Selecting data within a particular shape from a matrix.
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I want to select data around point [169,547] in the attached v variable. Attached is the figure of the shape in which I want the coordinate values, their distance and angle with respect to the center point [169,547]. The case represents a dynamic crack which moves forward in the next frame and thus the center position will change in the next frame and the whole process will be repeated again. Any guidance regarding the implementation would be great.
Matt J on 31 Aug 2019
Edited: Matt J on 31 Aug 2019
As an example,
xc=547; yc=169; %center coordinates
rint=10; rext=50; %internal and external radii
[X,Y]=meshgrid((1:size(v,2))-xc, (1:size(v,1))-yc );
crack= Y<=rint & Y>=-rint & X<=sqrt(rint^2-Y.^2);
region= X.^2+Y.^2<=rext^2 & ~crack;
selected_data = v(region);