Selecting one side of xy data points

Hi all,

i have 2 shapes represnted as a series of x,y data points see represntative picture

im trying to measure beteen the upper surface of the red shape and the lower side of the blue defined shape,

the data points are completly random and ive got a lot to compare apporx 2000.

i can create a line of evenly spaced data points around each shape, so the next part im struggling is making sure im only measuring between the top and bottom. i need to measure at several incrumentas but im struggling to think of the correct logic.

any ideas

many thanks tim

[Rik]

Do you already have the list of coordinates of the lower edge of the blue object and the upper edge of the red object?

[tim pearce]

Hi sorry yes the 2 shapes are stored in separate matrix’s I can share the actual shape but I’ll put together a representative example

Answer 1

[Chunru]

You can use inpolygon to test if the dot is in red shape or blue shape:

doc inpolygon