white dots are points I want to output. I will be very grateful if someone could help me in this task.

Thanks

[Walter Roberson]

Note: the data appears to be tab delimited. I change that to spaces in the posting so that it would be readable.

Answer 1

[Muthu Annamalai]

I recommend you to read basic plotting tutorial using MATLAB and use some standard plotting functions like below,

1. plot function http://www.mathworks.com/help/matlab/creating_plots/using-high-level-plotting-functions.html
2. text function http://www.mathworks.com/help/matlab/ref/text.html
3. Tutorial on Graphics system http://www.mathworks.com/help/matlab/graphics.html

 to annotate your graph axis.

I am not able to provide you a canned solution.

HTH