Correlation Coefficient in Legend

Hi im new to Matlab, Im having trouble knowing how to display my correlation coefficient on my legend, i tried using : text(x, y, sprintf('R = %.2f', R))

but this does not work because it does not include it in the legend. Also how can I make Matlab not round up my correaltion coefficient number? My correlation coefficient number is: 0.999259 but when it shows up in the graph it rounds up to 1

here is my code :

close all;
clc
hT=[400
  350 
  300 
  250 
  200 
  150 
  100 
  50 ];
 
h2=[64
  56 
  46 
  40 
  30 
  22 
  14 
  4 ];
 
plot(hT,h2,'k.','markersize',16)
axis([0 400 0 70]);
 
%% least square fit
X =[ones(size(hT)),hT];
z=X'*h2;
S=X'*X;
U= chol(S);
w=U'\z;
c=U\w;
q=50:5:400;
fit=c(1)+c(2)*q; % coefficints 
hold on 
plot(q,fit,'b', 'linewidth',1); % linear least square fit 
%%
R= corr(hT,h2)
 
 
title('\Deltah_{1-2} VS \Deltah_{1-T}','BackgroundColor','y')
legend('Data', 'Least square fit')
 
xlabel('\Deltah_{1-T} (mm)')
 
ylabel('\Deltah_{1-2} (mm)')
 
grid on

Answer 1

[Star Strider]

Change the legend call to:

legend('Data', sprintf('Least square fit R = %.2f', R))

.

Answer 2

[VBBV]

Use the sprintf command in legend function just like the text, and include a higher precision specifier for decimals e.g,. 5 for 5 place decimals to avoid roundoff of numbers in legend appearance

close all;
clc
hT=[400
  350 
  300 
  250 
  200 
  150 
  100 
  50 ];
 
h2=[64
  56 
  46 
  40 
  30 
  22 
  14 
  4 ];
 
plot(hT,h2,'k.','markersize',16)
axis([0 400 0 70]);
 
%% least square fit
X =[ones(size(hT)),hT];
z=X'*h2;
S=X'*X;
U= chol(S);
w=U'\z;
c=U\w;
q=50:5:400;
fit=c(1)+c(2)*q; % coefficints 
hold on 
plot(q,fit,'b', 'linewidth',1); % linear least square fit 
%%
R= corr(hT,h2);

R = 0.9993

title('\Deltah_{1-2} VS \Deltah_{1-T}','BackgroundColor','y')
legend('Data', sprintf('Least square fit, R = %0.5f',R))  % use the sprintf command with higher precison specifier 
 
xlabel('\Deltah_{1-T} (mm)')
 
ylabel('\Deltah_{1-2} (mm)')
 
grid on