# How to insert arrows at the middle of each of the parallel lines

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In the follwoing I want to insert arrows at the middle of each of the parallel lines

p = 0.01:.05:1;

figure(1)

plot([0; 1],[p; p], 'color','b');

x = [0.3,0.5];

y = [p,p+0.1];

a = annotation('arrow',x,y);

How to do that ? But my code does not work

##### 3 Comments

### Accepted Answer

KSSV
on 8 Jul 2020

Edited: KSSV
on 8 Jul 2020

Why annotation for this? You can use quiver. Play around with the below code.

clc; clear all ;

p = 0.01:.05:1;

x =[0;1] ;

y = [p ;p] ;

x1 = repmat(0.5,1,20);

y1 = p ;

u1 = -0.2*ones(size(y1)) ;

v1 = zeros(size(x1)) ;

figure(1)

hold on

plot(x,y, 'color','b');

quiver(x1,p,u1,v1)

quiver(x1+0.1,p,u1,v1)

##### 3 Comments

KSSV
on 8 Jul 2020

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