Find all y values for single x in polyshape plot

I whould like to somehow get all y values that correspond to a given x.

pgon = polyshape([0 0 1 1],[1 0 0 1])

plot(pgon)

Expected functionality:

y = findYbyX(pgon, 0.2);

Output:

y = [0, 1]

Answer 1

[Jon]

You can use the intersect function for this, for example

pgon = polyshape([0 0 1 1],[1 0 0 1])
endpoints = intersect(pgon,[0.2 0;0.2 10])
y = endpoints(:,2); % just keep the y values of the intersecting line segment

[Yehor Zhyliaiev]

Thanks

[Jon]

Your welcome, glad that this worked for you