MATLAB Answers

Finding the outline of part of a matrix

3 views (last 30 days)
Claire on 17 Apr 2013
I have a 2D matrix of latitude and longitude coordinates that I have used to create a mask. The mask is comprised of NaNs and 1s, depending on if the grid box is included in my mask.
What I want to do is find the coordinates of the boundary of this mask, so that I can plot a line around the shape designated by the 1s.
For example:
NaN 1 1 NaN 1
NaN 1 1 1 1
NaN NaN NaN 1 NaN
How do I draw a line around the shape seen in the 1s, and save the coordinates of this line so that I can overlay it in other plots?
I've tried using contour, but it gives diagonal lines, where I only want horizontal or vertical lines.
I found this thread but I wasn't able to follow the solution.
Any help would be greatly appreciated.
  1 Comment
the cyclist
the cyclist on 17 Apr 2013
What, precisely, do you want the output to be, when the input is the matrix you gave us?

Sign in to comment.

Answers (0)


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by