Extracting matrix from mat file
5 次查看(过去 30 天)
显示 更早的评论
I am working with 3 matrices of size 997*2160, which has been extracted from available mat file; First two matrices are x and y coordinates and last one data matrix:A. Now I would like to get the data matrix A corresponding to some specific part of x & y matrices. I have checked the range of x matrix that I require and it is (349:589,:), varying vertically and y matrix as (:,1381:1681), varying horizontally. I would require the data matrix A corresponding to these stated range.
I tried this:
x=xmat(349:589,:); % this generated 241*2160
y=ymat(:,1381:1681); % this generated 997*301
A=Amat(349:589,1381:1681); %this generated 241*301
Am I doing in right way? Please suggest if this is not correct. Your help will be very much appreciated.
Best regards,
Sumit G
2 个评论
maiaL
2020-8-11
If you tried that, what did you get as a result/error? At a first glance, it looks plausible to me.
采纳的回答
hosein Javan
2020-8-11
I assume you have an "x" and a "y" rectangular grid point coordinates, and "A" contains "f(x,y)" data. in this case "x" is a row-vector repeated and "y" is a column vector repeated. now you're trying to extract coordinates ranging in these intervals: "349<x<589" and "1381<y<1681". if that is the case, you're code should look like:
idx_x = 349<x & x<589; % index of extracted x values
idx_y = 1381<y & y<1681; % index of extracted x values
x_ext = x(idx_x); % extracted x values
y_ext = x(idx_y); % extracted y values
A_ext = A(idx_x & idx_y) % extracted A values
what you were doing was to unnoticably replace data range by matrix index while they have to be calculated first as was shown.
12 个评论
更多回答(0 个)
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!