Extracting data from a matrix in slanted rectangular form
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i have data consisting of x, y and z . I want to extract data from the above matrix in a slanted rectangular shape( If I joined the vertex values of rectangles it will be slanted and there are 4 x values and 4 y values ). The image shows the contour of the data I want to extract the data in the rectangle as shown in the figure (Thick bordered).
thank you
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KSSV
2017-2-8
clear all
[X,Y,Z] = peaks(100) ; % data
% the slant rectangle I picked
rect = [
-1.5000 0.1399
-0.2005 1.6968
1.0300 -0.1224
-0.6014 -1.2770
-1.5000 0.1399
] ;
figure ; surf(X,Y,Z) ; view(2) ; hold on ; plot(rect(:,1),rect(:,2),'b') ;
% get the indices of piints which are inside the rectangle
id = inpolygon(X(:),Y(:),rect(:,1),rect(:,2));
% initilaize the required matrices
Xi = NaN(size(X)) ;
Yi = Xi ;
Zi = Xi ;
% fill the values inside rectangle
Xi(id) = X(id) ;
Yi(id) = Y(id) ;
Zi(id) = Z(id) ;
figure ;surf(Xi,Yi,Zi)
4 个评论
Abhilash K S
2017-2-8
Thanks, KSSV . I got it One more question not exactly related to this how can I convert back my matrix to xyz format, the value of z is unique for particular x and y the figure shows the pattern of my data
I need it to convert back to x,y,z format after some processing
KSSV
2017-2-8
If X is a matrix, you can convert it to array x by X(:).
Abhilash K S
2017-2-8
Saurabh Agarwal
2021-7-6
From this inclined matrix (as rectangle is inclined) is getting. How to make a straight matrix from this?
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