How to name point on plot?

Hello, I have to plot some points in a graphic. I know that I can mark the points with 'o' or with 'x', but can I rename the points that I plot? For example A1, A2 ecc.

This is my program and how I plot my points.

clear all
close all
clc


a1=1;
b1=1;
a2=2;
b2=0.5;
a3=3;
b3=1.5;
a4=2;
b4=2;
p0=2.1;
q0=0.6;
r0=1.5;
p1=2;
q1=2;


sol(:) = fsolve(@(x)funzmia6(x), 1:8);
s0=sol(1);
r1=sol(2);
s1=sol(3);
vxp0=[p0,p1];
vyq0=[q0,q1];
vxr0=[r0,r1];
vys0=[s0,s1];
vxpr=[p1,r1];
vyqs=[q1,s1];
vx00=[p0,r0];
vy00=[q0,s0];


figure;
hold on
plot(p0,q0,'o')
plot(p1,q1,'o')
plot(r0,s0,'o')
plot(r1,s1,'o')
plot(vxp0,vyq0)
plot(vxr0,vys0)
plot(vxpr,vyqs)
plot(vx00,vy00)
plot(a1,b1,'x')
plot(a2,b2,'x')
plot(a3,b3,'x')
plot(a4,b4,'x')
grid on





function F=funzmia6(x)
s0=x(1);
r1=x(2);
s1=x(3);
theta12=x(4);
theta13=x(5);
theta14=x(6);
L2=x(7);
L4=x(8);


a1=1;
b1=1;
a2=2;
b2=0.5;
a3=3;
b3=1.5;
a4=2;
b4=2;
p0=2.1;
q0=0.6;
r0=1.5;
p1=2.184;
q1=2.184;





F(1)=p1*p0+q1*q0-a2*p0-b2*q0-a1*p1-b1*q1+(a1^2+b1^2+a2^2+b2^2)/2+cos(theta12)*(-p0*p1-q0*q1+a1*p0+b1*q0-a1*a2-b1*b2+a2*p1+b2*q1)+sin(theta12)*(p1*q1-q0*p1-b1*p0+a1*q0+a2*b1-a1*b2+b2*p1-a2*q1);
F(2)=p1*p0+q1*q0-a3*p0-b3*q0-a1*p1-b1*q1+(a1^2+b1^2+a3^2+b3^2)/2+cos(theta13)*(-p0*p1-q0*q1+a1*p0+b1*q0-a1*a3-b1*b3+a3*p1+b3*q1)+sin(theta13)*(p1*q1-q0*p1-b1*p0+a1*q0+a3*b1-a1*b3+b3*p1-a3*q1);
F(3)=p1*p0+q1*q0-a4*p0-b4*q0-a1*p1-b1*q1+(a1^2+b1^2+a4^2+b4^2)/2+cos(theta14)*(-p0*p1-q0*q1+a1*p0+b1*q0-a1*a4-b1*b4+a4*p1+b4*q1)+sin(theta14)*(p1*q1-q0*p1-b1*p0+a1*q0+a4*b1-a1*b4+b4*p1-a4*q1);
F(4)=r1*r0+s1*s0-a2*r0-b2*s0-a1*r1-b1*s1+(a1^2+b1^2+a2^2+b2^2)/2+cos(theta12)*(-r0*r1-s0*s1+a1*r0+b1*s0-a1*a2-b1*b2+a2*r1+b2*s1)+sin(theta12)*(r1*s1-s0*r1-b1*r0+a1*s0+a2*b1-a1*b2+b2*r1-a2*s1);
F(5)=r1*r0+s1*s0-a3*r0-b3*s0-a1*r1-b1*s1+(a1^2+b1^2+a3^2+b3^2)/2+cos(theta13)*(-r0*r1-s0*s1+a1*r0+b1*s0-a1*a3-b1*b3+a3*r1+b3*s1)+sin(theta13)*(r1*s1-s0*r1-b1*r0+a1*s0+a3*b1-a1*b3+b3*r1-a3*s1);
F(6)=r1*r0+s1*s0-a4*r0-b4*s0-a1*r1-b1*s1+(a1^2+b1^2+a4^2+b4^2)/2+cos(theta14)*(-r0*r1-s0*s1+a1*r0+b1*s0-a1*a4-b1*b4+a4*r1+b4*s1)+sin(theta14)*(r1*s1-s0*r1-b1*r0+a1*s0+a4*b1-a1*b4+b4*r1-a4*s1);
F(7)=(p1-p0)^2+(q1-q0)^2 -L2^2;
F(8)=(r1-r0)^2+(s1-s0)^2 -L4^2;

end

Answer 1

[KALYAN ACHARJYA]

text(x,y,txt)

x,y represent the data point, see detail here

[Federico MegaMan]

Perfect, I resolve it. Thank you very much.

[Yashita]

I tried doing this but this makes the label of the point appear at a random location, how do i make it so that is visible right beside the point i want to name?

[DGM]

You need to specify the location and configure it to be aligned however you want it aligned..

% some fake data and a plot
xv = linspace(0,1,20);
yv = xv.^1; % change the exponent and watch the text follow
plot(xv,yv,'-o')

% place text next to point #3 using defaults
ht(1) = text(xv(3),yv(3),'Billy');

% place text next to point #5, but change the horizontal alignment
ht(2) = text(xv(5),yv(5),'Bobby','horizontalalignment','right');

% place text next to point #7, but change the rotation
ht(3) = text(xv(7),yv(7),'Larry','rotation',-45);

% place text next to point #9, but change the vertical alignment
ht(4) = text(xv(9),yv(9),'Moe','verticalalignment','top');

% place text next to point #11, but change the alignment and add an extra offset
ht(5) = text(xv(11),yv(11),'Curly','verticalalignment','top');
ht(5).Position(1:2) = ht(5).Position(1:2) + [0.01 -0.01]; % shift SE

See also:

https://www.mathworks.com/help/matlab/ref/text.html

https://www.mathworks.com/help/matlab/ref/matlab.graphics.primitive.text-properties.html

... and possibly:

https://www.mathworks.com/help/matlab/ref/annotation.html