Matlab: How to find a point in a bounding box

Question

I have an array of points or locations that are scattered throughout a big matrix, and I have a small bounding box inside the matrix. I need a way to check if the points in the array are within the bounding box. Thanks for your suggestions.

BoundingBox = [BB1,BB2,BB3,BB4];
Array = [x1,y1;x2,y2;x3,y3;x4,y4;x5,y5;x6,y6];

I have tried

ismember([BB1,BB2,BB3,BB4],Array);

and

ismember(rectangle('Position',[BB1,BB2,BB3,BB4]),Array);

but nothing is working

Answer 1

You should read ismember()'s documentation more carefully:

Array elements that are members of set array

So, this check is related to set operations.

Instead, you should use inpolygon() to check whether points are inside a polygon.

Answer 2

Try this:

% Array         an Nx2 matrix containing the X,Y coordinates of the points with
%               respect to the big matrix
%
% BoundingBox   a vector of length 4 representing the bounding box as follows:
%               [minimumX, minimumY, sizeX, sizeY]


isInBox = @(M,B) (M(:,1)>B(1)).*(M(:,1)<B(1)+B(3)).*(M(:,2)>B(2)).*(M(:,2)<B(2)+B(4));
isInBox(Array,BoundingBox);

If you change the strict inequalities to >= and <= you will also accept points on the bounding box.