Location and size of the annotation shape, specified as an M-by-3
or M-by-4 matrix. When you specify a rectangle,
the position input matrix must be an M-by-4 matrix.
Each row, M, specifies a rectangle as a four-element
vector, [x y width height].
The elements, x and y, indicate
the upper-left corner of the rectangle, and the width and height specify
the size.
When you specify a circle, the position input matrix must be
an M-by-3 matrix, where each row, M,
specifies a three-element vector [x y r].
The elements, x and y, indicate
the center of the circle and r specifies the radius.
Example: position = [50 120 75 75]
A rectangle with top-left corner located at x=50, y=120,
with a width and height of 75 pixels.
Example: position = [96 146 31]
A circle with center located at x=96, y=146
and a radius of 31 pixels.
Example: position = [23 373 60 66;35 185 77 81;77 107
59 26]
Location and size for three rectangles.