Finding index between two parallel lines
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Hello,
I have bathymetry data (an intuition is attached here) which is stored in a regular 10m-resolution grid with the following limits:
- In the x-axis: xmin:10:xmax. This contains 3039 columns
- In the y-axis: ymin:10:ymax. This forms 1195 rows
- The depth is Z matrix whose size is equal to 1195x 3039;
And I have 2 parallel lines crossing this bathymetry with the following information:
- Line 1 is defined as points (x1,y1) and (x2,y2)
- Line 2 is defined as points (x3,y3) and (x4,y4)
My task is to find indices between these two lines. Could you please help to solve this?
Many thanks
T
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/207678/image.png)
2 Comments
Star Strider
on 10 Mar 2019
‘My task is to find indices between these two lines.’
‘Index’ means different things in different contexts (e.g. matrix, book, etc.). How do you define it here?
Accepted Answer
darova
on 10 Mar 2019
You can use inpolygon
clc, clear
xmin = 50;
xmax = 551;
ymin = -35;
ymax = -800;
y1 = ymax + 150;
y4 = ymin - 150;
k_up = (y1 - ymin)/(xmax-xmin);
k_down = (ymax - y4)/(xmax-xmin);
cla, hold on
for x = xmin:10:xmax
y_start = ceil(y1 - x*k_up);
y_end = floor(ymax - x*k_down);
for y = y_start:-10:y_end
plot(x,y,'.r')
end
end
hold off
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