How to plot vertical line when hitting the range?
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Chen yuru
on 30 Jul 2019
Commented: Michelle Hirsch
on 14 Apr 2020
Hello, I would like to plot four red lines on the figure.
which is on the edge of yellow block.
But, I don't know how to find and plot it.
Attachment is new.mat , included fx, dy, new value.
The blue blocks are all zero and the yellow blocks are all 1.
Thanks.
![1.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/231822/1.png)
load new.mat
contourf(fx,dy,new,'linestyle','none');
ylabel('Range Cell','FontSize',15,'Fontname','Times');
xlabel('Radial Velocity (m/s)','FontSize',15,'Fontname','Times')
set(gca,'FontSize',15,'Fontname','Times');
2 Comments
KSSV
on 30 Jul 2019
You can insert lines manually or get the points and plot line...this is one of the option.
Accepted Answer
Michael Madelaire
on 30 Jul 2019
%% Init
clear all; close all; clc;
cd 'C:\Users\s144117\Desktop\mathworks'
%% Load
load('new')
%% Find boarders
boarders = [];
for i=2:length(new(:,1))-1
column_before = new(i-1, :);
column = new(i, :);
column_after = new(i+1, :);
flag_before = sum(column_before == 1) > 0;
flag = sum(column == 1) > 0;
flag_after = sum(column_after == 1) > 0;
if flag_before == 0 && flag == 1
boarders = [boarders, i-1];
elseif flag == 1 && flag_after == 0
boarders = [boarders, i+1];
end
end
%% Plot
contourf(fx,dy,new,'linestyle','none');
ylim = get(gca, 'ylim');
hold on;
for i=1:length(boarders)
plot([1,1]*fx(boarders(i)), ylim, '-', 'Color', 'red')
end
ylabel('Range Cell','FontSize',15,'Fontname','Times');
xlabel('Radial Velocity (m/s)','FontSize',15,'Fontname','Times')
set(gca,'FontSize',15,'Fontname','Times');
2 Comments
Michelle Hirsch
on 14 Apr 2020
Here's a small simplification for releases since 18b - you can call xline to draw the vertical lines instead of having to use the clever plot([1,1]* ...) trick.
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