Obtaining width of section along a line in contour plot
6 views (last 30 days)
Show older comments
I use ginput to select a hanful of points on a contour plot, created from xyz data. Now I want to create a vector that e.g. starts at the first point selected and ends at the second point and covers all the points on the route. It would be easy if the selection were always a diagonal matrix but in non-diagonal cases the line usually cuts through two adjacent elements of a row (or column). As stated above I can click on two points of a contour plot to obtain the indices using ginput and the corresponding z values. What I need now is the the maximum z value occurring along the red line and the width of the area under the selected line (red line in picture below).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/166664/image.png)
0 Comments
Answers (1)
KSSV
on 11 Aug 2017
As you have (x,y) of the red line in hand, use interp2 to get the corresponding z values....to get area use trapz.
2 Comments
KSSV
on 11 Aug 2017
If your point lie's exactly on the given point..you will get what you want...if it is deviated, it will be interpolated....still..if you are particular....you can use knnsearch to get nearest neighbour and extract that pixel.
See Also
Categories
Find more on Visual Exploration in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!