How to show regression line over my plot?

I have made scatter plot using the command below.

aa=scatter(MERRA_combined(:),MISR_combined(:))
   xlim([0 1])
   ylim([0 1])
xlabel('MERRA 2')
ylabel('MISR')
title('Aerosol Optical Depth')

I wish to add regression line to this plot. I have attached the variables.

Answer 1

[KSSV]

doc lsline

Or..use the below code:

load x_axis.mat ;
load y-axis.mat ;
aa=scatter(MERRA_combined(:),MISR_combined(:)) ;
xlim([0 1])
ylim([0 1])
xlabel('MERRA 2')
ylabel('MISR')
title('Aerosol Optical Depth')
%%fit line 
x = MERRA_combined(:) ;
y = MISR_combined(:) ;
% remove NaN's from y
x(isnan(y)) = [] ;
y(isnan(y)) = [] ;
P = polyfit(x,y,1);
%
x0 = min(x) ; x1 = max(x) ;
xi = linspace(x0,x1) ;
yi = P(1)*xi+P(2);
hold on
plot(xi,yi,'r') ;

[Pritha Pande]

Thank you. It worked.

[Pritha Pande]

One more thing,how to add 1:1 line in the same plot?

[KSSV]

What do you mean by 1:1 line?